Code Definition

P0813 — Reverse Output Circuit

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

About P0813

P0813 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 P0813 is stored, the module has detected an electrical-circuit fault in the wiring, connector, or driver associated with the named component.

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 P0813 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

Fault code P0813 is set when the vehicle's powertrain control module (PCM) or transmission control module (TCM) detects a malfunction within the reverse output circuit. This circuit is involved in controlling or signalling the operation of the reverse gear in a vehicle. The issue typically pertains to the electrical aspects of the circuit responsible for activating or managing the reverse gear functionality. Problems in this circuit can affect the vehicle's ability to engage reverse gear or to correctly indicate its engagement.

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