OBD-II Code C1708: Tire Pressure Sensor Communication Failure (Front Left)

What Does C1708 Mean?

Code C1708 means the vehicle's Body Control Module (BCM) lost communication with the front left tire pressure sensor. This is a 'No Data' fault indicating the radio frequency signal from that specific wheel is not reaching the receiver.

Technical definition: The Body Control Module (BCM) failed to receive data from the front left TPMS sensor-transmitter. This logs a 'No Data' condition because the vehicle's TPMS receiver is not picking up the sensor's 315MHz or 433MHz radio frequency signal.

Can I Drive With C1708?

Yes, But With Caution. Yes, but the TPMS is disabled for the front left tire. Driving on a significantly underinflated tire causes poor handling, increased braking distances, and a high risk of a blowout. A tire driven flat is destroyed in minutes, costing $100-$300+ to replace, and damages the wheel, adding hundreds more. Manually check your tire pressure with a quality gauge until the system is repaired.

Common Causes

• Dead TPMS Sensor Battery (Very Common) — The internal TPMS sensor battery has a finite 5-10 year lifespan. For vehicles over 5 years old, this is the most frequent cause. The sensor is sealed and requires complete replacement.
• Radio Frequency (RF) Interference (Very Common) — Aftermarket devices like phone chargers or dash cams plugged into 12V outlets emit radio signals that block the 315MHz/433MHz TPMS signal. This is a critical first diagnostic step, especially for Nissan and Infiniti vehicles.
• Corroded or Damaged Valve Stem Assembly (Common) — Road salt and moisture cause galvanic corrosion between aluminum stems, retaining nuts, and steel wheels. This destroys the sensor's sealing surface or internal electronics.
• Improperly Registered or Unprogrammed Sensor (Less Common) — If a new sensor was installed or tires were rotated, the sensor's unique ID must be registered to the BCM. Skipping this step triggers the code.
• Failed TPMS Sensor Electronics (Less Common) — Internal corrosion, physical damage during a tire change, or unapproved liquid tire sealants destroy the sensor's internal components.
• Faulty HVAC Blower Motor (Nissan Specific) (Rare) — On specific Nissan models (370Z, GT-R), a failing HVAC blower motor generates severe RF interference that disrupts the TPMS signal (per TSB NTB19-062).
• Aftermarket Wheels Incompatibility (Uncommon) — Thick aftermarket wheels or specific metal alloys block or weaken the TPMS radio signal.
• Faulty TPMS Receiver or BCM (Rare) — The central receiver module fails, usually indicated by multiple simultaneous sensor codes. Water intrusion in the passenger footwell is a known cause.

Symptoms

• Flashing then Solid TPMS Warning Light — The TPMS warning light flashes for one minute at startup, then stays solid. This specific sequence indicates a system fault, not low tire pressure.
• No Tire Pressure Reading for Front Left — The dashboard display for the front left tire shows blank, dashes (--), or 0.
• 'Service Tire Monitor System' Message — A 'Service Tire Monitor System' message appears on the driver information center.
• Inability to Clear Warning Light — Adding air does not turn off the warning light. The code requires a scanner reset after repair.
• OBD-II Code Present in BCM (scan-tool only — no driver-felt sign) — A BCM-capable scanner reads C1708. Basic engine scanners cannot see this code.

Diagnostic Flowchart

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

Common Fixes & Costs

• Remove Interfering Aftermarket Device — Parts: $0, Labor: $0, ~0.1 hr book time (DIY)
• Replace the Failed TPMS Sensor — Parts: $50-$100, Labor: $50-$100, ~0.8 hr book time (Professional)
• Replace all four TPMS sensors — Parts: $150-$300, Labor: $100-$200, ~1.5 hr book time (Professional)
• Register (Relearn) Sensor IDs to BCM — Parts: $0, Labor: $50-$100, ~0.5 hr book time (Professional)
• Replace Faulty HVAC Blower Motor — Parts: $100-$250, Labor: $75-$150, ~1.2 hr book time (Intermediate)

Used vs. New Parts: Buying Guide

When a used part is worth it: Never buy a used TPMS sensor. The internal battery has a strict 5-10 year lifespan, making a used sensor a guaranteed future failure.

