What does code P273D mean?

Q: What does code P273D mean?

Gear Shift Control Module A Supply Voltage High. P273D indicates that the transmission control module (TCM) has detected an abnormally high supply voltage on the power feed to the gear shift control module A. The TCM monitors this circuit and sets the code when the voltage exceeds the expected range, typically due to a wiring fault, a failing module, or a charging system issue.

DTC codes / P27xx · Transmission / P273D

P273DGear Shift Control Module A Supply Voltage High

P273D indicates that the transmission control module (TCM) has detected an abnormally high supply voltage on the power feed to the gear shift control module A. The TCM monitors this circuit and sets the code when the voltage exceeds the expected range, typically due to a wiring fault, a failing module, or a charging system issue.

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.