Code Definition

P0803 — 1-4 Upshift (Skip Shift) Solenoid Control Circuit Malfunction

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

About P0803

P0803 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 P0803 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 P0803 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 P0803 is set when the transmission control module (TCM) or the engine control module (ECM) detects a malfunction within the control circuit of the 1-4 upshift (skip shift) solenoid. This solenoid is used in certain vehicle transmissions to facilitate a direct upshift from 1st gear to 4th gear under specific driving conditions, often as a means to improve fuel efficiency or reduce emissions. The malfunction in the control circuit can be due to electrical issues such as wiring problems, connector damage, or faults within the solenoid itself. This can result in the inability to eng...

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