Powertrain, generic · Hybrid propulsion

P0BE4 Drive Motor Inverter Temperature Sensor F Circuit Intermittent/Erratic

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

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.

Likely causes

Loose, corroded or vibrating connector at the inverter
Cracked solder joint on the inverter sensing board
Ageing thermistor with unstable resistance

Symptoms

  • Malfunction indicator lamp that comes and goes
  • Occasional power reduction of drive motor B

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–4,000
Time1–6 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

drive motor inverter temp sensor fwiring harnesshybrid control module

Related codes

P0BE0P0BE1P0BE2P0BE3P0BDAP0BDF

References: law.cornell.edu, gsi.ext.gm.com, gsi.ext.gm.com.