P0B6B code meaning
Hybrid/EV Battery Voltage Sense J Circuit High
Powertrain system Generic code P0Bxx codes Check engine light
What P0B6B means
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.
P0B6B at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor1 to 8 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0B6B
- MIL after the second drive (Type B systems)
- Charging or regeneration restricted
- Reduced electric power
Common causes of P0B6B
- Most likelyChannel J lead shorted to a higher block or cell tap
- PossibleFaulty measuring input in the battery pack control module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Hv battery voltage sense jWiring harnessBms
What each part of P0B6B means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| B | Area: hybrid propulsion. |
| 6B | The exact fault in that area. |
What to do next
- Note P0B6B and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0B6B
What does P0B6B mean?
P0B6B means "Hybrid/EV Battery Voltage Sense J Circuit High". On GM's 2012 two-mode hybrid trucks the battery is divided into 20 nickel-metal hydride blocks, and channel J is block 10. It is a generic code, so it means the same on every make.
Is it safe to drive with P0B6B?
Drive gently and only to a workshop. With P0B6B the car can go into limp mode (reduced power) to protect itself.
Will P0B6B fail an emissions test?
Yes, it can. P0B6B is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0B6B to fix?
Difficulty: workshop only. A typical repair takes 1 to 8 hours of work. This is a job for a workshop.
Will P0B6B clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.