P0B7DHybrid/EV Battery Voltage Sense N 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
- P0B7D concerns a channel N value that stays inside its limits yet does not behave like a real cell. GM's 2016 tables show how the same check is tuned per vehicle: the Chevrolet Volt fails when cell N does not move with the average for 7 of 8 seconds, while the Cadillac ELR counts 20 of 40 samples at 200 ms once the average shifts by more than 0.006 V; both are Type A. On the 2012 two-mode hybrids N corresponds to NiMH block 14, and blocks 14 and 15 scaled by twenty must agree with the pack voltage within 70 V, otherwise 160 of 170 samples set a Type B code. The 2019 processor uses its 0.005 V trend test, 35 of 40 samples. Often a battery controller reflash or a board repair is the fix.
- What you may notice
- MIL with hybrid service message
- Shorter electric range or less assist
- Likely causes
- LikelyChannel N value not tracking the other cells
- PossibleOutdated battery controller calibration
- RareBlock 14 or 15 voltage mismatch on two-mode NiMH packs
- 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.