2016-2020 Grand Caravan & Town & Country Engine Module (ECM/PCM): Stalling, No-Start, and Programming Guide

Is it an ECM, ECU, or PCM?

You will see the terms Engine Control Module (ECM), Engine Control Unit (ECU), and Powertrain Control Module (PCM) used interchangeably. For the 2016 Chrysler Town & Country and 2016-2020 Dodge Grand Caravan, PCM is the most accurate term. That's because this single module controls both the 3.6L V6 engine and the 62TE 6-speed automatic transmission.

Symptoms of a Failing PCM

A failing PCM can cause a variety of symptoms, which can be intermittent and sometimes confusing. Because the PCM controls so many functions, its failure can mimic other problems.

• Engine Stalling or Misfiring: The engine may stall unexpectedly while driving, sometimes after hitting a bump, or it may run rough and misfire. This is a major safety concern.
• No-Start or Intermittent Start: You turn the key, the engine cranks over, but it refuses to start. This may happen every time or only occasionally.
• Check Engine Light: A constant or flashing Check Engine Light is a primary indicator. Specific codes, especially P0601, strongly point to an internal PCM failure.
• Poor Performance and Fuel Economy: You might notice a sudden, significant drop in gas mileage or a serious lack of acceleration.
• Erratic Transmission Shifting: The transmission may shift harshly, delay shifts, or get stuck in one gear (known as "limp mode").
• Other Warning Lights: Sometimes a failing PCM can cause other warning lights on the dashboard to illuminate incorrectly.

Common Diagnostic Trouble Codes (DTCs)

If the Check Engine Light is on, reading the stored codes with an OBD-II scanner is the first step. Certain codes are a clear sign of PCM failure.

• P0601 - Internal Control Module Memory Check Sum Error: This is the most definitive code for a fatal PCM failure. It means the module's internal self-check has failed, and it cannot be repaired by reflashing. If you have this code, the PCM needs to be replaced.
🎬 See why the P0601 code means your PCM has failed
• P0600 - Serial Communication Link: This code indicates a loss of communication between the PCM and other modules on the vehicle.
• P0602 through P0605: These codes also point to various internal programming and memory errors within the control module.
• U0100 - Lost Communication With ECM/PCM: This means other modules on the vehicle can no longer communicate with the PCM, which can be caused by a failed PCM or a wiring issue.

Is It the PCM or the TIPM?

Many Chrysler, Dodge, and Jeep vehicles of this era are known for problems with the Totally Integrated Power Module (TIPM). The TIPM is the vehicle's main fuse and relay box, but it's also a computer that controls nearly all of the vehicle's electrical accessories. Symptoms of a bad TIPM, such as engine stalling, a no-start condition, or fuel pump issues, can be identical to PCM failure symptoms. It is critical to have a technician perform a proper diagnosis to determine if the fault is in the PCM or the TIPM to avoid replacing the wrong expensive part.

Known Issues, TSBs, and Recalls

While there are no widespread recalls specifically for PCM failure across all model years, there are related issues to be aware of:

• Voltage Regulator Failure (2017-2018 models): Some 2017-2018 Grand Caravans were noted to have failures of the voltage regulator chip inside the PCM, leading to stalling or no-start conditions. This indicates a known internal failure point for the module.
• Transmission Pump Seizure (Recall S44): Certain 2015-2016 Town & Country and Grand Caravan models were recalled because the transmission pump could seize, causing a loss of motive power. While not a PCM issue, the symptoms could be confused with PCM-related transmission problems.
• Other Recalls: These vehicles have had other recalls for issues like hood latches, third-row seat torque, and windshield bonding, but these are unrelated to the PCM.

Buying a Used Engine Control Module (PCM)

Given the high cost of a new PCM, a quality used OEM unit is an excellent value. However, you must follow these steps carefully.

1. Match the Part Number: The most important step is to match the OEM part number. The primary part number for these vehicles is 68243295AB, which supersedes the older 68243295AA. The letters at the end are important, but the AB version is the updated replacement for AA.
2. Understand Programming is Required: You cannot simply install a used PCM from another van. It must be programmed with your van's VIN.
3. Choose Your Programming Method: You have a few options:
   • Buy Pre-Programmed: Many online sellers of used and remanufactured PCMs offer to pre-program the unit with your VIN before shipping it to you. This is often the easiest path for a DIY installation.
   • Buy and Have it Programmed Locally: You can buy a used PCM from a salvage yard and take the vehicle and the module to a dealership or a qualified independent shop to have it programmed. Some automotive locksmiths also have this capability.
   • Mail-In Programming Service: You can purchase a used PCM and mail it to a specialized service that will flash your VIN onto it for a fee, then mail it back to you.

PCM Replacement Cost

The cost can vary significantly based on the part source and labor for programming.

PCM Location and Replacement Overview

The PCM is located in the engine bay, mounted to the body on the driver's side, near the front wheel well and behind the headlight assembly.

1. Disconnect the battery. This is a critical first step for any electronic work.
2. Access the module. You may need to remove the plastic wheel well liner for easier access.
3. Disconnect the electrical connectors. There are several large multi-pin connectors. Be careful with the locking tabs.
4. Unbolt the module. The PCM is typically held in place by a few bolts.
5. Install the new module and reconnect everything in reverse order.

Remember, after the physical installation, the vehicle will not start until the programming and key relearn procedure is completed by a professional.

Frequently Asked Questions