P0706 on 2007-2018 Jeep Wrangler: Transmission Range Sensor Causes and Fixes

What's Unique About the 2007-2018 Jeep Wrangler

The 2007-2018 Jeep Wrangler JK generation used two different automatic transmissions, which critically changes the location and repair of the Transmission Range Sensor. Wranglers from 2007-2011 with the 4-speed 42RLE transmission have an external TRS that is relatively easy to access and replace, using ATF+4 fluid. For 2012-2018 Wranglers with the 5-speed W5A580 (NAG1) transmission, the sensor is internal, integrated into the conductor plate (valve body electronics). This repair requires removing the transmission pan and valve body and uses a specific fluid meeting Shell ATF 3353 or Mopar ATF+4 specification (MB 236.14). A common failure point on the NAG1 is the 13-pin electrical connector plug, which can leak fluid and should be replaced during the service.

Generation note: The 2007-2018 model years cover the Jeep Wrangler 'JK' generation. However, there is a critical split in automatic transmissions: the 2007-2011 models use the 42RLE 4-speed, and the 2012-2018 models use the W5A580 (NAG1) 5-speed. The location and replacement procedure for the Transmission Range Sensor are completely different between these two transmissions.

Symptoms You May Notice

• Check Engine Light is on
• Vehicle will not start, or only starts in Neutral
• Transmission is stuck in one gear ('limp mode')
• Harsh or delayed shifting between gears
• Incorrect gear selection displayed on the dashboard
• PRNDL indicator on the dash may be blank, boxed out, or flashing

Most Likely Causes

1. Faulty Transmission Range Sensor (TRS) / Conductor Plate 🔴 High Probability → Shop Transmission Assembly On 42RLE models, the external sensor is exposed to weather, road grime, and water from off-roading, leading to corrosion and failure. On W5A580 (NAG1) models, the internal conductor plate is a known failure item across all Chrysler/Mercedes platforms using this transmission, with the plastic and electronics becoming brittle over time.
   How to confirm: Use a scan tool to monitor live data for 'TRS Voltage' or 'Shifter Position' while moving the lever. The reading should change smoothly and correspond to each gear. Any jumps, dropouts, or irrational values indicate a fault. On NAG1 models, also inspect the 13-pin electrical connector at the transmission for fluid leakage, which is a tell-tale sign of a failing connector seal that often accompanies conductor plate issues.
   Typical fix: For 2007-2011 (42RLE), replace the external Transmission Range Sensor. 🎬 Watch: How to replace the external range sensor For 2012-2018 (NAG1), replace the internal conductor plate, 🎬 See this NAG1 conductor plate removal walkthrough the 13-pin connector plug adapter, 🎬 Watch: How to replace the plug adapter and fluid the filter, and the pan gasket. Refill with the correct fluid.
   Est. part cost: $35 - $250
2. Damaged Wiring or Corroded Connector 🟡 Medium Probability The wiring harness to the transmission is routed near the exhaust and is susceptible to damage from heat, debris, and flexing during off-road articulation. On NAG1 models, a leaking 13-pin connector can cause transmission fluid to wick up the wiring harness, sometimes as far as the TCM, causing shorts and corrosion.
   How to confirm: Visually inspect the wiring harness for chafing, melting, or breaks. Disconnect the main transmission connector and check for green/white corrosion or bent pins. On NAG1 models, specifically check for ATF inside the connector plug itself.
   Typical fix: Repair the damaged section of wire. Clean corroded terminals with electrical contact cleaner. If the connector is damaged or filled with fluid (on NAG1), it must be replaced.
   Est. part cost: $10 - $75
3. Misadjusted Transmission Range Sensor or Shift Linkage ⚪ Low Probability → Shop Transmission Assembly
   How to confirm: With the vehicle safely supported, have a helper move the shifter while you observe the lever on the transmission. Ensure it moves to each detent crisply. Check if the shift cable is loose, stretched, or if the mounting bracket is bent. On 42RLE models, the sensor itself can be rotated slightly for adjustment.
   Typical fix: Adjust the shift cable at the transmission lever to ensure proper alignment. On 42RLE models, loosen the sensor's mounting bolts, align it correctly (ensure it starts in P and N only), and retighten.
   Est. part cost: $0 - $20

Rare But Worth Checking

• Faulty Powertrain Control Module (PCM) or Transmission Control Module (TCM): → Shop Transmission Assembly This is very rare and should only be considered after all other possibilities are exhausted. A user on JK-Forum.com noted that after chasing multiple O2 sensor codes and P0706, a PCM replacement was the final solution. Another user noted a P0706 code after installing an aftermarket performance chip, suggesting software conflicts can trigger it.

