P0ABB code meaning
Hybrid/EV Battery Pack Voltage Sense A Circuit Range/Performance
Powertrain system Generic code P0Axx codes Check engine light
What P0ABB means
P0ABB is a plausibility check: the measured pack voltage is within electrical limits but does not agree with what the individual cells add up to. GM documents it in several hybrid tables. From 2016 the battery controller flags it when pack voltage and the sum of cell voltages differ by more than 10 V in 32 of 40 samples; the 2013 table compares the pack reading with 32 times the average cell voltage and uses a 5.49 V limit. Both are Type B, so the MIL needs two trips. The check is suppressed while cell voltage circuit faults are active. P0ABC and P0ABD cover hard low or high readings, P0AF8 compares the pack sensor with the inverter bus voltage.
P0ABB at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor1 to 6 hours
- Clears after repairAfter a drive cycle
Symptoms of P0ABB
- Check engine or hybrid system warning light
- Erratic state-of-charge display
- Reduced electric power
Common causes of P0ABB
- Most likelyPack voltage measurement drifted (divider or input aging)
- PossibleFaulty cell voltage tap distorting the cell sum
- PossibleHigh-resistance busbar or sense connection
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Hv battery pack voltage sense aWiring harnessBms
What each part of P0ABB means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| A | Area: hybrid propulsion. |
| BB | The exact fault in that area. |
What to do next
- Note P0ABB 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 P0ABB
What does P0ABB mean?
P0ABB means "Hybrid/EV Battery Pack Voltage Sense A Circuit Range/Performance". P0ABB is a plausibility check: the measured pack voltage is within electrical limits but does not agree with what the individual cells add up to. It is a generic code, so it means the same on every make.
Is it safe to drive with P0ABB?
Drive gently and only to a workshop. With P0ABB the car can go into limp mode (reduced power) to protect itself.
Will P0ABB fail an emissions test?
Yes, it can. P0ABB 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 P0ABB to fix?
Difficulty: workshop only. A typical repair takes 1 to 6 hours of work. This is a job for a workshop.
Will P0ABB clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.