P0B8FHybrid/EV Battery Voltage Sense Q 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
- P0B8F closes the channel Q group and stands for a sense Q signal that is erratic rather than absent or out of range. No manufacturer documents this code publicly. GM's tables for sense Q, from the 2011 Volt to the 2019 battery controllers, list circuit, range, low and high monitors only, and the Ford Fusion bulletin ends four channels earlier at N. CARB 1968.2 forms the basis: it calls for monitoring of the battery voltage sensors in a hybrid energy storage system and for codes that lead a technician to the faulty part. Physically, an erratic Q reading would point to an unstable connection between tap and measuring chip, such as a cracked crimp, a damaged flexible circuit or a cold solder joint. The next channel, R, starts at P0B90.
- What you may notice
- Sporadic hybrid or EV warning
- Power briefly reduced, normal after restart
- Likely causes
- LikelyCracked crimp at the channel Q tap
- PossibleDamaged flexible circuit between cells and monitoring board
- RareCold solder joint at the measuring chip
- 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.