Diagnosis Steps

1. Connect an OBD-II scanner and confirm P0706 is present. Note any other codes, especially P0700 or P0705.
2. Check the transmission fluid level and condition. For the 42RLE (2007-2011), use the dipstick. For the W5A580/NAG1 (2012-2018), this requires a special service dipstick tool as there is no factory-installed one.
3. Visually inspect the entire wiring harness leading to the transmission. Look for physical damage, melting near the exhaust, or corrosion.
4. For 2012-2018 models (NAG1), disconnect the 13-pin connector on the passenger side of the transmission. Inspect for any signs of red transmission fluid inside the plug. If fluid is present, the connector plug and likely the conductor plate are faulty.
5. Using a scan tool with live data, monitor the TRS voltage/position while slowly moving the shifter through all gears. The data should show a clear, distinct value for each gear position (P, R, N, D). Erratic readings, dropouts, or illogical values point to a bad sensor/conductor plate or wiring.
6. If the signal is faulty, and you have a 42RLE (2007-2011), proceed with testing the external sensor with a multimeter. If you have a NAG1 (2012-2018) and the connector is dry, the conductor plate is the primary suspect.
7. Check the mechanical shift linkage. Ensure the cable is securely attached at both the shifter and the transmission lever and is not stretched or binding.
8. If the sensor, wiring, and linkage all test good, consider the rare possibility of a faulty TCM or PCM.

Parts You'll Likely Need

• Transmission Range Sensor (for 2007-2011 42RLE) (OEM #4659677AC) — This external sensor is the most common failure point for the P0706 code on early JK Wranglers with the 42RLE transmission.
  Trusted brands: Mopar, Duralast, Crown Automotive
  OEM price range: $80-$110
  Aftermarket price range: $35-$60
• Transmission Conductor Plate (for 2012-2018 W5A580/NAG1) (OEM #52108308AC) — On later JK Wranglers with the NAG1 transmission, the range sensor is integrated into this internal plate. The entire plate must be replaced to fix a faulty sensor. This is a very common failure item.
  Trusted brands: Mopar, Bosch, Vaico
  OEM price range: $200-$300
  Aftermarket price range: $150-$220
• Transmission Electrical Connector Plug Adapter (for 2012-2018 W5A580/NAG1) (OEM #68021352AA) — This connector's O-rings fail, allowing ATF to leak out of the transmission and into the electrical connection, causing shorts. It is considered a mandatory replacement part when servicing the conductor plate.
  Trusted brands: Mopar, Febi, Bosch
  OEM price range: $25-$50
  Aftermarket price range: $10-$20

Related Codes That Often Appear With This One

• P0700 — P0700 is a generic code indicating that the Transmission Control Module (TCM) has stored a fault. It is a 'gateway' code that almost always appears alongside more specific transmission codes like P0706.
• P0705 — This code indicates a general malfunction in the Transmission Range Sensor circuit, which is the same component responsible for the P0706 performance fault. Seeing them together strongly points to the sensor or its wiring.

Platform-Specific Known Issues

• NAG1 Conductor Plate and Connector Leak: A user on a forum reported that their 2013 Wrangler was stuck in limp mode with a P0706 code. The issue was a leaking 13-pin connector that had saturated the harness, causing a short. Replacing the conductor plate, the connector plug, and cleaning the harness resolved the issue.

Mechanic-Grade Diagnostic Values

• 42RLE Transmission Range Sensor (TRS) Switch States — expected: The PCM decodes a combination of open/closed states from four circuits (T1, T3, T41, T42). For Park, all are closed except T1. For Neutral, all are closed except T3. For Overdrive, only T1 is closed. Any other combination for more than 0.042 seconds is considered invalid.. Failure: A scan tool showing an 'Invalid PRNDL code' or a combination of switch states that does not match the chart for any gear position.
• NAG1 (W5A580) Valve Body Bolt Torque — expected: 71 in-lbs (5.9 ft-lbs or 8 Nm). Failure: N/A - This is a reassembly specification.
• NAG1 (W5A580) Transmission Fluid Level Check Temperature — expected: The fluid level must be checked when the transmission fluid is at operating temperature, approximately 175-180°F.. Failure: An incorrect fluid level reading (either too high or too low) if checked at the wrong temperature, which can cause shifting problems.

Scan Tool Commands That Help

• Chrysler/Jeep Dealer Scan Tool (e.g., WiTech): Shift Lever Position Test — For the 42RLE transmission, this test helps verify if the PCM is receiving the correct sequence of switch states from the Transmission Range Sensor as the shifter is moved.
• Chrysler/Jeep Dealer Scan Tool (e.g., WiTech): TCM Reprogramming/Flash — In cases where no physical fault can be found with the sensor or wiring, an outdated software version in the Transmission Control Module (TCM) can cause false or intermittent P0706 codes. A TSB may be available to update the software to improve fault logic.

