P0715 on 2007-2017 Jeep Wrangler: Input Speed Sensor Causes and Fixes

What's Unique About the 2007-2017 Jeep Wrangler

The 2007-2017 Jeep Wrangler JK spans two different automatic transmissions, and the fix for P0715 is completely different for each. Wranglers from 2007-2011 with the 3.8L V6 use a Chrysler 42RLE transmission, where the input speed sensor is an inexpensive, externally mounted part. In contrast, 2012-2017 Wranglers with the 3.6L Pentastar V6 use a Mercedes-designed W5A580 (NAG1) transmission, where the speed sensors are integrated into an internal 'conductor plate' that is a very common failure point.

Generation note: While the entire 2007-2017 range is the Jeep Wrangler 'JK' generation, there was a major powertrain change in 2012. The engine changed from the 3.8L EGH V6 to the 3.6L Pentastar V6, and the automatic transmission changed from the Chrysler 42RLE (4-speed) to the Mercedes W5A580/NAG1 (5-speed). The cause and repair for code P0715 are entirely different between these two configurations.

Symptoms You May Notice

• Check Engine Light is on
• Transmission is stuck in a single gear (usually 2nd), known as 'limp mode'
• Harsh, erratic, or delayed gear shifts
• Vehicle feels sluggish and has poor acceleration
• Reduced fuel economy
• Inoperable cruise control.
• Traction control light may illuminate

Most Likely Causes

1. Faulty Transmission Conductor Plate (2012-2017 models w/ W5A580/NAG1) 🔴 High Probability The conductor plate, which houses the input and output speed sensors, is a well-known failure point on the Mercedes-designed 722.6/W5A580 transmission. Heat and vibration cause hairline cracks in the plastic housing and the solder joints for the sensors, leading to intermittent or total signal loss.
   How to confirm: Use a high-end scan tool to monitor input speed sensor data; a reading of zero or erratic values while driving points to the sensor. Given the high failure rate, if the code is present, the conductor plate is the most likely culprit. Also, inspect the 13-pin connector for transmission fluid, which indicates a leaking connector sleeve and often precedes conductor plate failure. A technician can also test solenoid and sensor resistance from the TCM connector without dropping the pan.
   Typical fix: Replace the transmission conductor plate, the 13-pin connector sleeve, the filter, and the fluid. This is done by removing the transmission pan and valve body.
   Est. part cost: $150-$350
2. Faulty Input Speed Sensor (2007-2011 models w/ 42RLE) 🔴 High Probability The external speed sensors on the 42RLE are exposed to the elements, heat, and vibration, and can fail over time. It's a common maintenance item.
   How to confirm: The sensor is located on the driver's side of the transmission case. It can be tested with a multimeter for resistance; a new sensor often reads around 700 ohms, while a failing one might read lower (e.g., 500 ohms) and a completely bad one will show an open circuit (no reading). Due to its low cost, it is often replaced as the first step in diagnosis.
   Typical fix: Unplug and unbolt the old sensor from the outside of the transmission case and install the new one. 🎬 Watch where to find and replace 42RLE speed sensors A small amount of transmission fluid will leak out during the swap.
   Est. part cost: $30-$60
3. Damaged Wiring or Connector ⚪ Low Probability On Wranglers used off-road, the wiring harness can be damaged by debris or snagging. On 42RLE models, a known chafe point is where the harness can rub against the back of the valve cover, causing a short. On W5A580 models, the 13-pin connector O-rings fail, allowing fluid to wick up the harness all the way to the TCM, causing shorts and communication errors.
   How to confirm: Visually inspect the wiring harness leading to the transmission for any signs of chafing, breaks, or corrosion. For W5A580, unplug the TCM (located under the dash, below the steering wheel) and check its connector for any signs of red transmission fluid.
   Typical fix: Repair the damaged section of the wire or replace the corroded connector. If fluid has reached the TCM, it and the harness may need to be thoroughly cleaned with electrical contact cleaner, or potentially replaced.
   Est. part cost: $10-$50 for wire repair, $20 for a new connector sleeve, $200+ if TCM is damaged.