Donor-vehicle mileage cap: roughly under 20000 miles for the part to have meaningful remaining life.

Donor quality checklist:

• Only consider a 'used' sensor if it is a take-off from a nearly new vehicle (e.g., wrecked with very low miles).
• Verify the part number and frequency (315MHz or 433MHz) match your vehicle's requirements exactly.
• Avoid sensors with any visible corrosion on the valve stem or housing.

Decision logic:

• If The vehicle is over 5 years old. → Buy new sensors. The original batteries are nearing the end of their life.
• If Budget is the primary concern. → Buy a high-quality new aftermarket sensor (Schrader, Autel) instead of a used OEM sensor.

Warranty tradeoff: Used parts: Typically no warranty or a 30-day max. Aftermarket new: 1-3 year warranty is common. OEM new: Usually a 1-year/12,000-mile parts warranty.

Worst-case if a used part fails: $100-$200 in repeat labor for dismounting, mounting, and balancing the tire when the used sensor fails.

What Happens If You Wait — Timeline

1. 0-1 month: TPMS light flashes then stays solid. Low-pressure warnings are disabled for the front-left tire. (MPG impact: 0%% · Added cost: $0)
2. 1-3 months: An undetected slow leak causes underinflation, increasing rolling resistance and uneven tire wear. (MPG impact: 1-3%% · Added cost: $20-$50 in wasted fuel.)
3. 3-6 months: Driving on a severely underinflated tire shreds the internal sidewall structure, requiring mandatory replacement. (MPG impact: 5-10%% · Added cost: $150-$400 for a mandatory new tire, plus mounting and balancing.)
4. 6+ months: Sudden blowout at highway speeds causes loss of control, destroying the wheel rim and fender. (MPG impact: N/A% · Added cost: $500-$5000+)

Cost of Not Fixing It

• Immediate: Loss of safety alerts for a low front-left tire, increasing blowout risk. (Added cost: $0)
• 0-3 months: Driving on an undetected slow leak destroys the tire sidewall in minutes. (Added cost: $150-$400)
• 3+ months: A sudden blowout at highway speeds causes loss of vehicle control and severe wheel/body damage. (Added cost: $500-$5000)

Diagnosis Steps

1. Check for Radio Interference (Critical First Step)
   Unplug ALL aftermarket accessories from 12V power outlets. Drive for 10-15 minutes above 25 MPH. If the light goes out, the accessory caused the fault.
   Tools: None (Beginner)
2. Observe the TPMS Light Behavior
   Start the car. A light flashing for one minute before staying solid confirms a system fault (C1708). A solid light from the start means low pressure.
   Tools: None (Beginner)
3. Test the TPMS Sensor with an Activation Tool
   Use a TPMS tool at the front left wheel. If the tool gets no response or shows voltage below 2.5V, the sensor is dead and requires replacement.
   Tools: TPMS Activation/Diagnostic Tool (Intermediate)
4. Confirm Physical Sensor Location
   Test all four wheels. If tires were rotated without a relearn, the failing 'Front Left' sensor is physically on a different corner.
   Tools: TPMS Activation/Diagnostic Tool (Intermediate)
5. Read the Code and Note Others
   Confirm C1708 is active. Note any other TPMS codes (C1709-C1711) or communication codes (U1000) which indicate a central module failure.
   Tools: OBD-II Scanner (BCM/Chassis capable) (Intermediate)
6. Pro Tip: Check for HVAC Blower Motor Interference (Nissan)
   On susceptible Nissan models, turn the HVAC fan to maximum. If the TPMS signal drops out on your tool, the blower motor is causing interference.
   Tools: TPMS Activation/Diagnostic Tool (Advanced)
7. Pro Tip: Test TPMS Receiver Voltage and Ground
   Back-probe the TPMS receiver connector. Verify 12V power and a ground reading below 0.1V. Loss of power or ground disables the system.
   Tools: Multimeter, Vehicle-specific wiring diagram (Advanced)
8. Inspect Wiring and BCM
   Visually inspect the wiring harness leading to the TPMS receiver and BCM for chafing or water corrosion, especially in the passenger footwell.
   Tools: Flashlight, Basic Hand Tools (Advanced)

