What does code P1738 mean?

Q: What does code P1738 mean?

Shift Time Error. P1738 on Mazda vehicles indicates that the transmission control module (TCM) has detected a shift time error, meaning the actual time taken to complete a gear change does not match the expected value stored in its memory. The TCM monitors the difference between commanded and actual shift timing, and when this deviation exceeds a calibrated threshold, it logs this code and typically illuminates the warning light.

DTC codes / Mazda codes / P1738

P1738 · MazdaShift Time Error

P1738 on Mazda vehicles indicates that the transmission control module (TCM) has detected a shift time error, meaning the actual time taken to complete a gear change does not match the expected value stored in its memory. The TCM monitors the difference between commanded and actual shift timing, and when this deviation exceeds a calibrated threshold, it logs this code and typically illuminates the warning light.

SystemPowertrain

Code typeMazda specific

SeverityMedium

Fix difficultyProfessional

AreaTransmission

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