P2764 on 2005-2012 Jeep Grand Cherokee: Causes and Fixes for the TCC Solenoid Circuit

What's Unique About the 2005-2012 Jeep GRAND CHEROKEE

The 2005-2012 Grand Cherokee spans two generations (WK and early WK2) and used several different transmissions. Many models, especially those with V8 engines and early Pentastar V6s, were equipped with the Mercedes-designed W5A580 (also called NAG1) five-speed automatic. This specific transmission is well-known for failures of its electrical conductor plate, which houses all the solenoids and speed sensors. This single part is a very frequent cause for codes like P2764, often leading to a misdiagnosis of a more expensive torque converter or full transmission failure. Other models used the 545RFE/65RFE transmission, where the solenoid pack is the common failure point.

Diagnostic Flowchart

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

Generation note: This range covers the third generation (WK, 2005-2010) and the start of the fourth generation (WK2, 2011-2012). The WK models used the W5A580/NAG1 or 545RFE transmissions. Early WK2 models used the W5A580 or the 65RFE. The diagnosis for this code is similar across these transmissions, but the specific part that needs replacing (conductor plate vs. solenoid pack) differs.

Symptoms You May Notice

• Check Engine Light is on.
• Transmission may enter a "limp mode," typically stuck in 2nd gear.
• Harsh, erratic, or delayed gear shifts.
• Vehicle may stall when coming to a stop.
• A shudder or vibration, especially between 35-50 mph as the TCC tries to engage.
• Engine RPMs are higher than usual at cruising speeds (torque converter not locking up).
• Feeling of 'slipping' where engine RPMs climb but vehicle speed does not increase proportionally.
• Decreased fuel economy.

Most Likely Causes

1. Faulty Transmission Conductor Plate (W5A580/NAG1 Models) 🔴 High Probability → Shop Transmission Assembly The conductor plate in the Mercedes-built W5A580 transmission is a known high-failure item. The plastic housing and integrated electronics become brittle and fail over time, causing a variety of electrical faults, including shorts and open circuits for the solenoids and speed sensors.
   How to confirm: After confirming external wiring is intact, the valve body must be removed to inspect and test the conductor plate. Often, this part is replaced preventatively when the valve body is removed for solenoid issues. Other codes like P0717 (Input Speed Sensor) often accompany a conductor plate failure.
   Typical fix: Replace the conductor plate, 13-pin connector plug adapter, filter, and fluid. The connector plug is almost always replaced at the same time due to its tendency to leak.
   Est. part cost: $150-$300
2. Faulty TCC Solenoid or Solenoid Pack (RFE Models) 🔴 High Probability → Shop Transmission Valve Body On the 545RFE and 65RFE transmissions, the TCC solenoid is part of a larger solenoid block. Like any electronic component, these solenoids can fail electrically or become clogged with debris from normal wear.
   How to confirm: Using a scan tool, command the TCC solenoid on/off and monitor its circuit voltage. If the command is sent but the circuit remains low, and wiring is good, the solenoid is likely faulty. Resistance can also be checked with a multimeter across the solenoid's pins; it should be around 1.3 ohms.
   Typical fix: Replace the entire transmission solenoid block/pack, along with the filter(s) and fluid.
   Est. part cost: $250-$450
3. Damaged Wiring or Leaking Connector 🟡 Medium Probability On W5A580/NAG1 models, the 13-pin electrical connector is famous for leaking transmission fluid. The fluid can wick up the wiring harness into the TCM, causing short circuits or poor connections far from the transmission itself.
   How to confirm: Visually inspect the main transmission electrical connector for any signs of fluid (red or brown oil). Unplug the connector and check for fluid inside the pins on both the transmission side and the harness side. Check the wiring harness for any chafing, melting, or corrosion.
   Typical fix: Replace the 13-pin connector plug adapter (a common and inexpensive part) and thoroughly clean the harness connectors with electrical contact cleaner. Repair any damaged wires.
   Est. part cost: $15-$50
4. Low or Contaminated Transmission Fluid ⚪ Low Probability → Shop Transmission Assembly While not unique to this vehicle, the W5A580 is noted to be very sensitive to fluid quality and level. Contaminated fluid can cause solenoids to stick or operate slowly.
   How to confirm: Check the transmission fluid level and condition according to the manufacturer's procedure. Fluid should be at the correct level, bright red, and not smell burnt. Dark or debris-filled fluid indicates a problem.
   Typical fix: Perform a transmission fluid and filter change. If the fluid is heavily contaminated, a more significant repair may be needed.
   Est. part cost: $100-$200
5. Faulty Transmission Control Module (TCM) ⚪ Low Probability → Shop Transmission Assembly
   How to confirm: This is a diagnosis of last resort. If the solenoid, conductor plate, and all wiring have been tested and confirmed to be good, the TCM may be the issue. This is especially suspected if fluid has wicked up the harness from a leaking connector on a NAG1 model.
   Typical fix: Replace and reprogram the TCM.
   Est. part cost: $400-$800

