P0740 on 2019-2022 Ram ProMaster: TCC Solenoid and Torque Converter Guide

What's Unique About the 2019-2021 Ram PROMASTER

The 2019-2021 ProMaster uses the 62TE automatic transmission, which has a well-documented history with this specific code across multiple vehicle platforms. Manufacturer Technical Service Bulletins (TSBs) for this platform provide an unusually direct diagnostic path: if the TCC solenoid tests okay, the problem is almost certainly a mechanical failure inside the torque converter itself. This guidance, combined with overwhelming anecdotal evidence from technicians and owners, takes much of the guesswork out of the diagnosis compared to other vehicles where the cause might be more ambiguous. Note: The 2022 model year switched to a 9-speed automatic transmission, so this guide and its TSB references do not apply.

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, often described as a 'shudder,' especially at highway speeds when the torque converter should be locking up. [TSB #9004206, TSB #9003453, 8]
• Engine RPM is unstable or higher than usual at steady cruising speeds.
• Reduced fuel economy.
• Transmission may feel like it's not shifting into the final gear
• Engine stalling when coming to a stop
• Transmission overheating, as the torque converter is not locking up to reduce fluid friction and heat.
• A whining noise from the transmission area.
🎬 See this walkthrough on diagnosing whining noises and replacing the converter.

Most Likely Causes

1. Failed Torque Converter 🔴 High Probability → Shop Automatic Transmission Torque Converter TSBs #9004206 and #9003453 for the 62TE transmission explicitly state that if the TCC solenoid is functional, this code indicates torque converter failure. The internal clutch material can wear out, creating excessive debris and preventing lock-up. Mechanics with extensive 62TE experience report that this is the cause in nearly 100% of cases they've repaired.
   How to confirm: After confirming the TCC solenoid and its circuit are working correctly, a failed torque converter is the diagnosis. A technician can monitor TCC slip RPM with a scan tool to confirm excessive slippage (over 60-100 RPM when commanded to lock). Excessive dark, gritty material on the transmission pan magnet is also a strong indicator.
   Typical fix: Replace the torque converter. This requires removing the transmission. It is also highly recommended to inspect the front pump and replace the transmission filter and fluid at the same time.
   Est. part cost: $250-$1000
2. Failed Torque Converter Clutch (TCC) Solenoid ⚪ Low Probability → Shop Automatic Transmission Torque Converter The solenoid is an electronic component that can fail, but on the 62TE, it is far less likely to be the root cause of P0740 than the converter itself. Many owners and shops replace this first as a cheaper, easier attempt at a fix, often without success.
   How to confirm: A technician can command the solenoid on and off with a scan tool to check for a response. The solenoid's electrical resistance can also be tested with a multimeter and compared to spec (e.g., around 4.9 ohms, though specs can vary).
   Typical fix: Replace the TCC solenoid. This is typically located inside the transmission side pan (not the bottom pan), requiring removal of the battery and tray for access on many 62TE applications. 🎬 Watch: How to replace the TCC solenoid and check fluid levels.
   Est. part cost: $60-$150
3. Low or Dirty Transmission Fluid ⚪ Low Probability → Shop Transmission Assembly
   How to confirm: Check the transmission fluid level and condition. The fluid should be at the correct level and reddish in color, not dark brown, black, or smelling burnt. Finding excessive metallic clutch material in the pan points towards converter failure.
   Typical fix: Perform a transmission fluid and filter change using the correct ATF+4 fluid. If the fluid is very dirty or contains metal particles, it indicates a more severe internal failure is the root cause.
   Est. part cost: $100-$250
4. Wiring or Connector Issue ⚪ Low Probability
   How to confirm: Visually inspect the wiring harness going to the transmission for any signs of damage, corrosion, or loose connections. A Reddit user with a 62TE transmission reported a P0740 after a transmission swap, suspecting a wiring issue as the vehicle drove normally.
   Typical fix: Repair or replace the damaged section of the wiring harness or the connector.
   Est. part cost: $20-$200

