P0B64Hybrid/EV Battery Voltage Sense I 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
- P0B64 is a rationality fault: channel I is connected and reads a believable number, yet it does not move with the other cells. GM's 2016 Chevrolet Volt compares the movement of each cell with the average; if channel I does not follow when the average moves by more than 0.022 V, 7 out of 8 seconds fail the check, Type A. The 2019 hybrid powertrain control processor 2 tables keep the idea but count samples, 35 failures out of 40 at 100 ms. On the 2012 two-mode trucks the same code belongs to nickel-metal hydride block 9, whose scaled value must stay within 70 V of the pack voltage. Because the input is alive but stuck or drifting, a software update or the monitoring board is a likelier fix than wiring.
- What you may notice
- MIL on, vehicle drives normally
- Reduced hybrid assist or electric range
- Likely causes
- LikelyChannel I measuring input frozen at a constant value
- PossibleBattery controller software misjudging the channel
- RareHigh-resistance cell tap damping the signal
- 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 – €5,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.