Diagnosis Steps

1. Check and record any and all fault codes stored in the TCM and PCM.
2. Check the transmission fluid level and condition. Note that many of these models do not have a traditional dipstick and require a special tool.
3. Visually inspect the main transmission electrical harness connector for damage or fluid leaks, especially the 13-pin connector on W5A580/NAG1 models.
4. Using a bidirectional scan tool, monitor the voltage of the TCC solenoid circuit while commanding it on and off. A reading that stays low indicates a circuit problem.
5. If external wiring appears good, drop the transmission oil pan to gain access to the internal components.
6. Visually inspect the internal wiring for any obvious damage.
7. Depending on the transmission model, test the resistance of the TCC solenoid. For W5A580 models, this is done at the conductor plate connector. For RFE models, this is done at the solenoid pack connector. A healthy solenoid should read approximately 1.3 ohms.
8. If tests point to an internal component, replace the faulty part (conductor plate or solenoid pack), along with the transmission filter, pan gasket, and the appropriate type of new fluid.

Parts You'll Likely Need

• Transmission Conductor Plate Kit (W5A580/NAG1) (OEM #52108308AC (Mopar), 1402701261 (Mercedes)) — This is the most common failure point on the Mercedes 5-speed transmission that causes this code.
  Trusted brands: Mopar, Vaico, Febi, Dorman (917-679)
  OEM price range: $250-$350
  Aftermarket price range: $120-$200
• Transmission Solenoid Pack (545RFE/65RFE) (OEM #52119435AF (Mopar, updated white connector)) — For RFE series transmissions, the TCC solenoid is integrated into this pack, which is the most common part to fail and cause this code. This is the updated part number replacing older versions with grey or black connectors.
  Trusted brands: Mopar, Rostra, Sonnax
  OEM price range: $400-$500
  Aftermarket price range: $250-$350
• Transmission Filter and Gasket Kit — Must be replaced any time the transmission pan is removed for service. RFE models have two filters.
  Trusted brands: Mopar, ATP, Wix
  OEM price range: $50-$80
  Aftermarket price range: $20-$40

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 P2764.
• P0740 — This code also relates to the Torque Converter Clutch circuit. Seeing both codes together strongly points to a failure in the TCC solenoid or its related wiring/control components.
• P0717 — On W5A580/NAG1 models, this code for Input/Turbine Speed Sensor Circuit No Signal is a strong indicator of a failed conductor plate, as the speed sensors are integrated into it.

Technical Service Bulletins (TSBs) & Recalls

• While TSB #9004009 was provided, it applies to vehicles with the 62TE transmission and is not relevant to the 2005-2012 Grand Cherokee, which did not use this transmission.

Platform-Specific Known Issues

• W5A580 / NAG1 Transmission Specifics: → Shop Transmission Assembly Found with 3.0L Diesel, 3.6L V6, 5.7L V8, and 6.1L V8 engines. The primary failure is the conductor plate, which holds the electronics. When replacing it, it is critical to also replace the 13-pin electrical connector sleeve (Part # 68021352AA or equivalent) as it is the source of common fluid leaks that damage the electronics.
• 545RFE / 65RFE Transmission Specifics: → Shop Transmission Assembly Found with 3.7L V6, 4.7L V8, and some 5.7L V8 engines. The primary failure is the solenoid pack. This transmission also has two filters (a spin-on filter and a sump filter) that should both be changed during the service.

