P0B95Hybrid/EV Battery Voltage Sense S 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
- P0B95 reports that the sense S lead, channel nineteen, no longer connects its cell reliably to the monitoring electronics. GM programmes with a separate battery sensor module (16OBDG02) measure this directly: after each normal reading the balancing gates switch in a test pattern, current flows through the sense wires and the voltage drop is turned into a line resistance. Above 30.00 (the table gives no unit) in 7 of 9 samples at 100 ms, the code sets as Type A. GM's eAssist mild hybrid instead needs lines N and N-1 both under 1.4 V plus a jump of more than 0.5 V in 200 ms, 7 of 10 samples, Type B, and stays quiet while P1B37 is active. The 2019 lithium-ion controller uses its seven cases with 0.8 s in 1.6 s.
- What you may notice
- MIL and hybrid or EV warning
- Vehicle may refuse ready mode
- Cell balancing no longer effective
- Likely causes
- LikelyHigh resistance in sense lead S from corrosion or a loose terminal
- PossibleSense lead S broken at the cell connector
- RareDefective input of the battery sensor module for 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: €150 – €6,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.