P0B70Hybrid/EV Battery Voltage Sense K 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
- P0B70 says that cell voltage K reads too high to be genuine. GM's 2019 battery energy control module sets it at 4.8 V or more, held for 1.4 s within 2 s, as a Type A fault with immediate MIL, and only when no communication loss, open sense line or internal module fault takes precedence. The same principle appears with other numbers elsewhere at GM: 4.65 V and 7 of 10 samples on the BAS Plus mild hybrid, 23 V for nickel-metal hydride block 11 on the 2012 two-mode trucks. The difference to P0B6F is the direction, not the location: a high reading typically comes from a lead touching a higher potential, a low one from a short to a lower one. Charging is usually blocked while it is active.
- What you may notice
- Charging blocked
- MIL and power limitation
- Likely causes
- LikelyChannel K lead in contact with a higher tap
- PossibleFloating measuring input after loss of its lower reference
- RareCell monitoring chip fault
- 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.