P0BAEHybrid/EV Battery Voltage Sense X Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- Channel X, number twenty-four, starts with P0BAE, the open-lead code. The first-generation Volt of 2011 already detected it through several cases: two neighbouring readings more than 1 V apart, a busbar sense voltage above 0.7 V combined with an implausible cell voltage, or adjacent cells differing by more than 0.5 V on a shared supply line. GM's later 16OBDG02 programme measures the sense line resistance directly and fails it above 30.00 in seven of nine samples, Type A; the unit is not printed. In the 2019 battery energy control module the familiar 1.3 V and 36 mV criteria apply with 0.8 s in 1.6 s. Whichever method is used, the controller loses sight of one cell and normally restricts the battery.
- What you may notice
- MIL and service message for the high-voltage system
- Vehicle may stay out of ready mode
- Charging stops early
- Likely causes
- LikelySense lead X broken or disconnected
- PossibleLoose busbar fastener at the X sensing point
- RareSense harness X damaged during earlier battery work
- 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: €150 – €7,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.