Powertrain
Definition only
Lights the check engine lamp
P2DA1: Gear Shift Control Module B Supply Voltage Low
Standardized SAE J2012 code · P2Dxx codes
What does P2DA1 mean?
Supply voltage on the gear shift control module B is below the expected window.
The code tells you which monitor failed, not which part is broken. Test before replacing parts.
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
Common causes
- High Module supply fuse blown
- Medium Wiring fault
Likelihood is a general estimate across vehicles; your make and model may differ.
Add your car to see reports of P2DA1 on the same make and model first.
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