P0B46Hybrid/EV Battery Voltage Sense C 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
- With P0B46 the channel C wiring is intact; the value on it looks plausible but no longer behaves like a real cell. GM's 2019 tables run the test in Hybrid Powertrain Control Processor 2: whenever the average cell voltage trends by at least 0.005 V in one direction, channel C has to follow; if it stays frozen in 35 of 40 samples at 100 ms, the code sets, Type A. The 2016 Chevrolet Volt uses a window of 7 out of 8 seconds instead. Chrysler calls the code Voltage Sense 3 Circuit Performance on the 2020 Pacifica plug-in hybrid and cures it by reflashing the battery pack control module. So before opening the battery, check the controller software level.
- What you may notice
- MIL on without noticeable driving fault
- Reduced electric power or hybrid assist
- Contactor or precharge codes stored at the same time (Pacifica)
- Likely causes
- LikelyBattery controller software misjudging the channel, fixed by reflash (Chrysler Pacifica PHEV)
- PossibleMeasuring chip input for channel C stuck at a constant value
- RareHigh-resistance cell tap damping the channel C 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 – €6,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.