P0B30 code meaning
Hybrid/EV Battery D Voltage Unstable
Powertrain system Generic code P0Bxx codes Check engine light
What P0B30 means
P0B30 reports an unstable voltage of hybrid/EV battery D: the measured value fluctuates beyond the limit the controller allows. It differs from P0B31 and P0B32, which stand for a lasting low or high voltage, and from the general fault P0B2F. No manufacturer documents P0B30 publicly. The sibling codes for batteries A and B show the typical background: Stellantis and Ford corrected P0B24 and P0B28 by updating the battery controller software, and Jeep even blocks starting after 49 days with P0B28. CARB requires the hybrid storage voltage sensors to be monitored. Apart from software, poor contact at busbars or sense terminals and cells with high internal resistance make the reading of unit D jump.
P0B30 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 P0B30
- 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
Common causes of P0B30
- PossibleLoose busbar, terminal or sense contact in battery D
- PossibleBattery controller software (pattern known from P0B24/P0B28)
- Less likelyCell with rising internal resistance in battery D
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Hv battery dBms
What each part of P0B30 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. |
| 30 | The exact fault in that area. |
What to do next
- Note P0B30 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 P0B30
What does P0B30 mean?
P0B30 means "Hybrid/EV Battery D Voltage Unstable". P0B30 reports an unstable voltage of hybrid/EV battery D: the measured value fluctuates beyond the limit the controller allows. It is a generic code, so it means the same on every make.
Is it safe to drive with P0B30?
Drive gently and only to a workshop. With P0B30 the car can go into limp mode (reduced power) to protect itself.
Will P0B30 fail an emissions test?
Yes, it can. P0B30 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 P0B30 to fix?
Difficulty: workshop only. A typical repair takes 0.5 to 8 hours of work. This is a job for a workshop.
Will P0B30 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.