P2764 on 2014-2018 Ram ProMaster: Torque Converter Solenoid Circuit Causes and Fixes

What's Unique About the 2014-2018 Ram PROMASTER

The Ram ProMaster in this year range uses the ubiquitous 62TE automatic transmission, which is also found in millions of Dodge, Chrysler, and VW minivans. A manufacturer 🎬 Watch: A breakdown of common 62TE transmission problems and failures. Technical Service Bulletin (TSB #9004206, also referenced as 9004009) provides a critical diagnostic clue for this entire family of vehicles. It explicitly states that if the TCC solenoid's operation is confirmed to be okay, code P2764 is indicative of a torque converter failure. This is a widely acknowledged issue, and owners should be aware that a simple solenoid swap may not fix the problem; the root cause is often the more substantial torque converter itself, which requires removing the transmission to replace.

Diagnostic Flowchart

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

Symptoms You May Notice

• Check Engine Light is on
• Vehicle jerking or slipping, especially during shifts.
• Shuddering or vibration during acceleration.
• Harsh or delayed gear shifts.
• Engine RPMs are higher than usual at cruising speeds, as if the clutch isn't locking up.
• Decreased fuel economy.
• Stalling when coming to a stop, as the torque converter fails to disengage.

Most Likely Causes

1. Failing Torque Converter 🔴 High Probability A specific TSB (#9004206 / 9004009) for the 62TE transmission explicitly states that if the TCC solenoid is functioning, this code indicates torque converter failure. This is a very common failure point for this transmission across multiple vehicle platforms.
   How to confirm: After verifying the TCC solenoid and its wiring are good, the torque converter becomes the primary suspect. This is typically confirmed by a professional technician who may note a lack of lock-up at cruising speed or other symptoms. The repair requires removing the transmission.
   Typical fix: Replace the torque converter. This is a major repair that requires removing the transmission from the vehicle. 🎬 Watch: A step-by-step guide to removing the transmission and torque converter.
   Est. part cost: $220-$500
2. Faulty Torque Converter Clutch (TCC) Solenoid 🟡 Medium Probability Solenoids are electro-mechanical parts submerged in hot fluid; they can fail electrically or become clogged with debris over time. The TCC solenoid is part of the main solenoid pack on the 62TE.
   How to confirm: A technician can command the solenoid on and off with a diagnostic scan tool. The solenoid's resistance can also be tested with a multimeter. A professional scan tool can also monitor solenoid voltage to confirm the 'low circuit' reading.
   Typical fix: Replace the TCC solenoid, which is part of the solenoid pack/block located inside the transmission oil pan. 🎬 See this walkthrough on replacing the solenoid pack in a ProMaster. This is accessible after removing the pan.
   Est. part cost: $150-$350
3. Wiring or Connector Issues ⚪ Low Probability Wiring to the transmission can be exposed to heat and road debris, potentially causing shorts, corrosion, or breaks in the circuit leading to the solenoid pack connector. Poor grounds are a known source of various electrical issues on ProMaster vans.
   How to confirm: Visually inspect the wiring harness leading to the transmission for any signs of damage. Check for continuity and voltage drops at the connector for the TCC solenoid. Pay special attention to the main ground strap on top of the transmission.
   Typical fix: Repair or replace the damaged section of the wiring harness or the connector.
   Est. part cost: $20-$100
4. Low or Contaminated Transmission Fluid ⚪ Low Probability While less likely to cause a specific 'circuit low' code, extremely low or dirty fluid can cause erratic solenoid operation and lead to numerous transmission codes. Burnt fluid or fluid with metal shavings is a strong indicator of internal failure, possibly from the torque converter.
   How to confirm: Check the transmission fluid level and condition. The fluid should be at the correct level, red in color (for ATF+4), and not smell burnt. Dark or metallic fluid points to a serious internal problem.
   Typical fix: Perform a transmission fluid and filter change. If the fluid is very dark or contains metal shavings, it indicates a more severe internal problem is likely, such as the torque converter.
   Est. part cost: $100-$250

Rare But Worth Checking

• Faulty Transmission Control Module (TCM): This is rare. The TCM is the computer that controls the transmission. A fault in the TCM's driver circuit for the solenoid can cause a P2764 code. It should only be considered as a cause after all other possibilities, including wiring, solenoids, and the torque converter, have been ruled out.

Diagnosis Steps

1. Check and document any other stored trouble codes with an OBD-II scanner.
2. Check the transmission fluid level and condition. The correct fluid is Mopar ATF+4. Note any burnt smell or discoloration.
3. Visually inspect the transmission wiring harness and the main connector for any signs of damage, corrosion, or loose connections.
4. Using a professional scan tool, monitor the TCC solenoid commanded status and voltage readings to confirm the 'low circuit' condition.
5. Test the TCC solenoid circuit for proper voltage and ground at the transmission connector. Check the solenoid's internal resistance with a multimeter (if specifications are available).
6. If the solenoid and wiring test good, follow the guidance from TSB #9004206/9004009 and investigate the torque converter for failure. This step is best left to a professional as it requires transmission removal.
7. If all other components check out, the Transmission Control Module (TCM) may be at fault, but this is highly unlikely.

