P0BA4Hybrid/EV Battery Voltage Sense V Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0BA4 reports an open or poorly connected sense V lead, the twenty-second channel and the last before W begins at P0BA9. GM's 2019 battery energy control module recognises it through seven cases, including 1.3 V between neighbouring cells, less than 36 mV with the balancing gate on and splice voltages above 0.1 or 0.5 V, with 0.8 s of failure in 1.6 s, Type A. The 2011 Volt already listed P0BA4 among its open sense line codes. In GM's 16OBDG02 programme a measured line resistance above 30.00 in 7 of 9 samples triggers it, in the eAssist mild hybrid low readings on lines N and N-1 together with a 0.5 V jump, Type B, gated by P1B38. Without a good sense lead the pack cannot balance or protect that cell.
- What you may notice
- MIL and hybrid or EV system warning
- Vehicle may not become ready to drive
- Charging blocked
- Likely causes
- LikelyBroken or unplugged sense lead V
- PossibleHigh-resistance splice or busbar joint on channel V
- RareCell monitoring board fault on channel V
- 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: €150 – €7,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.