P0BB2Hybrid/EV Battery Voltage Sense X 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
- Of the five X codes, P0BB2 is the only one without any public manufacturer description. It is intended for a sense X signal that flickers, drops out briefly or jumps between values. GM's Volt tables of 2011 and 2016 list channel X with circuit, range, low and high monitors, P0BAE to P0BB1, and no intermittent check. The code therefore rests on the J2012 structure and on CARB 1968.2, which requires hybrid battery voltage sensors to be monitored and the fault to be isolated to the smallest replaceable unit. In practice a technician would look for a contact that opens under vibration, moisture in a connector or a harness rubbing against the module housing.
- What you may notice
- Intermittent warning lamp
- Sporadic hybrid system message
- Likely causes
- LikelyContact on lead X opening under vibration
- PossibleMoisture or corrosion in the X sense connector
- RareHarness X chafing against the module housing
- 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.