When This Code Triggers (Freeze-Frame Conditions)

• Vehicle Speed: 25-55 mph (The TPMS module actively monitors sensors in motion. Faults register after driving for 5-10 minutes above 25 mph.)
• Time Since Ignition On: 5-20 minutes (The system requires time to poll sensors and confirm a consistent lack of signal before setting the code.)
• Ambient Temperature: < 40°F or > 90°F (Extreme cold drops the voltage of an aging battery, stopping transmission. Extreme heat accelerates battery degradation.)
• System Voltage: 11.5-14.5V (Normal operating voltage. The fault isolates to the sensor's transmission, not the vehicle's main electrical system.)

Related Codes

• C1709, C1710, C1711 — Identical 'No Data' codes for the Front Right, Rear Right, and Rear Left sensors. Multiple codes indicate a central receiver failure or severe RF interference.
• U1000 (Nissan/Infiniti) — CAN communication network failure. Diagnose this FIRST. C1708 is a symptom of the network failure, not the root cause.
• C0750, C0755, C0760, C0765 (GM) — GM-specific codes for individual wheel sensors, functionally equivalent to the C1708-C1711 series.
• B124D — Ford-specific code for a TPMS receiver fault. Points to the central module rather than the wheel sensor.

Climate & Environmental Factors

• Cold Weather: Temperatures below 40°F slow the chemical reaction inside aging lithium-ion batteries, dropping voltage and triggering a communication failure.
• High Humidity and Road Salt: Road salt causes galvanic corrosion on aluminum valve stems, seizing nuts and destroying internal electronics.
• High Temperatures: Prolonged exposure to extreme heat accelerates internal battery degradation, shortening the sensor's lifespan.

How to Talk to a Mechanic About This Code

Say this: "I have a flashing TPMS light and a C1708 code. I've ruled out 12V accessory RF interference. Please test the front-left sensor with a TPMS tool and provide an out-the-door quote for replacement, including mounting, balancing, and the relearn procedure."

This signals you are an informed customer. It directs the shop to the correct diagnostic step (testing the sensor), shows you've already performed the free 'easy fix' (checking for RF), and asks for a comprehensive quote, which prevents surprise fees for balancing or relearning later.

Avoid saying:

• 'My tire light is on.'
• 'Just fix whatever is wrong with the TPMS.'
• 'Can you just turn the light off?'

Questions to ask before authorizing the repair:

• Did the tool confirm the sensor is dead?
• Does the quote include the relearn procedure?
• Can you confirm the dead sensor is physically on the front-left wheel?
• Given my vehicle's age, do you recommend replacing all four sensors at once, and what would be the cost difference?
• What is the warranty on the new sensor and your labor?

