What does code P0904 mean?

Q: What does code P0904 mean?

Gate Select Position Circuit. P0904 indicates that the transmission control module (TCM) has detected an implausible or missing signal from the gate select position circuit, which reports the physical position of the automatic transmission's shift gate. The TCM compares this signal with other range and speed inputs and sets the code when the gate position does not match expected values or the circuit voltage falls outside its valid range.

DTC codes / P09xx · Transmission / P0904

P0904Gate Select Position Circuit

P0904 indicates that the transmission control module (TCM) has detected an implausible or missing signal from the gate select position circuit, which reports the physical position of the automatic transmission's shift gate. The TCM compares this signal with other range and speed inputs and sets the code when the gate position does not match expected values or the circuit voltage falls outside its valid range.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaTransmission

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.