P0B61Hybrid/EV Battery Voltage Sense H Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- A lithium-ion cell cannot sit much above about 4.2 V, so when channel H reads 4.8 V or more the GM battery energy control module concludes the sense circuit is wrong and stores P0B61 after 1.4 s within a 2 s window, Type A. GM's BAS Plus mild hybrid sets the same code at more than 4.65 V on the cell sense line in 7 of 10 samples, Type B, while the 2012 two-mode hybrids treat H as nickel-metal hydride block 8 and only object above 23 V in 15 of 20 samples, Type B. A high reading usually comes from a sense lead touching a higher potential or from a monitoring input that floats when a reference connection is lost. Unlike P0B60 the controller here suspects overvoltage, so charging is typically blocked.
- What you may notice
- Charging refused or stopped early
- MIL with reduced electric power
- Likely causes
- LikelyChannel H sense lead in contact with a higher cell tap
- PossibleLost reference connection letting the measuring input float
- RareInternal fault of the cell monitoring 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: €100 – €6,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.