P0BADHybrid/EV Battery Voltage Sense W 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
- P0BAD is reserved for a W signal that drops out or jumps for short moments instead of failing outright. No manufacturer documents the code publicly. GM monitors channel W in several programmes, from the 2011 Volt to the eAssist and the 2019 tables, but only through P0BA9 to P0BAC; none of them contains an intermittent test. The slot exists because J2012 gives every sense channel five codes and CARB 1968.2 requires the battery voltage sensors of a hybrid energy storage system to be monitored with fault codes that point to the smallest replaceable part. If a vehicle did store it, the usual suspects would be a crimp or connector that loses contact under vibration or with temperature changes.
- What you may notice
- Warning lamp that comes and goes
- Occasional short power reduction
- Likely causes
- LikelyLoose or fretting connector pin on lead W
- PossibleCrimp on lead W opening with temperature changes
- RareCracked solder joint on the monitoring board input W
- 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.