P0B5AHybrid/EV Battery Voltage Sense G Circuit Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0B5A asks whether cell channel G behaves like a real cell. GM answers that question in three ways across its programmes. The 2019 hybrid tables expect channel G to trend with the average cell voltage and set the code after 35 frozen samples out of 40, Type A. The 2016 Chevrolet Volt uses a 7 of 8 second window, the Cadillac ELR 20 of 40 samples at 200 ms. The 2012 two-mode trucks compare block 7, multiplied by 20, with the pack voltage and fail it beyond 70 V in 160 of 170 samples, Type B. The Chrysler Pacifica bulletin stops at channel 6, so no other maker is documented for this code. A frozen or drifting measurement input is the most common cause.
- What you may notice
- MIL without obvious drivability change
- Limited hybrid assist
- Likely causes
- LikelyChannel G measuring input frozen or drifting
- PossibleBlock 7 reading out of line with pack voltage (GM two-mode)
- RareMonitoring software issue, check for updates
- 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: €50 – €6,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.