P0E4BHybrid/EV Battery Pack Voltage Sense F Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0E4B sets when pack voltage measurement F falls below its plausible minimum, which normally points to a sense path shorted to ground, an open sense fuse or a defective input of the battery controller. No manufacturer documents P0E4B publicly. As a reference, the battery energy control module in GM's 2019 hybrid tables sets the channel A code P0ABC when pack-side voltage stays under 24 V for 1.6 s within a 2 s window, Type A, one trip, as long as system voltage is at least 9 V. CARB requires out-of-range checks of battery voltage sensors. P0E4C is the high counterpart, P0E4A the plausibility fault, and the matching low code of channel E is P0E46. Because precharge and contactor checks rely on the reading, the vehicle may not reach ready mode.
- What you may notice
- No ready mode or contactors do not close
- MIL and high-voltage warning on
- Likely causes
- LikelyChannel F sense lead shorted to ground or pack housing
- PossibleOpen fuse or resistor in the channel F sense path
- RareFailed analog input of the battery controller
- 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 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.