P0B6FHybrid/EV Battery Voltage Sense K 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
- GM's BAS Plus mild hybrid, the eAssist system in table 13OBDG05C, gives P0B6F a simple rule: if the cell sense line for channel K measures below 1.4 V in 7 of 10 samples at 200 ms while the 12 V supply is above 8.8 V, the code is stored as Type B, two trips. Since a lithium-ion cell in use never falls that low, the value must come from a short or a failed input. GM's later battery energy control modules work with 0.2 V and a 1.4 s window, Type A, and the 2012 two-mode trucks with nickel-metal hydride blocks 11 and 12, both under 2 V. The driver typically sees a hybrid warning and loses electric assist; the engine takes over more of the work.
- What you may notice
- Hybrid warning and MIL after the second trip
- Auto stop and electric assist disabled
- Likely causes
- LikelyChannel K sense line shorted to ground or a lower tap
- PossibleFailed measuring input in the battery interface module
- RareBlown protective element in the sense line
- 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 – €5,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.