P0B24 code meaning
Hybrid/EV Battery A Voltage Unstable
Powertrain system Generic code P0Bxx codes Check engine light
What P0B24 means
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.
P0B24 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor0.5 to 8 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0B24
- 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
Common causes of P0B24
- Most likelyBattery controller software (Jeep 4xe BPCM/HCP, Ford BECM updates)
- PossibleLoose busbar, terminal or sense contact in battery A
- Less likelyCell with rising internal resistance in battery A
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Hv battery aBms
What each part of P0B24 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| B | Area: hybrid propulsion. |
| 24 | The exact fault in that area. |
What to do next
- Note P0B24 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0B24
What does P0B24 mean?
P0B24 means "Hybrid/EV Battery A Voltage Unstable". 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). It is a generic code, so it means the same on every make.
Is it safe to drive with P0B24?
Drive gently and only to a workshop. With P0B24 the car can go into limp mode (reduced power) to protect itself.
Will P0B24 fail an emissions test?
Yes, it can. P0B24 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0B24 to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 8 hours of work. This is a job for a workshop.
Will P0B24 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.