Code Definition

P0885 — TCM Power Relay Control Circuit Open

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

About P0885

P0885 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 P0885 is stored, the module has detected an open (broken or disconnected) electrical path in the monitored circuit.

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 P0885 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 P0885 is set when the control module detects an open condition in the Transmission Control Module (TCM) power relay control circuit. An open circuit condition means there is a lack of continuity in the circuit, preventing the power relay from functioning correctly. This relay is crucial for supplying power to the TCM, and an open circuit can result in a complete lack of power to the module, leading to the inability to control the transmission system.

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