P0B24Hybrid/EV Battery A 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
- P0B24 reports that the voltage of hybrid/EV battery A is unstable: it swings or jumps more than the battery controller accepts instead of staying steadily too low or too high (P0B25, P0B26). Stellantis lists P0B24-00 with MIL on the Jeep Wrangler 4xe and Grand Cherokee 4xe, together with pack voltage variation, cell balancing and state-of-health codes; the cure is new software for the battery pack control module or, on the 2025 Wrangler, for the hybrid control processor. Some of these Jeeps would not start or reported low 12 V batteries. Ford names P0B24 in the BECM of the 2025 Mustang Mach-E Extended Range, shown with the wrench lamp and fixed by reprogramming. Hardware causes are loose busbar or sense contacts.
- What you may notice
- MIL on
- Hybrid/EV system or high-voltage battery warning on
- Vehicle may not start (Jeep 4xe)
- Warning comes and goes, fault often stored as intermittent
- Likely causes
- LikelyBattery controller software (Jeep 4xe BPCM/HCP, Ford BECM updates)
- PossibleLoose busbar, terminal or sense contact in battery A
- RareCell with rising internal resistance in battery A
- 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.