OBD-II Code P1705: Transmission Range Sensor Circuit Malfunction

What Does P1705 Mean?

P1705 means the engine computer (ECM) or transmission computer (TCM) is not receiving a valid gear selection signal (Park, Reverse, Neutral, Drive). This signal originates from the Transmission Range Sensor (TRS), also known as a Neutral Safety Switch. Without this data, the engine refuses to start, and the transmission cannot shift correctly, creating severe drivability hazards.

Technical definition: The official definition of P1705 varies by manufacturer. For GM, Ford, and Honda, it indicates a circuit malfunction or invalid signal from the Transmission Range Sensor (TRS). For Nissan and Infiniti, it means the Transmission Control Module (TCM) lost the throttle position signal from the Engine Control Module (ECM) via the CAN bus. For older Toyotas, it points to a Direct Clutch Speed Sensor circuit fault.

Can I Drive With P1705?

No — Do Not Drive. Driving is not recommended. The vehicle often fails to start, stalls, or shifts erratically, creating a significant safety risk. The transmission frequently enters 'limp mode,' locking into a single gear. Prolonged driving in limp mode strains clutch packs and internal components, leading to catastrophic transmission failure with repair costs exceeding $1,000. Drive only a short distance to a repair shop, avoiding highways.

Common Causes

• Faulty Transmission Range Sensor (TRS) (Very Common) — This is the primary cause. 🎬 Watch: How to replace a Ford transmission range sensor The sensor wears out internally, its electrical contacts burn out, or it fails electronically, preventing it from sending the correct gear position signal.
• Damaged Wiring or Corroded Connectors (Common) — Heat and vibration fray, break, or short the wires leading to the TRS. The electrical connector also corrodes from moisture or fluid contamination, blocking the signal.
• Misadjusted Transmission Range Sensor or Shifter Linkage (Common) — A misaligned sensor or stretched shifter cable reports a gear position that contradicts the physical shifter. This frequently occurs after transmission repairs or if the linkage loosens.
• Faulty Throttle Position Sensor (TPS) or Circuit (Common On Specific Makes) — On Nissan and Infiniti models, this code triggers when the TCM loses the throttle position signal required to determine shift points. This stems from a faulty TPS, damaged wiring, or a CAN bus communication error.
• Poorly Installed Aftermarket Electronics (Less Common) — Improperly installed aftermarket remote starters or alarm systems cause this code, especially on Hondas. Tapping into the transmission range switch circuit creates a short or signal conflict.
• Low or Dirty Transmission Fluid (Less Common) — Low fluid levels on GM and Mitsubishi models drop hydraulic pressure, interfering with sensor operation and triggering the fault.
• Corroded or Loose Body Grounds (Less Common) — Corroded main body or engine ground connections create electrical interference on the CAN bus, disrupting the signal between the ECM and TCM.
• Malfunctioning Shift Solenoid (Rare) — On older Subaru models, an internal transmission shift solenoid (like the 2-4 brake timing solenoid) fails and triggers P1705.
• Faulty Control Module (TCM, ECM, or IPDM) (Rare) — The Transmission Control Module (TCM), Engine Control Module (ECM), or Nissan's Intelligent Power Distribution Module (IPDM) fails to process the signal. Check this only after eliminating all other possibilities.

Symptoms

• Engine Refuses to Crank in Park or Neutral — The computer blocks the engine from cranking as a safety measure because it believes the car is in gear, even when the shifter is in Park or Neutral.
• Transmission is in 'Limp Mode' — The transmission locks into a single gear (usually 2nd or 3rd) to prevent internal damage, resulting in poor acceleration and high RPMs at highway speeds.
• Incorrect or Flashing Gear Display — The dashboard gear indicator (PRNDL) shows the wrong gear, goes blank, or flashes a specific gear light (like 'D'), indicating a communication failure.
• Erratic or Harsh Shifting — The transmission shifts at the wrong times, slams into gear, or hesitates because it lacks accurate gear position data.
• Poor Acceleration or Surging RPMs — On Nissan/Infiniti models, losing the throttle position signal causes the engine to bog down, surge unexpectedly, or jerk during acceleration.
• Check Engine Light is On (also visible on scanner) — The computer detects a fault and stores the P1705 code. A dedicated transmission warning light also illuminates on some models.

