Code Definition

P1908 — Transmission Pressure Circuit Solenoid Open or Short to Ground

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

About P1908

P1908 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 P1908 is stored, the module has detected an open (broken or disconnected) electrical path in the monitored circuit; and 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.

P1908 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 P1908 fault code indicates that the Transmission Control Module (TCM) has detected an open circuit or a short to ground in the Transmission Pressure Control Solenoid circuit. This solenoid regulates hydraulic pressure to ensure smooth gear shifts and proper transmission operation. When the circuit is open or grounded incorrectly, the solenoid cannot function properly, leading to potential shifting issues or pressure control failures.

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