P0BA2Hybrid/EV Battery Voltage Sense U Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- 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.
- What you may notice
- MIL and hybrid or EV warning
- Charging stopped early
- Likely causes
- LikelySense lead U in contact with a higher potential
- PossibleMeasuring IC misreading channel U
- RareCell U actually overcharged
- 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: €100 – €6,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.