Diagnostic Flowchart

Tap your situation to follow the diagnostic path that matches what you're seeing on this code.

Common Fixes & Costs

• Replace Transmission Range Sensor (TRS) — Parts: $50-$250, Labor: $150-$350, ~2 hr book time (Intermediate)
• Repair Damaged Wiring or Connector — Parts: $10-$50, Labor: $100-$500, ~2.5 hr book time (Intermediate)
• Replace Throttle Position Sensor (TPS) — Parts: $40-$150, Labor: $75-$150, ~1 hr book time (DIY)
• Adjust Shifter Linkage / Cable — Parts: $0-$20, Labor: $75-$200, ~1.5 hr book time (Professional)
• Clean or Replace Ground Connections — Parts: $5-$20, Labor: $50-$150, ~0.8 hr book time (DIY)
• Reset or Reprogram Control Module — Parts: $0, Labor: $100-$300, ~1 hr book time (Professional)

Used vs. New Parts: Buying Guide

When a used part is worth it: Buying a used Transmission Range Sensor rarely makes sense. It is an electronic wear-and-tear item with an unknown history. The minimal savings do not justify the high risk of premature failure.

Donor-vehicle mileage cap: roughly under 40000 miles for the part to have meaningful remaining life.

Donor quality checklist:

• Only consider a used sensor from a very low-mileage vehicle scrapped for reasons unrelated to the transmission.
• Ensure the part number is an exact match.
• Avoid parts from regions where road salt is common.

Decision logic:

• If The cost of a new OEM or reputable aftermarket sensor is less than the cost of labor for one replacement → Always buy new. The warranty and reliability far outweigh the small savings of a used part.
• If The vehicle is very old and has low value, and you are doing the labor yourself → A used part from a trusted salvage yard is a justifiable gamble, but still not recommended.

Warranty tradeoff: Used sensors typically have a 30-90 day warranty, which does not cover labor costs. New aftermarket parts carry a 1-year to limited lifetime warranty, while new OEM parts guarantee compatibility.

Worst-case if a used part fails: $250-$500 if the used part fails shortly after installation, requiring you to pay for labor again plus a new part.

What Happens If You Wait — Timeline

1. 0-2 weeks: Check Engine Light is on. Vehicle experiences intermittent no-start conditions. Shifting remains mostly normal. (MPG impact: 0-2%% · Added cost: $0-$250 (Potential towing cost))
2. 2 weeks - 3 months: Harsh or erratic shifting becomes frequent. Transmission unexpectedly enters 'limp mode' (stuck in 2nd or 3rd gear). No-start issues worsen. (MPG impact: 5-15%% · Added cost: $50-$200 in wasted fuel due to inefficient operation.)
3. 3-8 months: Driving consistently in limp mode causes transmission fluid to overheat, accelerating wear on clutch packs and internal seals. The vehicle is unsafe in traffic. (MPG impact: 15-25%% · Added cost: $800-$2,000 (Damage to valve body, solenoids, or clutch packs becomes likely).)
4. 8+ months: Catastrophic internal transmission failure. Prolonged operation with incorrect line pressure and extreme heat leads to widespread mechanical breakdown requiring a complete rebuild. (MPG impact: N/A (Vehicle is likely undrivable)% · Added cost: $2,500-$5,000+)

Cost of Not Fixing It

• Immediate: Significant safety risk. The vehicle fails to start or shifts erratically, causing a sudden loss of power in traffic. (Added cost: $100-$250 (Towing))
• 1-6 Months: Increased strain on transmission components. Driving in limp mode overheats the transmission fluid and puts excessive wear on clutch packs. (Added cost: $800-$2000 (Valve body repair, solenoid replacement))
• 6+ Months: Catastrophic transmission failure. Prolonged stress and overheating leads to a complete internal breakdown, requiring a full transmission rebuild. (Added cost: $2500-$5000+)