Rare But Worth Checking

• Failed Transmission Pump: → Shop Transmission Assembly TSB #9003453 mentions inspecting the pump bushing for damage when the transmission is out, suggesting pump issues can be related. Some expert mechanics recommend replacing the front pump as a preventative measure whenever replacing the torque converter for a P0740 code.
• Faulty Transmission Control Module (TCM): → Shop Transmission Assembly This is extremely rare and should only be considered after all other possibilities, including mechanical failures, have been exhaustively ruled out. On the 62TE transmission, the control logic is integrated into the Powertrain Control Module (PCM), not a separate TCM.

Diagnosis Steps

1. Check and verify the transmission fluid level and condition. Use only ATF+4 fluid. Note if the fluid is dark, burnt, or contains excessive metallic debris.
2. Use an advanced OBD-II scanner to check for any other transmission-related codes, particularly P2764 or P0700.
3. Inspect the transmission wiring harness and connectors for any visible damage, corrosion, or loose pins.
4. Using the scanner, monitor the live data for Torque Converter Clutch Slip Speed while driving at highway speeds (e.g., 55-65 mph). When lock-up is commanded, slip should be near zero. Consistent slip greater than 60-100 RPM points to a mechanical failure inside the converter.
5. Test the TCC solenoid circuit. A technician can command the solenoid on and off with the scan tool to verify its operation.
6. If the solenoid circuit has a fault, test the solenoid's resistance with a multimeter to see if it's within spec. Test at the transmission connector between Pin 3 (TCC VFS control) and Pin 10 (Battery voltage from relay).
7. If the solenoid and wiring test good, but the code and slipping/shuddering symptoms persist, follow the guidance of TSBs #9004206 and #9003453, which indicate a failed torque converter.
8. If replacing the torque converter, inspect the transmission pump bushing for scoring or damage as recommended by TSB #9003453. Consider replacing the front pump assembly as a best practice.

Parts You'll Likely Need

• Torque Converter (OEM #68039259AC (or superseded by R8039259AE for remanufactured kit)) — This is the most probable cause of P0740 on this vehicle if the TCC solenoid is functioning, as per manufacturer TSBs and extensive field reports.
  Trusted brands: Mopar, DACCO, Transtar
  OEM price range: $600-$1000
  Aftermarket price range: $250-$500
• Torque Converter Clutch (TCC) Solenoid (OEM #5169313AA) — This is the primary electrical component that controls the TCC and is the first part to test. It is a common failure point for this code, though less so than the converter on this specific platform. Often replaced unnecessarily.
  Trusted brands: Mopar, Dorman, Rostra
  OEM price range: $100-$180
  Aftermarket price range: $60-$120
• Automatic Transmission Fluid (ATF+4) (OEM #68218057AC (or equivalent)) — Fluid must be replaced when servicing the solenoid or replacing the torque converter. Only Mopar-licensed ATF+4 should be used in the 62TE.
  Trusted brands: Mopar, Valvoline, Castrol
  OEM price range: $15-$25 per quart
  Aftermarket price range: $8-$15 per quart
• Transmission Filter Kit (OEM #5078555AA) — Should always be replaced when the transmission pan is removed for service.
  Trusted brands: Mopar, Wix, ATP
  OEM price range: $40-$70
  Aftermarket price range: $20-$40

Related Codes That Often Appear With This One

• P2764 — This code for 'Torque Converter Clutch Pressure Control Solenoid Control Circuit Low' is explicitly mentioned in TSBs #9004206 and #9003453 as appearing alongside P0740 for the same underlying issues.
• P0700 — This is a generic transmission fault code that simply indicates the Transmission Control Module (TCM) has stored a fault. It will almost always be present alongside a more specific code like P0740.

Technical Service Bulletins (TSBs) & Recalls

• 9004206: Addresses jerking/slipping with P0740/P2764, pointing to torque converter failure if the TCC solenoid is good.
• 9003453: Similar to the above, also advises checking the pump bushing if the transmission is replaced and points to torque converter failure as the cause for P0740/P2764 if the solenoid is okay.

