P2764 on 2013-2020 Jeep Wrangler: TCC Solenoid Circuit Low Causes and Fixes

What's Unique About the 2013-2020 Jeep WRANGLER

The 2013-2020 Wrangler spans two generations, the JK (to 2018) and the JL (from 2018). JKs primarily use the Mercedes-designed W5A580 5-speed automatic, also known as the NAG1. JLs use the ZF-designed 850RE 8-speed, which is Chrysler's version of the ZF 8HP50. While the code's meaning is the same for both, the physical location and common failure points differ. The W5A580 is infamous for issues with its conductor plate and the 13-pin electrical connector leaking fluid. Some early JLs experienced transmission issues, including valve body problems, that could lead to similar codes.

Diagnostic Flowchart

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

Generation note: The 2013-2020 period covers the Jeep Wrangler JK (2013-2018) and the JL (2018-2020). The JK models with an automatic transmission use the W5A580 (NAG1) 5-speed. The JL models use the 850RE 8-speed automatic. While the P2764 code applies to both, the specific parts (e.g., conductor plate vs. individual solenoid) and repair procedures will differ significantly between these two transmissions.

Symptoms You May Notice

• Check Engine Light is on.
• Transmission shifts harshly, erratically, or with a noticeable clunk.
• Vehicle shudders or vibrates, especially during light acceleration when the torque converter should be locking up.
• Engine RPMs are higher than usual at highway speeds (torque converter not locking up).
• Decreased fuel economy.
• Transmission may feel like it's slipping.
• Vehicle may stall when coming to a stop.
• Transmission may enter 'limp mode', getting stuck in one gear.

Most Likely Causes

1. Faulty Torque Converter Clutch (TCC) Solenoid / Conductor Plate 🔴 High Probability → Shop Automatic Transmission Torque Converter On the W5A580 (JK), the solenoids are integrated into a conductor plate that sits in hot transmission fluid. Heat cycles and fluid contamination cause the delicate electronics and plastic to fail over time. This is a very common failure point for this transmission.
   How to confirm: A technician can use a diagnostic scan tool to command the TCC solenoid on and off to check its operation. The solenoid's internal resistance can also be tested with a multimeter at the transmission's 13-pin connector or directly at the solenoid after removing the transmission pan.
   Typical fix: For the W5A580 (JK), the entire conductor plate assembly is typically replaced. 🎬 Watch: Step-by-step guide to replacing the conductor plate and solenoids. For the 850RE (JL), the individual TCC solenoid may be replaceable, but it is often serviced as part of the complete valve body assembly.
   Est. part cost: $150-$400
2. Wiring or Connector Issues 🟡 Medium Probability The W5A580 (JK) transmission has a 13-pin electrical connector that is notorious for leaking. The O-rings fail, allowing transmission fluid to seep into the connector, causing short circuits. In some cases, fluid can wick all the way up the wiring harness to the Transmission Control Module (TCM), causing widespread issues.
   How to confirm: Visually inspect the external 13-pin transmission connector (on the W5A580) for any signs of ATF leakage. Disconnect it and check for fluid inside the plug. Test for continuity and proper voltage at the solenoid connector inside the transmission pan.
   Typical fix: Replace the 13-pin connector housing and its O-rings. 🎬 See how to replace the leaking 13-pin wiring adapter plug. If the harness is saturated with fluid, it may need extensive cleaning or replacement. The connector itself is an inexpensive part.
   Est. part cost: $20-$250
3. Low or Contaminated Transmission Fluid 🟡 Medium Probability → Shop Transmission Assembly Wranglers are often used off-road, increasing the risk of pan damage and fluid leaks. More importantly, old, degraded fluid loses its hydraulic properties and can contain abrasive particles that clog the tiny passages in the valve body and solenoids, causing them to stick or fail.
   How to confirm: Check the transmission fluid level and condition. On these models, this is a complex procedure as there is no dipstick; it must be checked via a fill plug at a specific temperature. Burnt-smelling or dark, debris-filled fluid indicates a problem.
   Typical fix: Perform a transmission fluid and filter change. 🎬 Watch: How to change your transmission fluid and filter properly. If the fluid is heavily contaminated, a full flush may be needed, though some manufacturers advise against power flushing.
   Est. part cost: $100-$250
4. Faulty Valve Body ⚪ Low Probability → Shop Transmission Valve Body
   How to confirm: This is typically diagnosed after the solenoid, wiring, and fluid have been confirmed to be good. Debris or sludge in the valve body can cause solenoids to stick or malfunction. On the JL (850RE), valve body issues have been reported by owners, sometimes causing harsh clunking when stopping and accelerating.
   Typical fix: Clean or replace the entire transmission valve body. On the JL, some owners have had the valve body replaced under warranty to fix shifting issues.
   Est. part cost: $500-$1200

Rare But Worth Checking

• Faulty Transmission Control Module (TCM) or Powertrain Control Module (PCM): → Shop Transmission Assembly This is the least likely cause. The module itself can fail, but all other possibilities should be exhausted before replacing the TCM/PCM, as it is expensive and often requires programming. A fluid-wicking issue from the 13-pin connector on the W5A580 can damage the TCM.

Diagnosis Steps

1. Verify the transmission fluid level and condition. This must be done with the vehicle level and the transmission at a specific operating temperature (e.g., 86-122°F for the 850RE).
2. Use a professional scan tool to check for any other transmission-related codes and to view live data from the transmission sensors.
3. Attempt to command the TCC solenoid on and off with the scan tool to check for a response.
4. For W5A580 (JK): Inspect the 13-pin transmission wiring harness connector for any signs of fluid intrusion. This is a primary suspect.
5. Safely raise the vehicle, drain the transmission fluid, and remove the oil pan.
6. Visually inspect the internal wiring, solenoids, and valve body for any obvious damage or debris.
7. Using a multimeter and a wiring diagram, test the resistance of the TCC solenoid and check for proper voltage and ground at its connector. A healthy solenoid should have a specific resistance value (e.g., around 2.0-4.0 ohms for a NAG1).
8. If the solenoid and wiring test good, the issue may lie within the valve body or the TCM itself.

