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Our automotive experts have put together the following information about the P0C66 diagnostic trouble code. We've provided the common symptoms that occur when this code is set along with the frequent repairs that address the issues related to the P0C66 code.

OBD II Fault Code

  • OBD II P0C66

    OBD-II Code Internal transmission failure is defined as a Generator Position Sensor Circuit "A" Low

    Code P0C66 is stored anytime there is a fault detected within the engine, generator, or powertrain systems.

    Common Problems That Trigger the P0C66 Code

    • Internal engine failure
    • Internal transmission failure
    • Transmission Control Module (TCM) software needs to be updated
    • Wiring issue
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