Diagnosis Steps

1. Verify the Code and Check for Others
   Use an OBD-II scanner to confirm P1705. Note any other codes. P0700 is a general transmission fault, P0705 is the generic TRS fault, and U1000 on a Nissan points to a CAN communication issue that is likely the root cause.
   Tools: OBD-II Scanner (Beginner)
2. Test Shifter and Startup Logic
   Try starting the engine in both Park and Neutral. Wiggle the shifter while holding the key in the 'start' position. Intermittent starting strongly suggests a misadjusted or failing Transmission Range Sensor.
   Tools: None (Beginner)
3. Monitor Live Sensor Data
   Use a scanner with live data to watch the TRS signal while slowly moving the shifter through each gear (P, R, N, D, L). The scanner reading must match the shifter position exactly. Erratic or frozen readings confirm a faulty sensor or circuit.
   Tools: Advanced OBD-II Scanner (Intermediate)
4. Inspect Wiring and Connectors
   Visually inspect the wiring harness and electrical connector at the Transmission Range Sensor (and Throttle Position Sensor on Nissans). Look for broken wires, corrosion, loose pins, or fluid contamination.
   Tools: Flashlight (Intermediate)
5. Check Transmission Fluid
   Check the transmission fluid level and condition. Low, burnt, or dirty fluid causes shifting problems and triggers this code on GM and Mitsubishi models.
   Tools: Rag, Dipstick (if equipped) (Beginner)
6. Check for Technical Service Bulletins (TSBs)
   Search for TSBs related to P1705 for your specific vehicle. Manufacturers release bulletins for known issues, providing updated parts or specific wiring repairs that save significant diagnostic time.
   Tools: Online Service Information (Intermediate)
7. Pro Tip: Back-Probe the Sensor Circuit
   Using a multimeter and a wiring diagram, back-probe the TRS connector. With the key on, verify the reference voltage (5V or 12V) and ground. Test the signal wires as you move the shifter. If power and ground are present but the signal is incorrect, the sensor has failed.
   Tools: Digital Multimeter, Vehicle Service Manual (Advanced)
8. Pro Tip: Analyze TPS Live Data (Nissan)
   On a Nissan, monitor the Throttle Position Sensor PIDs within the TCM. The 'ACCEL PEDAL POS' must show a smooth voltage increase as you press the accelerator. Erratic or missing data means the problem lies in the CAN communication, ECM, or TPS, not the TRS.
   Tools: Advanced OBD-II Scanner (Advanced)
9. Pro Tip: Test TRS Voltage Logic (Honda)
   Test the TRS circuit at the PCM on Hondas. Measure voltage between PCM terminal C10 (ATP R) and ground. It should read 10V when the shifter is in any position other than Reverse. Incorrect voltage indicates a short or switch fault.
   Tools: Digital Multimeter, PCM Pinout Diagram (Advanced)
10. Pro Tip: Test Sensor Resistance (Toyota)
    For Toyota models where P1705 indicates a Direct Clutch Speed Sensor fault, disconnect the sensor and measure resistance between its terminals. A reading far outside the specification (typically ~1,000 Ohms at 176°F) or infinite resistance confirms a failed sensor.
    Tools: Digital Multimeter, Vehicle Service Manual (Advanced)
11. Analyze with an Oscilloscope
    Connect an oscilloscope to the TRS signal wire to visualize the voltage pattern during shifts. A faulty sensor shows noise, glitches, or voltage dropouts between shifts, confirming an internal failure a multimeter misses.
    Tools: Oscilloscope, Service Manual (Advanced)

When This Code Triggers (Freeze-Frame Conditions)

• Engine Coolant Temp: 170-210°F (The fault often occurs when the engine is at full operating temperature.)
• RPM: 1200-2800 RPM (The code frequently sets during light acceleration or steady-state cruising, not typically at idle.)
• Vehicle Speed: 25-60 mph (P1705 is most likely to trigger once the vehicle is in motion, as the TCM actively monitors gear position and shift commands.)
• Throttle Position: 15-40% (The fault appears under normal driving loads rather than at idle (0%) or wide-open throttle (100%).)