Parts You'll Likely Need

• Transmission Conductor Plate (for W5A580) (OEM #52108308AC) — On the 5-speed W5A580 transmission used in the JK, the solenoids and speed sensors are integrated into a single 'conductor plate' which is a very common failure item.
  Trusted brands: Mopar, Bosch, APDTY
  OEM price range: $250-$400
  Aftermarket price range: $150-$250
• TCC Solenoid (for 850RE) — On the 8-speed 850RE in the JL, individual solenoids can sometimes be replaced, though they are often sold as part of a complete valve body assembly. Finding individual OEM solenoids can be difficult.
  Trusted brands: Mopar, ZF
  OEM price range: $100-$200
  Aftermarket price range: $70-$150
• Transmission Electrical Connector (13-pin for W5A580) (OEM #68021352AA) — This connector's O-rings fail, causing fluid leaks that disrupt the electrical signals to the transmission. It's a cheap part and should be replaced whenever the conductor plate is serviced.
  Trusted brands: Mopar
  OEM price range: $20-$40
  Aftermarket price range: $15-$30
• Transmission Filter and Pan Gasket Kit — These parts must be replaced any time the transmission pan is removed for service.

Related Codes That Often Appear With This One

• P0740 — This code also relates to the Torque Converter Clutch system, indicating a general malfunction, and often appears alongside more specific circuit codes like P2764.
• P0717 — This code for a Turbine/Input Shaft Speed Sensor Circuit No Signal can be triggered on W5A580 transmissions because the speed sensors are integrated into the same conductor plate that houses the solenoids. A failing plate can cause both codes.
• P0700 — This is a generic transmission fault code stored in the PCM, which simply indicates that a more specific code (like P2764) is stored in the Transmission Control Module (TCM).

Technical Service Bulletins (TSBs) & Recalls

• POWER TRAIN TSB: This TSB applies to vehicles with a 62TE transmission, not the Wrangler's W5A580 or 850RE. However, it contains a relevant diagnostic principle: 'If vehicle is jerking/slipping with MIL code(s) P0740 or P2764, check TCC Solenoid operation. If TCC Solenoid is ok, the codes are indicative of a torque converter failure. Replace the torque converter.' This reinforces the need to test the solenoid circuit before condemning the more expensive torque converter.

Platform-Specific Known Issues

• Wrangler JK (W5A580): Conductor Plate and Connector Leak: On the Wrangler JK with the W5A580 transmission, the most common cause for P2764 is a failure of the electrical conductor plate. A related and often concurrent issue is a leak from the 13-pin electrical connector, which can saturate the wiring and cause the same code. Owners on forums like jk-forum.com often report going into limp mode, with the fix being a new conductor plate, connector, and fluid change.
• Wrangler JL (850RE): Valve Body Concerns: → Shop Transmission Valve Body For the Wrangler JL with the 850RE 8-speed, while less common, this code can point towards a faulty solenoid within the valve body assembly. Some owners of early JLs have reported harsh shifting, clunks when stopping, and other transmission irregularities that were resolved by the dealer replacing the entire valve body under warranty. A thread on jlwranglerforums.com discusses a valve body failure causing jerking and clunking, which are symptoms that can accompany solenoid circuit codes.

Mechanic-Grade Diagnostic Values

• TCC Solenoid Resistance (W5A580/NAG1) — expected: 2.0 to 4.0 ohms. Failure: A reading outside this range indicates a faulty solenoid.
• TCC Solenoid Supply Voltage — expected: Approximately 12V (+/- 0.5V) with ignition on. Failure: Voltage below 9V indicates a low-voltage condition in the circuit upstream of the solenoid.

Scan Tool Commands That Help

• wiTECH or equivalent professional scanner: Quick Learn / Transmission Adaptation Reset — This function should be used after replacing major transmission components like the valve body or conductor plate. It clears the learned shift adaptations and forces the TCM to relearn shift points, which can resolve harsh or incorrect shifting.
• wiTECH or equivalent professional scanner: TCC Solenoid Activation Test — This is a bidirectional control that allows a technician to command the TCC solenoid on and off while monitoring the circuit's response. It helps determine if the solenoid is mechanically stuck or if the electrical circuit is failing to respond to TCM commands.

Wiring & Ground Locations

• G100 / G103 — On the right side of the engine compartment in a JK Wrangler.. These are primary engine bay grounds. A poor connection at these points can cause stray voltage and intermittent electrical issues for various components, including the transmission control system.
• G101 / G104 — Located at the rear of the engine on a JK Wrangler, sometimes near the catalytic converter heat shield.. These grounds are directly on the engine block. Since the transmission is bolted to the engine, a solid engine ground is critical for the proper function of all transmission sensors and solenoids.
• Transmission Control Module (TCM) - JK Models — Located inside the cabin, behind the dashboard's lower knee bolster, to the right of the steering column. It is mounted vertically.. Knowing the physical location is essential for testing the solenoid circuit directly at the module's connectors, which is a key step in diagnosing if the fault is in the wiring, the solenoid, or the TCM itself.

OEM Part Supersession History

• 52108308AB → 52108308AC — Part revision or update by the manufacturer.
  Heads up: The new part number (52108308AC) is the correct replacement for the older version and should be used for service.