P0B2CHybrid/EV Battery C Voltage Unstable
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0B2C indicates that the voltage of hybrid/EV battery C is unstable, meaning it changes faster or further than plausible for the current load, while a steady deviation would set P0B2D or P0B2E. No manufacturer documents P0B2C publicly. The pattern is known from the A and B siblings: on the Jeep Wrangler 4xe and Grand Cherokee 4xe, P0B24 and P0B28 were cured with battery controller software, and Ford fixed P0B24 on the Mach-E the same way. CARB requires the voltage sensors of the hybrid storage to be monitored for circuit and rationality faults. Physically, a loose busbar screw, a corroded sense terminal or a cell with high internal resistance can make the voltage of unit C jump, so the warning often comes and goes.
- What you may notice
- Hybrid/EV system or high-voltage battery warning on
- MIL on
- Warning comes and goes, fault often stored as intermittent
- Battery power limited, less electric drive or assist
- Likely causes
- PossibleLoose busbar, terminal or sense contact in battery C
- PossibleBattery controller software (pattern known from P0B24/P0B28)
- RareCell with rising internal resistance in battery C
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €80 – €3,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.