Code Definition

P0815 — Upshift Switch Circuit

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

About P0815

P0815 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 P0815 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 P0815 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 P0815 is set when the vehicle's powertrain control module (PCM) or transmission control module (TCM) detects an issue with the upshift switch circuit. This circuit is part of the transmission control system in vehicles equipped with manual transmissions or semi-automatic transmissions, where the driver can manually select gears. The upshift switch is used to signal the control modules when the driver intends to shift to a higher gear. A malfunction in this circuit can affect the vehicle's ability to correctly register or respond to upshift requests.

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