OBD-II code · Powertrain (generic, extended)
P273D Gear Shift Control Module A Supply Voltage High
The gear shift control module A reports a supply voltage above the operating range.
Is it safe to drive with P273D?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyAlternator regulator failed to limit output
- Less likelyLoad dump transient after disconnecting a heavy load
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–3.5 h
- Emissions test
- Usually unaffected
- Parts involved
- Gear Shift Module A, Charging System
Related codes
- P2DA2Gear Shift Control Module B Supply Voltage High
- P273ATransmission Friction Element G Apply Time Range/Performance
- P273BTransmission Friction Element H Apply Time Range/Performance
- P273CGear Shift Control Module A Supply Voltage Low
- P273EGear Shift Control Module A Over Temperature
- P273FTransmission Fluid Temperature Sensor B Over Temperature Condition
- P2740Transmission Fluid Temperature Sensor B Circuit
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.