Code Definition

P0804 — Skip Shift Lamp Control Circuit Malfunction

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

About P0804

P0804 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 P0804 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 P0804 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

This fault code P0804 is set when the vehicle's powertrain control module (PCM) detects a malfunction within the skip shift lamp control circuit. This typically occurs when the PCM does not receive the expected voltage signal from the skip shift lamp circuit, indicating an issue with the circuit's integrity or operation. The skip shift system is designed to improve fuel efficiency by suggesting optimal shift points, and the lamp is an indicator for the driver.

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