P0888 Code - Transmission Relay Always Off

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

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  1. fault code

    fault code Administrator Staff Member

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    What does P0888 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 P0888 ?

    A transmission control power relay sense circuit problem can be caused by a number of malfunctions:
    • A faulty TCR (transmission control relay)
    • An open TCR output circuit
    • A short in the TCR control or output circuit
    • A faulty PCM (powertrain control module)
    • A faulty connection within the circuit
    • A faulty transmission solenoid/pressure switch assembly


    How do you troubleshoot P0888 ?

    With the valve disconnected, the red voltmeter lead should be attached to the IMRC valve power wire and the black voltmeter lead connected to ground. It should be pretty close to battery voltage (12 volts). If not, then this is the circuit that has the problem.

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