Related Codes

• P0705 — This is the generic SAE version of the same fault. If you see P0705, diagnosis starts at the TRS circuit. If you see P1705, you must check manufacturer-specific definitions first.
• P0700 — This is a general transmission system fault code indicating the TCM requested the Check Engine Light to turn on. You must use an advanced scanner to read the specific code (like P1705) stored in the TCM.
• U1000 — Indicates a CAN bus communication error. When paired with P1705 on Nissan/Infiniti, it confirms the TCM lost communication with the ECM. Diagnosis must focus on the CAN network and grounds, not the sensors.
• P0706 — Indicates a 'Transmission Range Sensor A Circuit Range/Performance' issue. It sets when the sensor signal is intermittent or irrational (jumping between gears) rather than completely lost.

Climate & Environmental Factors

• Road Salt & Humidity: In regions with high humidity or road salt, corrosion accelerates on the external TRS electrical connectors and pins. This corrosion creates high resistance or open circuits, blocking the signal.
• Heat Cycles: The TRS is mounted on the transmission, exposing it to extreme heat. Over thousands of heat cycles, internal plastic and electronic components become brittle and fail, and wiring insulation cracks.
• Vibration: Constant engine and road vibration fatigues wires in the TRS circuit, causing internal breaks even if the insulation looks intact. It also loosens electrical connectors, leading to intermittent signal dropouts.

How to Talk to a Mechanic About This Code

Say this: "I have a P1705 code and my car won't start intermittently. I'd like a diagnostic to confirm if the issue is the transmission range sensor, its wiring, or an adjustment. On my vehicle, I know this can also be a throttle position sensor communication issue, so please check that as well."

This shows you understand the common causes and manufacturer-specific quirks. It directs the technician to perform a thorough diagnosis rather than just replacing the most common part, preventing misdiagnosis.

Avoid saying:

• 'My car won't start, can you fix it?'
• 'The check engine light is on, just tell me what it costs.'
• 'I think it's the neutral safety switch, just replace it.'

Questions to ask before authorizing the repair:

• Did you confirm the diagnosis by testing the sensor's signal with a scan tool or multimeter?
• If you are recommending a sensor replacement, how did you rule out a wiring or adjustment issue?
• For a Nissan/Infiniti: Can you show me the live data for the throttle position sensor as seen by the TCM?
• What is the warranty on the parts and labor for this repair?

Where to Take It: Dealer vs Independent vs Chain

• Dealer:
  Best for: Vehicles under warranty, Complex manufacturer-specific issues (like Nissan's CAN bus problems or Toyota's speed sensor fault), When a Technical Service Bulletin (TSB) applies
  Downsides: Significantly higher labor rates and parts costs, May recommend replacing a larger assembly when a smaller component has failed (Typical cost: +50% vs. baseline)
• Independent Shop: Best fit for most common P1705 scenarios. An experienced independent mechanic easily diagnoses and replaces a faulty TRS. However, for specific Nissan/Infiniti or Toyota variants, a dealer or specialist is better equipped.
  Best for: Out-of-warranty vehicles where the cause is a common failure (like a bad TRS on a GM or Ford), General wiring repairs and sensor replacements
  Downsides: May lack expensive, manufacturer-specific diagnostic tools, Quality and expertise vary greatly; look for ASE certification (Typical cost: +0% vs. baseline)
• Chain Shop: Use with caution. Acceptable for a straightforward TRS replacement if you are certain that is the problem. AVOID for initial diagnosis, especially on Nissan, Infiniti, or Toyota.
  Best for: Simple, straightforward part replacements when the diagnosis is already certain
  Downsides: Technician experience varies widely, Lacks the advanced diagnostic capabilities to differentiate between a bad sensor, a wiring fault, or a communication issue (Typical cost: -10% vs. baseline)

When to Walk Away From the Repair

If the estimated repair cost for the transmission issue exceeds 50% of your car's private-party value, seriously consider selling or trading it in.

