P0B6BHybrid/EV Battery Voltage Sense J 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
- On GM's 2012 two-mode hybrid trucks the battery is divided into 20 nickel-metal hydride blocks, and channel J is block 10. The battery pack control module samples it every 100 ms while the 12 V supply is between 9 and 18 V; if block 10 reports more than 23 V in 15 of 20 samples, P0B6B is stored as Type B, so the MIL comes on after the second trip. Lithium-ion GM packs check single cells instead and set the code at 4.8 V or more for 1.4 s within 2 s, Type A; the BAS Plus mild hybrid uses 4.65 V. Since these limits lie well above any real charge level, a wiring short to a higher tap or a faulty sense input is the expected finding, not an overcharged battery.
- What you may notice
- MIL after the second drive (Type B systems)
- Charging or regeneration restricted
- Reduced electric power
- Likely causes
- LikelyChannel J lead shorted to a higher block or cell tap
- PossibleFaulty measuring input in the battery pack control module
- 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.