P0613 OBD-II Trouble Code: TCM Processor

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Cost of diagnosing the P0613 code

P0613 is a diagnostic trouble code (DTC) for "TCM Processor". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

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P0612 code definition

The P0612 code indicates that there has been a fault detected within the circuitry or processor for the transmission control module, or TCM.

What the P0612 code means

If an OBD-II scanner has detected that the P0612 code is stored in the PCM, it means that the transmission control module system is not working correctly.

What causes the P0612 code?

In most cases, the likely cause for the PCM to store the P0612 code is due to a defective TCM. However, there may be another cause, including:

What are the symptoms of the P0612 code?

A fault within the TCM will usually be observed in a variety of issues with the regular operation of the vehicle. It may become difficult to shift, there may be a marked decrease in fuel economy, the engine may stall frequently or idle roughly, and/or it may become difficult to accelerate. The Check Engine Light will be illuminated in most cases, particularly after several drive cycles. Finally, the PCM will store the P0612 code, which may be in a pending status if the vehicle hasn’t been through several drive cycles yet.

How does a mechanic diagnose the P0612 code?

The first step that a technician should take is to use an OBD-II scanner to detect and verify the code. Once the P0612 code has been verified, they should inspect all the electrical wiring and connectors that connect the TCM to the PCM, and that are a part of the greater CAN. After repairing any loose, corroded, or shorted electrical components, the code should be cleared, and the system should be retested. If the P0612 is stored again, the mechanic has diagnosed an issue with the TCM.

Common mistakes when diagnosing the P0612 code

The most common mistake made when diagnosing a code like the P0612 is to repair the electrical components, or the faulty TCM itself, without checking for further issues. Usually the fault in the TCM will not be registered until another issue requires the TCM to register some communication to the PCM. This means that there is another repair possibly needed, and by only addressing the immediate cause of the P0612 code, there could be a necessary repair going ignored.

How serious is the P0612 code?

The P0612 code is a serious issue that should be addressed immediately. The TCM is responsible for regulating the electrical signals within the automatic transmission of a car. This means it is part of the gear shifting capabilities as well as other key processes that are required for the vehicle to function properly. If this issue is left unaddressed, the results could be as serious as total transmission failure.

What repairs can fix the P0612 code?

Repairing the immediate cause of the P0612 code may include any or all of the following processes:

  • After diagnosing and repairing any obviously faulty electrical components, the technician should clear the code and retest the system.
  • Using a specialized CAN scanner, a technician may be able to find the specific area where there are circuitry issues, and repair these.
  • The technician should always clear the code and perform a road test to ensure that these repairs have solved the issue, after each set of repairs.
  • Repair or replace the TCM if necessary.
  • Test the module ground circuits for continuity, and repair or replace any faulty components.

After the P0612 code has been resolved, the technician should turn their attention to diagnosing and repairing the issue that originally caused the faulty TCM to be detected.

Need help with a P0612 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6220.

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