P0B75Hybrid/EV Battery Voltage Sense L 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
- With P0B75 the battery controller rejects channel L because it reads above any value a real cell or block can reach. GM's lithium-ion systems in the 2016 Volt and the 2019 tables set it at 4.8 V or more over 1.4 s in a 2 s window, Type A, one trip; GM's BAS Plus mild hybrid at above 4.65 V in 7 of 10 samples, Type B. On the 2012 two-mode trucks, block 12 must exceed 23 V in 15 of 20 samples, sampled every 100 ms, before the code is stored as Type B. The pairing with P0B74 helps diagnosis: low points to a short downward, high to contact with a higher tap or a floating input. While it is active, charging and regeneration are normally limited to protect the pack.
- What you may notice
- Charging and regeneration limited
- MIL and hybrid or EV warning
- Likely causes
- LikelyChannel L lead touching a higher tap
- PossibleFloating measuring input after an open reference line
- RareReal overvoltage of the cell after a charging fault
- 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.