Powertrain, generic

P0E49 Hybrid/EV Battery Pack Voltage Sense F Circuit

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

Channel F is the sixth and last pack voltage measurement in this series and comes after channel E (P0E44 to P0E48). P0E49 is its general circuit fault: the battery controller cannot use the input, for instance because the sense line is open, the measuring chip reports an internal error or the raw value is missing, while no clear low, high or erratic pattern applies. No manufacturer documents P0E49 publicly. Systems that compare several high-voltage measurements, as GM's 2019 hybrids do between the pack sensor and the inverter and charger bus voltages, depend on every channel being valid. CARB requires all battery voltage sensors of the storage system to be monitored. The vehicle typically limits or refuses high-voltage operation.

Likely causes

Open sense lead or disconnected connector of channel F
Internal fault of the voltage measuring chip or battery controller
Moisture or corrosion in the pack-side connector

Symptoms

  • High-voltage warning and reduced power
  • Vehicle may refuse to become ready

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–2,500
Time1–6 h

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

Parts involved

hv battery pack voltage sense fwiring harnessbms

Related codes

P0E4AP0E4BP0E4CP0E4DP0E44P0AF8

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