Code Definition

P0801 — Reverse Inhibit Control Circuit Malfunction

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

About P0801

P0801 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 P0801 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 P0801 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 P0801 is set when the transmission control module (TCM) or the engine control module (ECM) in vehicles with integrated control systems detects a malfunction in the reverse inhibit control circuit. This circuit is responsible for preventing the vehicle from shifting into reverse under certain conditions, typically when it's unsafe or mechanically detrimental, like shifting into reverse at high speeds or when moving forward. A malfunction in this circuit can lead to the inability to engage reverse gear when needed or, conversely, allow engagement of reverse gear in situations wher...

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