OBD-II code · Powertrain (generic, extended)
P2DA1 Gear Shift Control Module B Supply Voltage Low
Supply voltage on the gear shift control module B is below the expected window.
Is it safe to drive with P2DA1?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyModule supply fuse blown
- PossibleWiring fault
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
- 1–5 h
- Emissions test
- Usually unaffected
- Parts involved
- Gear Shift Control Module B, Wiring Harness
Related codes
- P273CGear Shift Control Module A Supply Voltage Low
- P2D9EHigh Voltage System Voltage Low
- P2D9FHigh Voltage System Voltage High
- P2DA0High Voltage System Voltage Performance
- P2DA2Gear Shift Control Module B Supply Voltage High
- P2DA3Gear Shift Control Module B Overtemperature
- P2DA4Coolant Heater A Internal Control Module Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.