OBD-II code · Powertrain (generic, extended)
P273C Gear Shift Control Module A Supply Voltage Low
The shift-by-wire gear shift control module A reports a supply voltage below the operating range.
Is it safe to drive with P273C?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyWeak battery sags voltage under load
- PossibleAlternator output below regulation point
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
- 0.8–3 h
- Emissions test
- Usually unaffected
- Parts involved
- Gear Shift Module A, Charging System, Battery
Related codes
- P2DA1Gear Shift Control Module B Supply Voltage Low
- P2739Pressure Control Solenoid F Control Circuit High
- P273ATransmission Friction Element G Apply Time Range/Performance
- P273BTransmission Friction Element H Apply Time Range/Performance
- P273DGear Shift Control Module A Supply Voltage High
- P273EGear Shift Control Module A Over Temperature
- P273FTransmission Fluid Temperature Sensor B Over Temperature Condition
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.