P0B92Hybrid/EV Battery Voltage Sense R 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
- P0B92 stands for an implausibly low reading on sense R. In GM's lithium-ion battery controllers of 2016 and 2019 the limit is 0.2 V or less for 1.4 s inside a 2 s window, Type A; the test is suspended while an open sense line fault is active, so a broken lead appears as P0B90 rather than P0B92. Programmes with a separate battery sensor module (GM 16OBDG02) use under 0.20 V in 14 of 18 samples. The eAssist mild hybrid applies 1.4 V, 7 of 10 samples, Type B. In the 2012 two-mode trucks R is NiMH block 18, and blocks 18 and 19 must both read under 2 V in 15 of 20 samples (Type B). A short of the sense lead to ground or to a lower cell is the classic cause.
- What you may notice
- MIL and hybrid or EV system message
- Propulsion limited, possibly no restart
- Likely causes
- LikelySense lead R chafed through and touching ground or a lower cell
- PossibleFailed input for channel R on the cell monitoring board
- RareCell or block on channel R genuinely collapsed
- 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.