Rare But Worth Checking

• Faulty Powertrain Control Module (PCM) / Transmission Control Module (TCM): This should only be considered after all other possibilities (sensor, conductor plate, wiring) have been definitively ruled out. Module failure is uncommon but can happen, especially on 2012-2017 models if the TCM becomes contaminated with transmission fluid that has wicked up the wiring harness.
• Low or Incorrect Transmission Fluid: Extremely low or incorrect fluid type (the 42RLE requires ATF+4, the W5A580 has its own specific fluid requirements) can cause a variety of shifting issues and codes. This should be one of the first things checked.

Diagnosis Steps

1. Identify the transmission: Determine if you have the 42RLE (2007-2011, 4-speed) or W5A580/NAG1 (2012-2017, 5-speed) as the diagnostic path differs completely.
2. For 2012-2017 (W5A580/NAG1):
3. a. Inspect the round 13-pin electrical connector at the front passenger side of the transmission. Unplug it and check for any sign of red transmission fluid. If fluid is present, the connector sleeve O-rings have failed and the sleeve must be replaced. This is a mandatory part of the repair.
4. b. Check the TCM under the dashboard (below the steering wheel) for fluid contamination. If fluid has wicked up the harness, both the harness and TCM will need to be thoroughly cleaned with electrical contact cleaner, or potentially replaced.
5. c. If no fluid is found, use a multimeter to test the conductor plate solenoids and sensors from the TCM connector to verify the failure before disassembly. (See Specific Diagnostic Values section).
6. d. If tests confirm a fault, the fix is to drain the transmission fluid, remove the pan, and remove the valve body to access and replace the conductor plate, 13-pin connector, filter, and fluid.
🎬 Watch this DIY guide on replacing the NAG1 conductor plate
7. For 2007-2011 (42RLE):
8. a. Inspect the wiring harness going to the input and output speed sensors on the driver's side of the transmission. Pay close attention to the area where the harness may rub against the back of the engine valve cover.
9. b. Test the sensor. Unplug the input speed sensor and test its resistance with a multimeter. A good sensor should read around 700 Ohms. If it's an open or short circuit, it's bad.
10. c. If wiring is okay and the sensor tests bad (or if you can't test it), replace the Input Speed Sensor. It is inexpensive and the most likely cause. Many owners replace both the input and output sensors at the same time as preventative maintenance.
11. Clear codes and test drive. Note that stubborn transmission codes, especially on the W5A580, may require a dealer-level scan tool (like wiTECH or STAR) to fully clear the fault from the TCM and reset adaptations.

Parts You'll Likely Need

• Transmission Conductor Plate (for 2012-2017 W5A580/NAG1) (OEM #52108308AC (supersedes 52108308AB)) — This is the primary failure point for P0715 on the 3.6L Wrangler. The speed sensors are integrated into this electronic plate inside the transmission.
  Trusted brands: Mopar, Dorman (917-678), SKP, Rostra
  OEM price range: $250-$350
  Aftermarket price range: $130-$280
• Input Speed Sensor (for 2007-2011 42RLE) (OEM #4799061AB) — This external sensor is the most common cause of P0715 on the 3.8L Wrangler and is a simple replacement.
  Trusted brands: Mopar, Crown Automotive, Dorman, NTK
  OEM price range: $40-$70
  Aftermarket price range: $25-$50
• Transmission Electrical Connector Plug Adapter (for W5A580/NAG1) (OEM #68021352AA) — The O-rings on this connector sleeve fail, allowing transmission fluid to leak out and wick into the wiring harness. It should ALWAYS be replaced when the conductor plate is replaced.
  Trusted brands: Mopar, Febi, Dorman
  OEM price range: $15-$25
  Aftermarket price range: $10-$20

Related Codes That Often Appear With This One

• P0700 — P0700 is a generic code indicating the Transmission Control Module (TCM) has stored a fault. It almost always appears alongside a more specific transmission code like P0715.
• P0720 — This code relates to the Output Speed Sensor. On W5A580/NAG1 transmissions (2012-2017), both input and output speed sensors are on the same conductor plate, so they often fail together.
• P0717 — Indicates 'Input/Turbine Speed Sensor 'A' Circuit No Signal', a more specific version of P0715 pointing to a complete signal loss rather than an erratic one.