• Car worth $4000, fix is $2200: Walk away. The repair cost is over half the car's value, and other age-related issues are likely to appear soon.
• Car worth $12000, fix is $1800: Fix it. The repair cost is a small fraction of the car's value and restores its function and safety.
• Car worth $3000, fix is $3000: Walk away. A repair costing the full value of the car is not a sound investment.

What Scan Tool You Need for This Code

Minimum: An OBD-II reader that displays live data for the transmission range sensor.

A basic $20 code reader only shows the P1705 code. It cannot show live data from the sensor. Without seeing if the sensor's reported gear position matches the actual shifter position, you are guessing at the problem.

Budget: BlueDriver Pro (~$120) — Connects to your smartphone to read and clear transmission codes, and displays live data for the Transmission Range Sensor PID, allowing you to watch its output as you move the shifter.

Mid-range: Foxwell NT510 Elite (~$180) — Offers manufacturer-specific diagnostics. It performs bi-directional tests to command transmission solenoids and provides detailed live data streams crucial for diagnosing Nissan/Infiniti throttle signal issues.

Professional: Autel MaxiCOM MK808 / MK808BT (~$450-600) — Provides full system diagnostics, including advanced transmission functions. It performs TCM resets and relearn procedures required after replacing a sensor to ensure the system operates correctly.

Rent vs buy: For a one-time diagnosis, auto parts stores read codes for free, but their tools may not show live data. If you plan to diagnose the issue yourself, buying a scanner like the BlueDriver is a worthwhile investment.

How to Clear the Code After You Fix It

1. Use an OBD-II scan tool to clear the P1705 code from the TCM/ECM.
2. Perform a complete OBD-II drive cycle to allow the vehicle's readiness monitors to run.
3. Re-scan the vehicle to confirm no codes have returned and that readiness monitors are set.

Drive cycle (~20 minutes): A generic drive cycle includes: 1) Cold start and idle for 2-3 minutes. 2) Drive in stop-and-go traffic with several accelerations and decelerations. 3) Drive at a steady highway speed (around 55 mph) for at least 5-10 minutes. 4) Coast down without braking. 5) Allow the vehicle to cool down completely (8+ hours) and repeat if necessary.

Readiness monitors affected: Comprehensive Component Monitor (CCM), Transmission

Before emissions retest: drive at least 100 miles to fully set monitors.

Watch out for:

• Clearing the code with a scanner does not fix the underlying mechanical or electrical problem; the code returns immediately.
• Disconnecting the battery clears the code but resets all readiness monitors, causing an immediate emissions test failure.
• Failing to follow the specific drive cycle requirements for your vehicle prevents monitors from setting.

Will This Fail Emissions / State Inspection?

Yes — this code typically fails an OBD-II emissions inspection.

• California: An active P1705 code causes an automatic failure of the smog check. All required readiness monitors must be set to 'Ready', requiring 100+ miles of driving after a repair.
• New York: The NYS DMV emissions inspection includes an OBD-II scan. An illuminated Check Engine Light for P1705 results in an immediate test failure.
• Texas: In the 17 Texas counties requiring emissions testing, a vehicle with P1705 fails the OBD-II portion of the inspection.

Most Commonly Affected Vehicles

• Nissan Altima, Titan, Rogue, Frontier, Xterra (2003-2019) — Frequently triggers P1705 related to a loss of the throttle position sensor signal to the TCM. On 2005+ Frontiers, this is sometimes caused by coolant contamination from a leaking transmission cooler (TSB NTB10-126a).
• Infiniti G35 (2004-2007) — Commonly experiences P1705 due to a Throttle Position Sensor circuit failure, where the TCM does not receive the correct signal from the ECM via the CAN bus.
• Ford F-150, Ranger, Transit (2001-2016) — The code usually means the TRS did not report a Park or Neutral position during the Key On Engine Off (KOEO) self-test. It often appears with codes P0707 and P2802.
• Chevrolet / GMC Silverado, Sierra, Tahoe (2005-2020) — The code points to the TRS (NSBU switch) sending an invalid or conflicting signal, such as reporting it is in Drive and Reverse simultaneously.
• Honda Civic, Accord (1995-2005) — P1705 indicates a malfunction in the Transmission Range Sensor circuit, often causing a no-start condition or a blinking 'D' light on the dash.
• Acura TL (1999-2003) — Defined as 'Transmission Range Switch Low Input', pointing to a short in the switch circuit or a failed switch.
• Toyota Camry, Avalon (1996-2001) — P1705 points to a 'Direct Clutch Speed Sensor Circuit Malfunction' rather than the gear range sensor. The ECM detects a fault when the clutch speed sensor reports less than 300 RPM while the vehicle is moving.
• BMW 3-Series (E46) (1999-2006) — Typically appears as the generic code P0705. Caused by worn internal contacts in the gear position switch mounted on the ZF 5HP transmission.

