The voltage sense circuit B for the generator reports a circuit b high condition. Generator output regulation may be impaired.
Medium severity. Can I keep driving?If the battery warning light comes on, you could get stranded. Turn off electrical accessories and go straight to a repair shop.
Most likely causes
- Sense wire shorted to B+
- Generator regulator overvoltage
- Pack cell imbalance approaching service threshold
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 P2CC4 means
- P: Powertrain: engine and transmission
- 2: Generic code: same on every make
- C: Subsystem depends on the code range
- C4: Specific fault in that system
Frequently asked questions
Can I keep driving with code P2CC4?
If the battery warning light comes on, you could get stranded. Turn off electrical accessories and go straight to a repair shop.
What causes code P2CC4?
The most common causes are: sense wire shorted to B+; generator regulator overvoltage; pack cell imbalance approaching service threshold.
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.