Mechanic-Grade Diagnostic Values

• Resistance of Input Speed Sensor (2007-2011 42RLE) — expected: ~700 Ohms for a good sensor.. Failure: A reading of ~500 Ohms may indicate a failing sensor, while an open circuit (infinite resistance) indicates a completely failed sensor.
• AC Voltage from Input Speed Sensor (2007-2011 42RLE) — expected: A fluctuating AC voltage that increases with speed (e.g., 1-3.5V).. Failure: Voltage dropping to near zero (e.g., 0.003V) when the fault occurs, even if the shaft is spinning.
• W5A580/NAG1 Solenoid Resistance (tested at TCM connector) — expected: Line Pressure: ~5.5Ω (Pins 38-36), 2-3 Shift: ~4.5Ω (Pins 38-16), 3-4 Shift: ~4.5Ω (Pins 38-15), TCC/Lockup: ~2.7Ω (Pins 38-17).. Failure: Readings significantly outside these ranges indicate a fault in the solenoid or conductor plate wiring.
• W5A580/NAG1 Speed Sensor Resistance (tested at TCM connector) — expected: Input (Turbine) Speed Sensor n2: ~4.7Ω (Pins 36-38 - Note: This seems to test the solenoid, not the sensor directly. The sensors themselves are harder to test this way and are usually condemned by live data).. Failure: An open or shorted reading. A zero or erratic RPM reading on a scan tool is the primary confirmation.

Scan Tool Commands That Help

• wiTECH (Jeep), STAR (Mercedes): Reset ETC Codes / Clear Transmission Adaptives — This is mandatory after replacing the conductor plate on a W5A580/NAG1 transmission. Failing to do so can leave the transmission in limp mode even with a new part installed.
• Professional Scan Tool: Transmission Quick Learn — After replacing the input speed sensor on a 42RLE transmission to force the TCM to relearn shift parameters with the new sensor's signal.

Wiring & Ground Locations

• TCM (Transmission Control Module) — For W5A580 models (2012-2017), located under the dashboard, below the steering column.. This is the termination point for the transmission harness. It must be checked for fluid contamination that wicks up from the 13-pin connector. It is also the location for remote-testing the conductor plate and solenoids.
• 13-Pin Connector (W5A580/NAG1) — On the front passenger side of the transmission housing.. This is the single point of electrical connection to the transmission. Its internal O-rings are a primary failure point, causing fluid leaks that can travel up the harness to the TCM.
• Input/Output Speed Sensors (42RLE) — On the driver's side of the transmission housing.. This is the location of the sensor itself for 2007-2011 models. The harness in this area should be inspected for damage or chafing against the engine.

Real Owner Repair Stories

• Reddit user in r/mercedes_benz (2005 Mercedes E500 (uses same W5A580/722.6 transmission)) — Stuck in limp mode with P0715 code.
  ❌ Tried (didn't work) Replacing the transmission conductor plate., Clearing codes with a scanner., Performing a transmission reset procedure.
  ✅ What actually fixed it The problem was likely transmission fluid that had wicked up the wiring harness into the Transmission Control Module (TCM) located in the passenger footwell. The suggested fix was to unplug the TCM and clean any fluid out of the connectors and module itself.
• CrossfireForum user (Chrysler Crossfire with under 30k miles (uses same W5A580/722.6 transmission)) — Intermittent P0715 code, getting stuck in limp mode.
  ❌ Tried (didn't work) Replacing the 13-pin connector O-rings to fix a fluid leak did not stop the code from returning.
  ✅ What actually fixed it The conductor plate was replaced. The technician noted that due to the low mileage, the speed sensor itself had not cracked, but there was poor electrical continuity on the internal contacts of the plate, which the new plate resolved.

"I Checked Everything" — The Actual Cause

• A common scenario for the W5A580 transmission is that the wiring harness near the transmission tests perfectly fine for continuity and shorts, but the P0715 code persists. The actual cause is often found at the other end of the harness, where transmission fluid has migrated all the way to the Transmission Control Module (TCM) under the dash, causing the fault there.

When the Usual Fixes Don't Work

• While replacing the conductor plate is the most common fix for P0715 on a 2012-2017 Wrangler, it is not a guaranteed solution. There are multiple documented cases on forums where the code returned after the repair. The most frequent reason for this is a failure to diagnose the entire circuit. The actual root cause was often found to be transmission fluid that had contaminated the Transmission Control Module (TCM) connectors under the dash, which required cleaning or replacement of the TCM itself to finally resolve the code.

