DTC codes / P08xx · Transmission / P0887
P0887 indicates that the Transmission Control Module (TCM) has detected an abnormally high voltage on the power relay control circuit, which supplies power to the transmission control system. The TCM expects a specific voltage range on this circuit and sets the code when the signal exceeds the upper threshold, often due to a short to voltage or a faulty relay.
Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.
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