Parts You'll Likely Need

• Torque Converter (OEM #RL070538AB) — A manufacturer TSB points to this as the likely cause if the solenoid and wiring are okay. This is a very common failure on the 62TE transmission.
  Trusted brands: Mopar, LuK, Valeo, Transtar
  OEM price range: $220-$310
  Aftermarket price range: $150-$300
• Transmission Solenoid Pack (contains TCC solenoid) (OEM #68376696AA (supercedes 5078709AB)) — This is the most common electrical component to fail for this code, though less common than the converter on this platform.
  Trusted brands: Mopar, Rostra, Dorman
  OEM price range: $250-$400
  Aftermarket price range: $150-$250
• ATF+4 Transmission Fluid (OEM #68218057AC (Quart), 68218058AC (5L)) — Required for any repair involving opening the transmission, such as replacing the solenoid or torque converter. The 62TE requires this specific fluid type.
  Trusted brands: Mopar, Valvoline, Castrol, Pennzoil
  OEM price range: $10-$15 per quart
  Aftermarket price range: $8-$12 per quart

Related Codes That Often Appear With This One

• P0740 — P0740 is 'Torque Converter Clutch Circuit Malfunction'. It is a more general TCC circuit code and is often triggered alongside P2764, as noted in TSB #9004206/9004009.
• P0700 — This code means 'Transmission Control System Malfunction'. It is a generic code set by the Engine Control Module (ECM) when the Transmission Control Module (TCM) stores a specific fault code, like P2764.

Technical Service Bulletins (TSBs) & Recalls

• Mopar TSB #9004206 / #9004009: Addresses jerking/slipping with codes P0740 or P2764, pointing to torque converter failure if the solenoid is okay.

Platform-Specific Known Issues

• TSB #9004206 (also cited as Mopar document #9004009) for the 62TE transmission states: '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.'
• A video from the YouTube channel 'ProMasters Only' specifically discusses the 62TE torque converter as a failure point, noting that replacement is a 6+ hour job.
• Another TSB (ATRA #1648) from 2014 describes a P2764 scenario where the vehicle stalls when put in Drive but not in Reverse, caused by the TCC being stuck on. The bulletin recommends replacing the TCC solenoid. This highlights the importance of proper diagnosis to differentiate between a stuck solenoid and a failed converter.

Mechanic-Grade Diagnostic Values

• TCC (EMCC) VFS Solenoid Resistance — expected: The TCC solenoid is not in the main solenoid pack on a 62TE; it bolts directly to the valve body. Resistance specifications are not readily available, but testing the circuit is key.. Failure: An open or shorted circuit reading when testing the pins leading to the solenoid.
• Shift Solenoid Resistance (for comparison) — expected: 1.6 - 1.8 Ohms at ~70°F. Note: Resistance changes with temperature.. Failure: A reading that is significantly different from the other similar solenoids in the pack (e.g., open circuit, or a much higher reading like 7.2 Ohms).
• Line Pressure Solenoid Resistance — expected: 4.8 - 5.1 Ohms.. Failure: A reading significantly outside this range.

Scan Tool Commands That Help

• wiTECH (Dealer Tool), Autel/Snap-on (Professional): TCC Solenoid Activation / Duty Cycle Command — This bidirectional control is used to command the TCC solenoid on and off while monitoring circuit voltage. This directly tests the solenoid's electrical functionality and the integrity of the control circuit from the TCM. If the solenoid clicks and voltage responds as commanded, the electrical circuit is likely good, pointing towards a mechanical or hydraulic issue (like the torque converter itself).
• wiTECH: Reprogram PCM/TCM — Chrysler has issued software updates for the transmission control logic. If shift quality issues or intermittent, difficult-to-diagnose codes are present, checking for and applying the latest TCM software is a valid diagnostic step before replacing major components.

Wiring & Ground Locations

• 62TE Main Connector (23-way) — On the front side of the transmission case, where the main vehicle harness connects.. This is the primary point for testing the entire transmission electrical system from outside the case. The TCC solenoid control circuit can be tested here. Pin 3 is for the TCC VFS (EMCC) control. Pin 10 provides battery voltage power from the transmission control relay.
• Main Engine/Transmission Ground Strap — A braided strap/cable located on the top of the transmission, often attached to one of the starter bolts and connecting to the chassis frame.. This is a known weak point on ProMasters. A poor ground here can cause a wide range of bizarre electrical issues, including intermittent stalling and incorrect voltage readings for transmission components, potentially triggering a 'circuit low' code like P2764.

Real Owner Repair Stories

• Reddit user in r/promaster (2015 Ram ProMaster 1500) — Intermittent stalling while driving, usually after accelerating and then letting off the gas. Battery light and sometimes oil light would flash. The van would restart after being put in park.
  ❌ Tried (didn't work) Two independent mechanics and a dealership could not diagnose the issue. The dealership suspected an oil leak into the alternator and quoted $18,000 in potential repairs.
  ✅ What actually fixed it The user did not post a final confirmed fix, but the top-rated community suggestion was to check the main ground strap on top of the transmission, which is a known cause for a 'slew of weird issues' on these vans.

OEM Part Supersession History

• 5078709AB → 68376696AA — Updated design for improved reliability and durability.
  Heads up: The parts are interchangeable. 68376696AA is the correct service replacement for 5078709AB.