Wiring & Ground Locations

• 42RLE TRS Sense Circuits — At the 60-way PCM connector (C4, Green). T1 is Pin 15, T3 is Pin 16, T41 is Pin 27, and T42 is Pin 37.. These are the specific pins at the Powertrain Control Module that receive the gear position signals from the Transmission Range Sensor. A technician can test for continuity or voltage at these pins to isolate a wiring fault between the sensor and the PCM.
• NAG1 13-Pin Connector — On the passenger side of the transmission housing, near the front.. This is the single point of electrical connection for the internal conductor plate. It is notoriously prone to leaking ATF, which wicks into the connector and harness, causing shorts and communication errors that trigger P0706. Inspecting this connector for fluid is a critical first diagnostic step.

Real Owner Repair Stories

• JK-Forum.com user (Jeep JK Wrangler Rubicon w/ Automatic) — Intermittent Check Engine Light, initially with O2 sensor codes (P0032, P0038, P0052, P0058), later adding P0706 (Transmission Range Sensor Rationality).
  ❌ Tried (didn't work) Dealer planned to replace an O2 sensor, but the part was backordered.
  ✅ What actually fixed it The user noted that for similar issues seen on the forum, the only repair that seemed to work was a complete replacement of the Powertrain Control Module (PCM).

OEM Part Supersession History

• 52108308AB → 52108308AC — Revision and update to the part.
  Heads up: The new part number (52108308AC) is the correct replacement for the older version for the NAG1 conductor plate.
• Multiple (5189122AA, 52108323AB, etc.) → 68021352AA — Consolidation and revision of the part design.
  Heads up: 68021352AA is the current and widely used replacement for the NAG1 13-pin connector plug adapter, superseding several older numbers.

Model Year Variations Within This Range

• 2007-2011: These models use the 4-speed 42RLE transmission with an external, easily accessible Transmission Range Sensor (PN 4659677AC). Diagnosis focuses on the external sensor and its wiring.
• 2012-2018: These models use the 5-speed W5A580 (NAG1) transmission. The range sensor is internal, integrated into the conductor plate (PN 52108308AC). Diagnosis is more involved, requiring inspection of the 13-pin connector for leaks and often leading to removal of the transmission pan and valve body.

Diagnostic Flowchart

Other Known Issues on This Vehicle

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

• Death Wobble 🔴 High — Common across all JK model years, especially after hitting a bump at speeds over 45 mph. Caused by worn front-end components like the track bar, ball joints, or tie rod ends.
• Cracked Oil Filter Housing Assembly (3.6L Pentastar) 🔴 High — Extremely common on 2012-2018 models. The factory plastic housing becomes brittle from heat cycles and cracks, causing major oil and/or coolant leaks into the engine valley. (Ref: No recall has been issued, but the failure is widely documented.)
• Cracked Exhaust Manifold (3.8L V6) 🟠 Medium — Common on 2007-2011 models. The cast-iron manifolds are prone to cracking from thermal stress, causing an exhaust leak, ticking noise, and potentially setting O2 sensor or catalyst codes.
• Totally Integrated Power Module (TIPM) Failure 🔴 High — Common on earlier JK models (approx. 2007-2014). Can cause a wide range of bizarre electrical issues, including fuel pump failure, horn honking randomly, wipers activating, and engine stalling.
• Water Leaks 🟡 Low — A persistent issue for many JK owners, with water entering through door seals, freedom top panels, or the A-pillar, often resulting in wet carpets.
• Airbag Clockspring Failure 🟠 Medium — Common on 2007-2012 models, leading to an airbag warning light and loss of function for the horn and steering wheel controls. (Ref: Covered under an extended warranty (X56/NHTSA 14V-438) for some vehicles.)

Used vs. New Parts: Buying Guide for This Vehicle

When a used part is the smart pick: For this specific repair, using used parts is generally not recommended. The key components are either wear items or electronics with a known failure rate. A used wiring harness section for a repair might be acceptable if it is in excellent condition.

Donor-vehicle mileage cap: roughly under 50000 miles for the part to have meaningful remaining life.

What to inspect on the donor part:

• For a wiring harness, inspect for any signs of cracking, melting, or previous repairs.
• Ensure all connector locking tabs are intact and not brittle.
• Avoid parts from vehicles in rust-belt states or those with obvious signs of heavy off-road use or water immersion.

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

• Transmission Conductor Plate (NAG1)
• Transmission Control Module (TCM/PCM)

Aftermarket brands forum-validated for this vehicle:

• Dorman (for conductor plate, often cited as a viable alternative)
• Bosch (often an OEM supplier for European-derived parts like the NAG1 components)
• Febi (for the 13-pin connector plug)

Brands owners have reported issues with on this vehicle:

• Unnamed, no-brand electronic components from online marketplaces should be avoided, as quality control is a major concern for sensitive electronics like the conductor plate.

Real Owner Stories

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

Related OBD-II Codes

• P0700 — A general transmission control system malfunction code that often accompanies P0706 when the TCM requests Check Engine Light illumination.
• P0705 — Transmission Range Sensor Circuit Malfunction; frequently appears alongside P0706 when there is a total circuit failure or short in the TRS wiring.

Frequently Asked Questions