What does code P077D mean?

Q: What does code P077D mean?

Output Shaft Speed Sensor Circuit High. P077D means the transmission control module (TCM) has detected an abnormally high voltage on the output shaft speed sensor circuit, which typically indicates an open circuit, a short to power, or a sensor that is not returning the expected signal. The TCM compares this signal against other speed inputs and sets the code when the voltage stays above the calibrated threshold for a set time.

DTC codes / P07xx · Transmission / P077D

P077DOutput Shaft Speed Sensor Circuit High

P077D means the transmission control module (TCM) has detected an abnormally high voltage on the output shaft speed sensor circuit, which typically indicates an open circuit, a short to power, or a sensor that is not returning the expected signal. The TCM compares this signal against other speed inputs and sets the code when the voltage stays above the calibrated threshold for a set time.

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.