P0BB7Hybrid/EV Battery Voltage Sense Y 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
- P0BB7 would describe an unstable sense Y signal, one that is mostly correct but drops out or jumps from time to time. No manufacturer publishes a monitor for it. Where GM covers channel Y, in the 16OBDG02 programme and the 2019 battery and hybrid processor tables, it does so with P0BB3 to P0BB6: line resistance, trend comparison, low and high limits. A brief interruption would there show up as a counted failure inside one of those tests rather than under its own code. P0BB7 thus exists as a J2012 placeholder that satisfies the CARB 1968.2 demand for monitored battery voltage sensors. Diagnosis would focus on connectors, crimps and solder joints that react to movement or heat.
- What you may notice
- Warning lamp appears now and then
- Short-lived power limitation
- Likely causes
- LikelyIntermittent contact in the Y sense connector
- PossibleCrimp or weld on lead Y opening when hot
- RareHairline crack in a solder joint of input Y
- 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.