P0BA0Hybrid/EV Battery Voltage Sense U Circuit Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0BA0 tells the technician that channel U gives a number, but the number does not move with the pack. GM checks this rationality only on lithium-ion systems, since the two-mode NiMH trucks end at block 20. The Cadillac ELR of 2016 reacts to the smallest movement: when the average cell voltage changes by more than 0.006 V, cell U must follow, and 20 failures in 40 samples at 200 ms set a Type A fault. The Volt of the same year looks at 0.022 V of average movement and a 7 s in 8 s window, the 2019 hybrid processor at 0.005 V with 35 of 40 samples, and eAssist at half the average movement, Type B. Circuit, low and high faults are excluded before the test runs, so wiring is less likely than the controller.
- What you may notice
- MIL, often without driver-noticeable change
- Electric range may be reduced
- Likely causes
- LikelyMeasuring channel U holding a fixed value
- PossibleSoftware or calibration issue in the battery controller
- RareCell U behaving differently from its neighbours due to ageing
- 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: €80 – €5,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.