P0B98Hybrid/EV Battery Voltage Sense S 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
- P0B98 marks a sense S value that is too high to be a cell voltage. The thresholds vary with the battery chemistry and controller: GM's 2016 Volt and 2019 battery controllers flag 4.8 V or more after 1.4 s in 2 s (Type A), the 16OBDG02 programme 4.90 V in 14 of 18 samples (Type A), and the eAssist mild hybrid more than 4.65 V in 7 of 10 samples with the 12 V supply above 8.8 V (Type B). On the 2012 two-mode trucks S is NiMH block 19 and its limit is 23 V, 15 of 20 samples, Type B. Like the low test, the high test waits until open sense line faults are ruled out. The fix is usually wiring or the monitoring board; a truly overcharged cell is rare but must be excluded.
- What you may notice
- MIL and service hybrid system message
- Charging and regeneration limited
- Likely causes
- LikelySense lead S shorted to a higher cell or busbar
- PossibleMeasuring chip reading channel S incorrectly
- RareReal overvoltage of the cell or block on channel S
- 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.