Where to Take It: Dealer vs Independent vs Chain

• Dealer: Recommended only for complex diagnostics (faulty BCM, Nissan HVAC blower issue) after ruling out common causes. Overpriced for standard sensor swaps.
  Best for: Vehicles under warranty., Complex cases where RF interference and sensor failure have been ruled out., Suspected rare causes like a faulty BCM or the HVAC blower motor issue on specific Nissans.
  Downsides: Highest cost for parts and labor, often 1.5-2x more than other options for a simple sensor replacement. (Typical cost: +50% vs. baseline)
• Independent Shop: Excellent choice for out-of-warranty vehicles. Ensure they have the specific TPMS relearn tools for your make.
  Best for: Out-of-warranty vehicles., Standard sensor replacement after a clear diagnosis., Building a relationship with a trusted local mechanic.
  Downsides: Quality and TPMS-specific tool availability can vary; ensure they are equipped to handle TPMS relearn procedures. (Typical cost: +0% vs. baseline)
• Chain Shop: Best fit. National tire chains (Discount Tire, Costco) perform this service constantly, have the right tools, and offer the best value.
  Best for: Quick, straightforward TPMS sensor replacement., Often have competitive pricing on sensors and labor., Convenient locations and appointment scheduling.
  Downsides: Technician skill can vary. May be less equipped for complex diagnostic work beyond a simple sensor swap. (Typical cost: -10% vs. baseline)

When to Walk Away From the Repair

If the repair cost exceeds 50% of the car's value, consider selling it as-is.

• Car worth $8000, fix is $600: Fix it. Necessary for safety and state inspections.
• Car worth $2000, fix is $750: Borderline. If other major repairs are needed, it is time to walk away.
• Car worth $1500, fix is $1000: Walk away. Spending $1000 on a $1500 car is a poor financial decision.

What Scan Tool You Need for This Code

Minimum: An OBD-II scanner capable of reading Body Control Module (BCM) codes. Basic $20 engine readers cannot see C1708.

A standard $20 code reader only pulls powertrain (P) codes related to the engine and emissions. C1708 is a Chassis/Body code stored in a different module. Without a capable scanner, you won't even know this code is the reason for your TPMS light.

Budget: BlueDriver Pro Scan Tool (~$100) — Reads BCM codes to confirm C1708. Cannot activate or test the sensor at the wheel.

Mid-range: Autel TS508WF / Foxwell NT809TS (~$250-400) — The true DIY solution. Reads OBD-II codes AND acts as a TPMS activation tool to test batteries and perform relearns.

Professional: Autel MaxiCOM MK808S-TS (~$500-700) — Full diagnostic tablet with professional-grade TPMS functions. Activates, reads, programs, and performs OBD relearns.

Rent vs buy: Auto parts stores generally loan out basic engine code readers for free, which are not sufficient for this code. The specialized TPMS tools and BCM-capable scanners are not typically available for rent. For a one-time fix, paying a shop for a ~$100 diagnostic is more economical than buying a midrange tool. Buy a tool only if you plan to perform your own diagnostics regularly.

How to Clear the Code After You Fix It

1. Clear C1708 from the BCM using an OBD-II scanner.
2. Perform the vehicle-specific TPMS relearn procedure to register the new sensor ID.
3. Drive the vehicle above 25 mph for 15 minutes to verify the repair.

Drive cycle (~15 minutes): Drive for 15 minutes consistently above 25 mph. The TPMS light turns off if the repair is successful.

Readiness monitors affected: This code does not affect emissions-related readiness monitors.

Watch out for:

• Forgetting the TPMS relearn procedure after sensor replacement.
• Not driving fast enough (25+ mph) for the system to confirm communication.
• Ignoring RF interference from 12V accessories.

Will This Fail Emissions / State Inspection?

No — by itself this code doesn't fail OBD inspection (but it can keep readiness monitors from setting, which causes a separate fail).

• General: A TPMS light fails a state safety inspection, not an emissions inspection. It indicates a federally mandated safety system (FMVSS 138) is disabled.
• New York: An illuminated TPMS light causes an automatic failure of the annual safety inspection.
• Texas: The TPMS system is checked during the safety inspection. A warning light results in rejection.
• California: Smog Checks focus on emissions. The TPMS light will not fail the smog test, but technicians will flag it as a safety hazard.