Mechanic-Grade Diagnostic Values

• TCC Solenoid Resistance (545RFE/65RFE Models) — expected: ~1.3 Ohms. Failure: A reading that is significantly higher (open circuit) or lower (short circuit) than 1.3 Ohms indicates a faulty solenoid.
• TCC Solenoid Resistance (W5A580/NAG1 Models) — expected: ~2.5 - 5.0 Ohms (cold). Failure: Readings outside of the specified range suggest a failure in the solenoid, which is part of the conductor plate assembly.
• RFE Solenoid Pack Connector Pinout Test — expected: Resistance of ~1.3 Ohms between Pin 10 (Transmission Control Relay Output) and Pin 2 (Low/Reverse & TCC Solenoid Control).. Failure: An open or shorted reading points to a failure in the solenoid pack or internal wiring.

Scan Tool Commands That Help

• Professional Bidirectional Scanner (e.g., wiTECH, Autel): TCC Solenoid Activation Test / Actuation Test — This command allows the technician to manually turn the TCC solenoid on and off while monitoring circuit voltage and listening for a physical 'click' from the solenoid. If the command is sent but the voltage doesn't change or no click is heard, it strongly suggests a fault in the solenoid or its wiring.
• Professional Bidirectional Scanner (e.g., wiTECH, Autel): Quick Learn / Transmission Adaptation Reset — This procedure must be performed after replacing a solenoid pack or conductor plate. It allows the TCM to learn the hydraulic and electrical characteristics of the new components to ensure proper shift quality and TCC operation.

Wiring & Ground Locations

• G102 / G103 — On the engine block, typically on the passenger side near the motor mount and behind the PCM for V8 models.. These are primary grounds for the PCM and various transmission sensors. A poor connection at these points can cause erratic sensor readings and incorrect command signals from the PCM/TCM, potentially triggering false circuit codes.
• G108 — On the passenger side inner fender, near the power distribution block.. This ground serves multiple components, including the Transmission Control Module (TCM) on some configurations. A corroded or loose G108 can lead to low voltage conditions for the entire TCM, causing various transmission codes, including P2764.
• RFE Solenoid Pack Connector — External connector on the driver's side of the 545RFE/65RFE transmission case.. This is the primary point for testing the TCC solenoid circuit externally. Pin 10 is the power feed from the control relay, and Pin 2 is the control circuit for the LR/TCC solenoid.
• NAG1 13-Pin Connector — External round connector on the front passenger side of the W5A580/NAG1 transmission case.. This connector is the main interface to the conductor plate and is notorious for leaking fluid. Fluid wicking up the harness from this connector is a common cause of TCM and circuit faults.

Real Owner Repair Stories

• JeepForum.com user (2006 Jeep Grand Cherokee with 5.7L Hemi (545RFE transmission)) — Check engine light on, transmission in limp mode (stuck in one gear), harsh engagement into Drive.
  ❌ Tried (didn't work) The user initially suspected a major transmission failure.
  ✅ What actually fixed it The user replaced the transmission solenoid pack (also called the solenoid block). After replacement and clearing the codes, the transmission returned to normal operation.

OEM Part Supersession History

• 5170877AA (Black or Grey Connector) → 52119435AF (White Connector) — The white connector solenoid pack is an updated, more robust design that replaces all previous versions for the RFE series transmissions.
  Heads up: When updating a 1999-2003 vehicle from the original black connector solenoid pack to the white connector version, the transmission range sensor plate (TRS cam plate) must also be replaced to the newer style to ensure compatibility.
• 52108308AB → 52108308AC — Minor revision to the NAG1/W5A580 conductor plate.
  Heads up: These parts are generally interchangeable. The Mercedes-Benz part number is 1402701261.

Model Year Variations Within This Range

• 1999-2003 (Pre-dates range but relevant for parts): Early RFE transmissions used a black connector solenoid pack. While the 2005-2012 range uses a white or grey connector from the factory, it's important to know that if a transmission was replaced with an older unit, it might have the black connector. Upgrading to the modern white connector solenoid pack requires changing the TRS plate as well.
• 2009-2011: Some RFE transmissions produced around these years used a grey connector solenoid pack which had one less solenoid than the white connector version. However, the updated white connector pack (52119435AF) is the correct universal service replacement.