OEM Part Supersession History

• 52108308AB → 52108308AC — Revision to improve reliability of the conductor plate electronics and sensor contacts.
• N/A → N/A — Design Variation
  Heads up: When replacing the W5A580 conductor plate, be aware of two designs: one with a 'U-shaped' dipstick guide hole and one with a round hole. Installing the incorrect version can lead to problems with accurately measuring the transmission fluid level.

Model Year Variations Within This Range

• 2012-2017: The major change occurred in 2012 with the switch from the 42RLE to the W5A580 transmission. Within the W5A580's run, minor related updates occurred. For example, in 2013, Jeep reportedly addressed an issue with automatic transmission fluid cooler lines rubbing through.

Diagnostic Flowchart

Other Known Issues on This Vehicle

Issues unrelated to this code that are worth knowing about as an owner of this generation:

• Front Axle 'Death Wobble' 🔴 High — Common, especially on lifted vehicles or after hitting a bump at speed. Caused by worn track bar bushings, ball joints, or steering damper.
• 3.8L EGH V6 Oil Consumption 🟠 Medium — Widespread issue, often starting around 50k-80k miles. Can be caused by piston ring design or PCV issues. Some owners report reduced consumption by switching to a heavier weight oil like 10W-30.
• 3.6L Pentastar Oil Cooler / Filter Housing Leak 🟠 Medium — Very common failure, typically between 70k-120k miles. The plastic housing, located in the engine valley, cracks and leaks oil or coolant.
• 3.6L Pentastar Rocker Arm/Lifter Tick 🔴 High — A known issue where failed rocker arm bearings cause a ticking noise and can lead to camshaft damage if ignored.
• Cracked Exhaust Manifolds (3.8L EGH V6) 🟡 Low — Common for the stock exhaust manifolds to develop cracks, causing an exhaust leak and a ticking sound, especially when cold.
• TIPM (Totally Integrated Power Module) Failure 🔴 High — The TIPM acts as the main fuse and relay box and is prone to internal failures, causing a wide range of difficult-to-diagnose electrical problems, from fuel pump issues to horn and wiper malfunctions.

Used vs. New Parts: Buying Guide for This Vehicle

When a used part is the smart pick: A used Transmission Control Module (TCM) can be a cost-effective option if the original is confirmed damaged by fluid and cannot be cleaned. A complete used valve body with conductor plate from a verified low-mileage donor vehicle is a possibility but carries significant risk, as the conductor plate is a known high-failure item.

Donor-vehicle mileage cap: roughly under 60000 miles for the part to have meaningful remaining life.

What to inspect on the donor part:

• Verify the donor vehicle's mileage.
• Inspect the 13-pin connector port on the transmission for any signs of fluid leakage or pin damage.
• If the pan is dropped, check for clean, red fluid with no burnt smell and an absence of excessive metal debris.

OEM-only on this vehicle (don't cheap out):

• Transmission Conductor Plate (W5A580/NAG1) - Strongly recommended to use Mopar or a known OE supplier like Siemens/VDO to avoid premature failure.
• 13-Pin Connector Sleeve (W5A580/NAG1) - The cost is low and the function is critical; use an OEM or OE-quality part (e.g., Febi) to ensure a proper seal.

Aftermarket brands forum-validated for this vehicle:

• NTK (for 42RLE speed sensors)
• Febi (for W5A580 connector sleeve and other related parts)
• Rostra (mentioned as an aftermarket supplier for conductor plates)

Brands owners have reported issues with on this vehicle:

• Unbranded, low-cost conductor plates from online marketplaces like eBay or Amazon are frequently reported by owners to have high rates of out-of-box or early failure.

Real Owner Stories

Aggregated from forums and TSBs cited above. Mileages and costs reflect what owners reported in those sources.

Related OBD-II Codes

• P0720 — Output Speed Sensor Circuit fault; often appears alongside P0715 because both sensors are housed on the same conductor plate in W5A580 models or are located near each other on 42RLE models.
• P0700 — A general Transmission Control System Malfunction code that often triggers when a specific fault like P0715 is detected by the TCM.
• P0717 — Input/Turbine Speed Sensor Circuit No Signal; closely related to P0715 and often caused by the same conductor plate hairline cracks or sensor failure.

Frequently Asked Questions