Most Commonly Affected Vehicles

• Nissan 350Z / 370Z (2004-2018) — Extremely common due to sensor age and RF interference. TSB NTB19-062 identifies faulty HVAC blower motors as a cause on 2018 models.
• Infiniti G35 / QX50 / QX70 (2004-2017) — Shares Nissan's TPMS system. TSB ITB13039A specifically calls out RF interference from 12V accessories.
• Nissan Frontier / Xterra / Armada (2004-2015) — Sensor battery failure is the primary cause. RF interference is a secondary cause per TSB NTB13-088a.
• Nissan Altima / Maxima / Murano / Versa / Cube / GT-R (2004-2018) — Widespread issue caused by expired sensor batteries or RF interference. Murano (Z51) is highly susceptible.
• Nissan Rogue / Pathfinder / NV (2008-2016) — Extremely common failure from sensor age and 12V accessory interference.
• Ford F-150 / Expedition (2018-2022) — Ford TSBs point to module updates and wiring issues causing communication faults. TPMS module replacement averages $300-$400.
• Chevrolet / GMC Silverado 1500 / Sierra 1500 / Tahoe / Yukon (2019-2022) — GM bulletins (e.g., 07-03-16-004D) indicate module communication issues. Control Module replacement costs $315-$360.
• Hyundai / Kia Tucson / Sonata / Optima / Sorento (2016-2021) — TSBs recommend software updates to control modules to resolve unexpected communication codes before replacing hardware.

Manufacturer-Specific Notes

• Nissan / Infiniti: Highly susceptible to RF interference from 12V accessories (TSBs NTB13-088A, ITB13039A).
• Nissan: Failing HVAC blower motors generate RF interference triggering TPMS codes on 370Z, GT-R, and Versa models (TSBs NTB19-062, NTB10-111).
• General Motors: Requires a specific relearn procedure using the driver information center and a TPMS activation tool after any tire rotation or sensor replacement.
• Ford: Root causes often trace to the Body Control Module (BCM) or TPMS receiver requiring software updates rather than sensor replacement.

Real Owner Stories

2012 Infiniti G37 - The 'Easy Fix'

Owner reported a flashing TPMS light and C1708 code appearing intermittently. No recent tire work had been done.

What they tried:

1. Initially ignored the light, but it became persistent.
2. Read online forums about Nissan/Infiniti's sensitivity to RF interference.

Outcome: Unplugged a cheap aftermarket USB charger from the 12V socket. The charger generated RF noise blocking the sensor signal. The light went off after 15 minutes of driving.

Lesson: Always unplug all 12V accessories before assuming a sensor is bad. This is a free, 5-minute check that saves over $200 on an unnecessary sensor replacement.

2011 Nissan Leaf at 3 years old - Misdiagnosis Story

TPMS light came on, with codes C1708 (Front Left) and C1711 (Rear Left) appearing. The light would clear and then return on subsequent drives.

What they tried:

1. Took it to the dealer, but the light was off at the time, so they couldn't diagnose it.
2. Owner suspected failing sensor batteries due to the car's age (3 years).

Outcome: A vehicle data logger plugged into the OBD port created electrical interference, triggering codes for multiple wheels simultaneously. Multiple codes usually indicate central interference, not simultaneous battery failures.

Lesson: If multiple, seemingly unrelated TPMS codes appear at once, suspect a systemic issue like RF interference or a faulty central receiver before replacing individual sensors.

2018 Nissan 370Z - Unusual Root Cause

The C1708 code and flashing TPMS light appeared. Unplugging 12V accessories did not solve the problem. The sensor itself was tested with a TPMS tool and appeared to be transmitting normally at a standstill.

What they tried:

1. The owner was about to replace the sensor, assuming it was failing under load.
2. A technician familiar with Nissan TSBs suggested a specific test.

Outcome: Following TSB NTB19-062, running the HVAC fan on maximum triggered the C1708 code. The failing blower motor generated RF interference. Replacing the motor resolved the fault.

Lesson: On specific Nissan models, a faulty HVAC blower motor is the root cause. If you've ruled out 12V accessories, perform the TSB test (run the fan on high) before spending money on a sensor.

