P0BE4Drive Motor Inverter Temperature Sensor F Circuit Intermittent/Erratic
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0BE4 stands for brief dropouts or jumps in the signal of inverter temperature sensor F, which GM's hybrid tables place at phase W of the motor B inverter. The reading returns to normal between events, which separates it from the steady low and high faults P0BE2 and P0BE3. GM does not list this code, and no other manufacturer documents P0BE4 publicly. CARB's monitoring requirement for hybrid sensor circuits covers such intermittent faults as well. Typical sources are a connector with poor contact, a cracked solder joint or a thermistor whose resistance has become unstable. While the signal is distrusted, the controller tends to cut motor B power, and the fault can disappear before the workshop sees it.
- What you may notice
- Malfunction indicator lamp that comes and goes
- Occasional power reduction of drive motor B
- Likely causes
- LikelyLoose, corroded or vibrating connector at the inverter
- PossibleCracked solder joint on the inverter sensing board
- RareAgeing thermistor with unstable resistance
- 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 – €4,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.