Manufacturer-Specific Notes

• Nissan / Infiniti: P1705 is frequently related to the Throttle Position Sensor (TPS). The transmission computer needs throttle data to shift correctly; losing this signal triggers the code. Technicians often misdiagnose this and replace the TRS when the TPS or CAN circuit is the real culprit.
• Ford: The code specifically means the Transmission Range Sensor was not in Park or Neutral during the Key On Engine Off (KOEO) self-test. Starting the test with the shifter in gear triggers this code.
• General Motors (Chevrolet/GMC): The code means the TRS sent an 'invalid' signal. This happens when worn internal contacts send conflicting data, like signaling Drive and Reverse simultaneously.
• Honda / Acura: Improperly installed aftermarket alarms or remote start systems frequently create a short in the transmission range sensor circuit, triggering P1705.
• Subaru: On older models with the 4EAT transmission, P1705 refers to a '2-4 Brake Timing Circuit Malfunction', pointing to an internal transmission shift solenoid issue rather than the external range sensor.
• Toyota: On 1996-2001 Camrys, P1705 indicates a fault with the 'Direct Clutch Speed Sensor' (NC2 Revolution Sensor) located on the transmission case, not the gear selector switch.
• Nissan (Frontier/Xterra/Pathfinder): TSB NTB10-126a covers a failed internal barrier in the radiator transmission cooler. Coolant mixes with ATF, damaging the transmission's valve body and electronics, triggering P1705 and requiring a full rebuild.

Real Owner Stories

2011 Nissan Sentra at 133K miles - The Misdiagnosis

Car intermittently failed to start or stalled immediately, with Check Engine and Traction Control lights on. Code P1705 was confirmed by a mechanic and the dealer.

What they tried:

1. Following the dealer's advice, the mechanic replaced the entire throttle body with an OEM part and programmed it.
2. The problem returned a few days later.

Outcome: The owner spent money on a new throttle body and labor without resolving the issue. The root cause was in the CAN communication circuit or the ECM, not the throttle body itself.

Lesson: On a Nissan/Infiniti, do not automatically replace the Throttle Position Sensor or throttle body for a P1705. The code means the TCM isn't receiving the signal, which is often a wiring, ground, or ECM/TCM communication problem.

1999 Honda Accord - The Unusual Cause

Car had a blinking D4 light, harsh shifting from Park to Reverse, no first gear, and code P1705 for a short in the transmission range circuit.

What they tried:

1. The owner replaced the Transmission Range Switch.
2. They replaced the Powertrain Control Module (PCM).
3. They checked all related wires for opens and shorts but found nothing.

Outcome: The owner found a poorly installed aftermarket remote start system under the dash shorting out the signal voltage. Removing the aftermarket box completely fixed the issue and cleared the code.

Lesson: If your Honda has P1705 and any aftermarket electronics, inspect them first. A faulty or improperly wired module is a known cause and saves you from replacing expensive OEM parts.

1998 Toyota Camry V6 - The Make-Specific Anomaly

The car lost power, revving with weak transmission engagement, and eventually stopped engaging gears altogether. The Check Engine Light came on with code P1705.

What they tried:

1. The owner researched the Transmission Range Sensor but couldn't locate it.
2. A forum expert clarified that for this Toyota model, P1705 means 'Direct Clutch Speed Sensor Circuit Malfunction'.