2021 Nissan Rogue - Post-Tire Change Issue

Owner had all four tires replaced and new TPMS sensors installed. A few days later, the TPMS warning light came on with an over-inflation warning for one tire, even though the pressure was correct.

What they tried:

1. Owner assumed the new sensor was faulty and planned to return to the tire shop for a replacement.

Outcome: TPMS light appeared days after installing new tires. The shop failed to perform the relearn procedure to register the new sensor IDs to the BCM.

Lesson: If a TPMS light appears immediately after getting new tires or sensors, the most likely cause is an error in the installation or programming process, not a defective new part.

How to Prevent This Code From Triggering

• Replace TPMS Service Kit Components at Every Tire Change (Whenever a tire is dismounted from a wheel.) — Replace the valve core, nut, seal, and cap during every tire change to prevent galvanic corrosion.
• Use High-Quality, Sealing Valve Caps (Always keep them on.) — Keep high-quality caps with internal rubber O-rings installed to block moisture and road salt.
• Avoid Using Unapproved Tire Sealants (In case of a flat tire.) — Do not use emergency liquid tire sealants. They clog the sensor's pressure port and destroy internal electronics.
• Proactively Replace All Sensors on Older Vehicles (Once, around the 7-10 year mark.) — Replace all four sensors at the 7-10 year mark during a tire change to save hundreds in repeated labor costs.
• Use High-Quality Aftermarket 12V Accessories (When adding chargers, dash cams, etc.) — Use well-shielded, name-brand 12V chargers to prevent RF interference.

Frequently Asked Questions

Can I just replace the battery in the TPMS sensor?

No. The batteries are sealed inside the sensor unit and cannot be replaced. You must replace the entire TPMS sensor assembly.

Why did the light come on after I got new tires?

The sensor was likely damaged during the tire mounting process, or the shop forgot to perform the required 'relearn' procedure. Return to the shop to have them register the sensor IDs to the vehicle.

The code is for the front left, but the shop says the bad sensor is on the rear right. Why?

Code C1708 refers to the programmed position in the computer. If tires were rotated without a relearn procedure, the original front-left sensor is now physically on a different wheel. A TPMS tool confirms the true physical location.

Is it okay to replace just one sensor?

Yes, but it is not recommended for vehicles over 7 years old. Sensor batteries have similar lifespans, so the others will fail soon. Replacing all four at once saves significant money on future labor costs.

What's the most common misdiagnosis for C1708?

Replacing the TPMS sensor without ruling out Radio Frequency (RF) interference first. Unplug all aftermarket 12V accessories (phone chargers, dash cams) and re-test before buying parts.

Do I need an OEM sensor or is aftermarket okay?

High-quality aftermarket sensors from brands like Schrader, VDO, or Autel work perfectly and cost less than OEM. Ensure the shop programs the aftermarket sensor correctly for your specific vehicle.

What is the difference between a flashing TPMS light and a solid one?

A light that flashes for one minute at startup then stays solid indicates a system malfunction like code C1708. A light that is solid immediately means one or more tires has low air pressure.

Will the C1708 code clear itself?

If the cause was temporary RF interference, the light turns off after driving 10-15 minutes without the interfering device. If the sensor battery died, the code remains active until the sensor is replaced and cleared with a scanner.

Key Takeaways

• Unplug all 12V accessories like phone chargers and dash cams before buying parts; radio frequency interference is a leading cause of C1708, especially on Nissan and Infiniti vehicles.
• Expect to pay $100 to $200 per wheel at a tire shop to replace a dead TPMS sensor, as the internal batteries have a strict 5 to 10-year lifespan and cannot be recharged.
• Do not add air to your tires if the TPMS light flashes for 60 seconds at startup; this specific sequence indicates a system communication failure, not low tire pressure.
• Verify the physical location of the dead sensor using a TPMS activation tool, because tire rotations without a system relearn will cause the 'Front Left' code to point to the wrong wheel.