P0B97Hybrid/EV Battery Voltage Sense S Circuit Low
- 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 P0B97 the controller sees sense S pulled close to zero. In the 2012 two-mode trucks, where S is the nickel-metal hydride block 19, the battery pack control module only sets it when block 19 and block 20 are both below 2 V in 15 of 20 samples, Type B, with the 12 V system between 9 and 18 V. GM's lithium-ion packs work cell by cell: 0.2 V or less for 1.4 s in 2 s on the 2016 Volt and the 2019 controller, Type A, and under 0.20 V in 14 of 18 samples in the 16OBDG02 programme. The eAssist mild hybrid sets it below 1.4 V, 7 of 10 samples, Type B. An open sense line fault takes priority, so P0B97 points more to a short than to a broken lead.
- What you may notice
- MIL and hybrid or EV warning message
- Restricted power, engine may run more often on hybrids
- Likely causes
- LikelySense lead S shorted to ground or to the next lower cell
- PossibleDefective channel S input on the monitoring board
- RareCell or NiMH block on channel S actually discharged
- 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.