P0BA5Hybrid/EV Battery Voltage Sense V 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
- P0BA5 describes a sense V value that stays within limits but fails a rationality check against the other cells. GM's 16OBDG02 programme demands a trend of at least 0.002 V in the same direction as the average whenever that average moves more than 0.022 V, with 35 failures in 40 evaluations giving Type A. The 2019 hybrid processor works the same way with 0.005 V. For the 2016 model year GM lists two variants: the Volt with a 7 s in 8 s window and the ELR with 0.006 V of average movement and 20 of 40 samples at 200 ms. GM's eAssist expects half the average movement, Type B. Since the test is skipped while circuit, low or high faults are active, P0BA5 alone points to the measurement rather than an open lead.
- What you may notice
- MIL, little change in driving
- Reduced regeneration or assist possible
- Likely causes
- LikelyChannel V reading stuck while other cells move
- PossibleBattery controller firmware needing reprogramming
- RareAged cell V responding differently to load
- 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.