Platform-Specific Known Issues

• TSB #9004206 and #9003453 from the manufacturer are very specific for vehicles with the 62TE transmission. They state that if the vehicle is jerking or slipping with code P0740 (or P2764), the TCC solenoid operation should be checked. If the solenoid is okay, the bulletins conclude that 'the codes are indicative of a torque converter failure. Replace the torque converter.'
• Real-world experience from mechanics and owners strongly supports the TSBs. A YouTube video from 'OnlineMechanicTips' titled 'P0740 62TE Transmission – Don't Replace the TCC Solenoid!' explicitly warns against this common misdiagnosis, stating that in 100% of his repairs for this code, the fix was a new torque converter.

Mechanic-Grade Diagnostic Values

• Torque Converter Clutch (TCC) Slip RPM — expected: Near 0 RPM when lock-up is commanded by the PCM at cruising speed.. Failure: Sustained slip of more than 60-100 RPM for 10 seconds while lock-up is commanded will trigger the P0740 code.
• TCC Solenoid (Variable Force Solenoid) Control Circuit — expected: Duty cycle percentage commanded by the PCM, visible on a scan tool.. Failure: The PCM commanding maximum duty cycle (greater than 85% or 100%) without the TCC slip RPM dropping into the target range indicates a mechanical/hydraulic failure, not an electrical one.
• TCC Solenoid Resistance — expected: Approximately 1.6-1.8 ohms, though this can vary with temperature. Note: This value is for the shift solenoids in the main pack; the TCC solenoid is separate but may have similar resistance. Always verify with a known good part or service manual if possible.. Failure: A reading that is significantly higher (e.g., 7.2 ohms as seen in one test video) or open/shorted indicates a failed solenoid.

Scan Tool Commands That Help

• wiTECH or equivalent advanced scanner: TCC Solenoid On/Off Command — This bidirectional control is used to verify the electrical integrity of the TCC solenoid and its circuit. A technician can command the solenoid on and listen for a click or observe a change in state, confirming the wiring and solenoid coil are functional.
• wiTECH: Quick Learn Procedure — This procedure is required after replacing the transmission, valve body, or clearing adaptation memory cells. It allows the TCM to relearn clutch fill times and pressures for optimal shift quality. While not a direct fix for P0740's root cause, it is a necessary final step after a major repair like a torque converter replacement.

Wiring & Ground Locations

• Transmission Main Connector (C1) — The main electrical connector on the 62TE transmission case, often accessed from the driver's side wheel well or from under the vehicle.. This connector is the primary point for testing the TCC circuit externally. Pin 3 is the TCC VFS (Variable Force Solenoid) control wire from the PCM. Pin 10 is the power feed from the transmission control relay. Testing for voltage, ground, and resistance at these pins can isolate a wiring fault from an internal transmission issue.

Real Owner Repair Stories

• YouTube channel 'white trash racing' (2011 Dodge Grand Caravan with 62TE transmission, 131,000 miles at failure.) — P0740 code, torque converter not locking up.
  ❌ Tried (didn't work) The owner proceeded directly to the most likely cause based on scan tool data.
  ✅ What actually fixed it The owner replaced the torque converter and, as a preventative measure while the transmission was out, also replaced the TCC lock-up solenoid. Post-repair scan tool data showed TCC slip at zero RPM during cruise, confirming the fix was successful.

Model Year Variations Within This Range

• 2019-2021: These model years use the 62TE automatic transmission. It was a revised version compared to earlier ProMasters, featuring a larger parking pawl and other internal updates. All diagnostics and parts mentioned in this guide apply to this version.
• 2022: For the 2022 model year, Ram replaced the 6-speed 62TE with a ZF-sourced 9-speed automatic (948TE). This is a completely different transmission with its own control module, solenoids, and diagnostic procedures. Therefore, the TSBs, part numbers, and diagnostic steps in this guide DO NOT apply to 2022 and newer ProMasters.