P0BBCHybrid/EV Battery Voltage Sense Z Circuit Intermittent/Erratic
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0BBC closes the generic block of 26 cell voltage channels from A to Z; after it J2012 moves on to pack-level codes such as P0BBD and P0BBE. The code is meant for a Z signal that is unstable rather than absent. There is no manufacturer documentation for it: GM monitors channel Z from the 2011 Volt to the 2019 battery energy control module, but always with P0BB8 to P0BBB only, and no table contains an intermittent monitor. Its basis is CARB 1968.2, which requires battery voltage sensors of hybrid storage systems to be checked and faults to be narrowed down to the smallest replaceable unit. Should it appear, contacts that fail under vibration or heat cycling are the logical starting point.
- What you may notice
- Warning lamp appearing irregularly
- Occasional brief loss of electric drive power
- Likely causes
- LikelyIntermittent contact on sense lead Z
- PossibleJoint at channel Z opening with heat cycling
- RareCorrosion in the Z sense connector
- 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: €80 – €5,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.