Code Definition

P1903 — Pressure Control Solenoid C Short Circuit

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Generic

About P1903

P1903 is a manufacturer-specific powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P1903 is stored, the module has detected a short-circuit (voltage pulled to ground or to supply) in the monitored circuit.

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.

P1903 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

The P1903 fault code indicates that the Transmission Control Module (TCM) has detected a short circuit in the circuit controlling Pressure Control Solenoid C. This solenoid is responsible for regulating hydraulic pressure within the transmission for proper gear shifting and performance. The fault is triggered when the TCM identifies a direct short to power or ground, causing excessive current flow or loss of control over the solenoid.

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