P0613: TCM Processor (Meaning, Causes, Fixes)

What P0613 means

The transmission control module (TCM) runs the automatic transmission. OBD-Codes.com explains that on some vehicles the TCM is a separate module, but most often it is integrated into the powertrain control module (PCM). Each time the ignition is turned on, the controllers run self-tests and use the controller area network (CAN) to compare signals between modules. If the PCM finds a problem with TCM function, it stores P0613 and may turn on the check engine light, sometimes only after several failed cycles. RepairPal describes the code as the PCM detecting an incorrect signal related to the TCM. The code is generic to OBD-II vehicles (1996 and newer); OBD-Codes.com names Chrysler, Dodge, Jeep, Audi and Land Rover among the makes that use it, and search interest also shows people looking it up for Ram, VW, Toyota and Mercedes, so check technical service bulletins (TSBs) for your vehicle.

Severity: can I keep driving?

Stop and fix promptly

Get it checked right away. RepairPal rates P0613 'Urgent', meaning immediate action is needed because it can cause severe damage or put people at risk. OBD-Codes.com says internal control module codes must always be taken seriously and that P0613 can cause delayed shifts, erratic shifting or a failure to shift. If the transmission isn't shifting properly, avoid highway driving until it's diagnosed.

Common symptoms

• Transmission doesn't shift properly (both sources)
• Erratic, delayed or harsh shifting, or failure to shift (OBD-Codes.com)
• Speedometer or odometer that doesn't work or reads wrong (OBD-Codes.com)
• Check engine light, often with other stored TCM or PCM codes (OBD-Codes.com)

Likely causes

Roughly most to least common, based on the sources below. Your vehicle may differ.

1. A failed TCM or PCM (both sources)
2. A TCM or PCM programming error (OBD-Codes.com)
3. Open or shorted wiring or connectors in the CAN harness, or other wiring problems (both sources)
4. A failed power supply to the TCM or PCM (OBD-Codes.com)
5. A poor control module ground (OBD-Codes.com)

Diagnostic steps you can do

1. Read all stored codes and freeze frame data and write them down. OBD-Codes.com says any TCM/PCM power supply codes need to be repaired before you diagnose P0613.
2. Check the fuses and relays that feed the TCM and PCM. OBD-Codes.com says to test fuses with the circuit loaded.
3. Inspect the controller wiring and harnesses, and check the chassis and engine ground connections for corrosion or looseness.
4. Look the modules over for signs of water, heat or collision damage. OBD-Codes.com says a controller damaged by water should be considered defective.
5. Clear the code and test drive. If it doesn't come back, it may be intermittent, which OBD-Codes.com says makes it harder to diagnose; the fault may need to get worse before it can be pinned down.
6. Look up TSBs for your year, make, model and engine that mention P0613.

Typical fixes

• Repair a blown fuse, failed relay or bad power supply to the module
• Clean and repair poor module grounds
• Repair damaged CAN or module wiring and connectors
• Reprogram the TCM/PCM if a programming error is found
• Replace and program the TCM or PCM if it has failed

Repair costs vary widely by vehicle, region, parts brand and shop, so we don't quote prices. Get a written estimate after diagnosis.

Related codes

• P0614 ECM/TCM Incompatible
• P0611 Fuel Injector Control Module Performance
• P0615 Starter Relay Circuit
• P0610 Control Module Vehicle Options Error
• P0616 Starter Relay Circuit Low

Also listed in this guide:

All Computer & output circuit codes (P06xx) →

FAQs

Sources

1. OBD-Codes.com: P0613 TCM Processor
2. RepairPal: P0613 TCM Processor (rated Urgent)