P0864 Code - TCM Communication Circuit Range/Performance

Discussion in 'P - Powetrain Codes' started by fault code, Mar 28, 2018.

  1. fault code

    fault code Administrator Staff Member

    May 11, 2017
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    What does P0864 Mean?

    The PCM has detected a malfunction in the traction control module communication circuit. The traction control module communication circuit delivers data to the PCM and other controllers where it is utilized to calculate engine RPM, fuel delivery strategy, and engine timing, among other things. This code applies to vehicles equipped with electronic traction control systems only.

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    What are the common causes of P0864 ?
    • An air leak forward of the DPF will change the sensor readings resulting in the code
    • Rusty exhaust systems, cracked exhaust manifolds or damaged or missing gaskets or donuts will cause air leaks.
    • Faulty IMRC actuator/sensor

    How do you troubleshoot P0864 ?

    Several repairs can fix a P0864 trouble code and include:
    • Replace or repair damaged wiring and connectors
    • Replace damaged or defective traction control switch
    • Replace damaged or defective traction control module
    • Clear all codes, test-drive the vehicle, and rescan to see if any codes reappear

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