Code Definition

P0887 — TCM Power Relay Control Circuit High

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Generic

About P0887

P0887 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P0887 is stored, the module has detected a signal or supply voltage higher than the expected operating range.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0887 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The fault code P0887 is set when the control module detects a high signal in the Transmission Control Module (TCM) power relay control circuit. This high signal condition indicates that the voltage in the relay control circuit is exceeding the normal operational range. A high signal can potentially lead to over-engagement or damage to the relay, affecting its ability to properly control the power supply to the TCM. This situation can disrupt the normal operation of the transmission system.

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