P0B5CHybrid/EV Battery Voltage Sense G 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
- P0B5C marks an out-of-range high reading on cell sense channel G. For a technician the quickest plausibility check is arithmetic: the sum of all cell or block readings should match the pack voltage, so a single channel that reads far too high while the total stays normal is a sensing fault. GM formalises the limits as 4.8 V or more for 1.4 s within 2 s in the battery energy control module of its lithium-ion systems, Type A, one trip, and as more than 23 V for block 7 of the 2012 two-mode trucks and SUVs, 15 of 20 samples, Type B, two trips. Overcharged cells are flagged by other codes. Until the fault is fixed, battery power and charging are limited.
- What you may notice
- MIL and hybrid or EV warning
- Charging limited or refused
- Likely causes
- LikelyChannel G sense lead touching a higher cell tap
- PossibleFaulty measuring input or reference in the module
- RareContamination or moisture on the monitoring board
- 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: €50 – €5,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.