Outcome: The symptoms combined with the correct code definition pointed to a severe internal transmission problem. The speed sensor detected a logic error, indicating a failed clutch pack requiring a transmission rebuild.

Lesson: Always verify the manufacturer-specific definition of P1705. On older Toyotas, it points to the Direct Clutch Speed Sensor, and symptoms like slipping indicate a serious internal transmission failure.

How to Prevent This Code From Triggering

• Perform regular transmission fluid exchanges. (Every 30,000-60,000 miles, or per manufacturer's recommendation.) — Clean fluid maintains correct hydraulic pressures and provides cooling. On GM models, low or dirty fluid directly triggers P1705. It prevents overheating and premature wear that damages internal electronics.
• Inspect and protect the TRS electrical connector. (Every 1-2 years, especially in winter climates.) — The external TRS connector is vulnerable to road salt and moisture. Unplugging the connector, cleaning it with electrical contact cleaner, and applying dielectric grease prevents corrosion failures.
• Maintain a healthy battery and charging system. (Test battery annually after 3 years of age.) — A weak battery causes low system voltage, leading to data corruption and CAN bus errors between the ECM and TCM. On Nissans, this triggers P1705 even if the sensors are fine.
• Address fluid leaks promptly. (As needed.) — Engine oil or transmission fluid leaking onto the TRS wiring harness degrades the insulation over time, leading to shorts or open circuits.

Frequently Asked Questions

Can a bad battery cause a P1705 code?

Yes, indirectly. A failing battery causes low system voltage (below 12V), leading to data corruption on the CAN bus. This triggers P1705 alongside communication codes like U1000, especially on Nissans.

Is the Transmission Range Sensor the same as a Neutral Safety Switch?

Yes, they are often the same part. 'Neutral Safety Switch' refers to its function of allowing starts only in Park or Neutral, while 'Transmission Range Sensor' refers to reporting all selected gears to the computer.

I replaced the sensor, but the code came back. What now?

If a new sensor fails to fix the issue, re-check the sensor's physical alignment. Inspect the wiring harness for hidden damage, and on Nissans, investigate the throttle position sensor signal. If all else fails, the control module requires professional reprogramming.

What is a common misdiagnosis for P1705?

A frequent mistake on Nissan and Infiniti vehicles is immediately replacing the Transmission Range Sensor. On these makes, P1705 is usually caused by a loss of the throttle position signal, meaning the actual culprit is the TPS, ECM, or CAN bus wiring.

My car has P1705 and won't go into reverse. Are these related?

Yes. If the TCM cannot verify the selected gear, or if the vehicle enters limp mode, it ignores the command to engage reverse. The transmission physically locks out reverse to prevent internal damage.

Will clearing the code fix the problem?

No. Clearing the code only turns off the check engine light temporarily. Because P1705 stems from a hard electrical or mechanical failure, the code returns immediately during the next drive cycle.

How can I tell if it's the sensor or the wiring?

Use a multimeter to back-probe the sensor's electrical connector. If the connector receives the correct 5V or 12V reference and ground but outputs the wrong signal, the sensor is bad. If it lacks power or ground, the wiring harness is the problem.

My car has P1705 and an aftermarket remote starter. Could they be related?

Yes, absolutely. Improperly installed aftermarket alarms or remote starters on Hondas are frequently spliced directly into the transmission range sensor circuit. This creates a short or voltage drop that the computer interprets as a P1705 fault.

Key Takeaways

• P1705 primarily indicates a failed Transmission Range Sensor (TRS), but on 2003-2019 Nissan and Infiniti models, it usually means the transmission lost the throttle position signal.
• Never replace the TRS without first checking live scanner data to verify if the reported gear matches your physical shifter position.
• If your Honda or Acura has a P1705 code and a blinking 'D' light, inspect the wiring under the dash for a poorly installed aftermarket remote starter before buying parts.
• Driving with an active P1705 code forces the transmission into 'limp mode', which overheats fluid and causes internal damage exceeding $2,000 if ignored.
• Always test the vehicle's startup logic by wiggling the shifter in Park and Neutral; if the engine cranks intermittently, the TRS requires adjustment or replacement.