Code Definition

P1904 — Pressure Control Solenoid C Open Circuit

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

About P1904

P1904 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 P1904 is stored, the module has detected an open (broken or disconnected) electrical path 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.

P1904 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 P1904 fault code indicates that the Transmission Control Module (TCM) has detected an open circuit in the circuit controlling Pressure Control Solenoid C. This solenoid regulates hydraulic pressure for proper transmission operation. The fault is set when the TCM detects no electrical continuity or an abnormally high resistance in the solenoid circuit.

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