What does code P0729 mean?

Q: What does code P0729 mean?

Gear 6 Incorrect Ratio. P0729 is a generic transmission code indicating that the powertrain control module (PCM) has detected an incorrect gear ratio for sixth gear. The PCM calculates the expected ratio by comparing transmission input shaft speed to output shaft speed and flags the code when the measured ratio deviates from the stored value beyond a calibrated threshold.

DTC codes / P07xx · Transmission / P0729

P0729Gear 6 Incorrect Ratio

P0729 is a generic transmission code indicating that the powertrain control module (PCM) has detected an incorrect gear ratio for sixth gear. The PCM calculates the expected ratio by comparing transmission input shaft speed to output shaft speed and flags the code when the measured ratio deviates from the stored value beyond a calibrated threshold.

SystemPowertrain

Code typeGeneric (all makes)

SeverityHigh

Fix difficultyProfessional

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.