Supply voltage on the gear shift control module B is above the expected window.
Medium severity. Can I keep driving?It depends on the symptoms. If the car is running normally you can go to a repair shop; if it goes into limp mode, drive as little as possible.
This code points to an internal problem in the control module or in the circuits that power its sensors. The cause is often voltage or wiring, not the unit itself.
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
Most likely causes
- Alternator overvoltage
- Wire shorted to B+
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: medium
- It can trigger limp mode.
What each character of P2DA2 means
- P: Powertrain: engine and transmission
- 2: Generic code: same on every make
- D: Subsystem depends on the code range
- A2: Specific fault in that system
Frequently asked questions
Can I keep driving with code P2DA2?
It depends on the symptoms. If the car is running normally you can go to a repair shop; if it goes into limp mode, drive as little as possible.
What causes code P2DA2?
The most common causes are: alternator overvoltage; wire shorted to B+.
Related codes
Sources
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.