P0BA2 code meaning
Hybrid/EV Battery Voltage Sense U Circuit High
Powertrain system Generic code P0Bxx codes Check engine light
What P0BA2 means
P0BA2 flags an excessive voltage on channel U. GM's eAssist mild hybrid uses the lowest threshold of the documented systems: above 4.65 V in 7 of 10 samples with the 12 V supply above 8.8 V, Type B. The 2016 Volt and the 2019 battery controller set it at 4.8 V or more held for 1.4 s within 2 s, Type A; the 16OBDG02 programme at above 4.90 V in 14 of 18 samples, Type A. As with the low code, the high test is held back while an open sense line or module communication fault is active. Channel U does not exist on the twenty-block two-mode trucks. Before replacing parts, the actual cell voltage should be measured, because a lead touching a higher potential is far more common than a real overcharge.
P0BA2 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor1 to 8 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0BA2
- MIL and hybrid or EV warning
- Charging stopped early
Common causes of P0BA2
- Most likelySense lead U in contact with a higher potential
- PossibleMeasuring IC misreading channel U
- Less likelyCell U actually overcharged
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Hv battery voltage sense uWiring harnessBms
What each part of P0BA2 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. |
| A2 | The exact fault in that area. |
What to do next
- Note P0BA2 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 P0BA2
What does P0BA2 mean?
P0BA2 means "Hybrid/EV Battery Voltage Sense U Circuit High". P0BA2 flags an excessive voltage on channel U. It is a generic code, so it means the same on every make.
Is it safe to drive with P0BA2?
Drive gently and only to a workshop. With P0BA2 the car can go into limp mode (reduced power) to protect itself.
Will P0BA2 fail an emissions test?
Yes, it can. P0BA2 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 P0BA2 to fix?
Difficulty: workshop only. A typical repair takes 1 to 8 hours of work. This is a job for a workshop.
Will P0BA2 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.