Powertrain, generic

P0E45 Hybrid/EV Battery Pack Voltage Sense E Circuit Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0E45 says pack voltage measurement E delivers a value that is electrically valid but does not fit the rest of the battery data. Such a rationality test usually compares the channel with the summed block or cell voltages, or with a second pack measurement. No manufacturer documents P0E45 publicly. GM's 2013 two-mode hybrid trucks (Tahoe, Yukon, Escalade, Silverado, Sierra) show the method on channel A: their battery pack control module fails P0ABB once the gap between pack voltage and the added-up block voltages exceeds 50 V in 70 of 80 checks taken every 100 ms, Type A, one trip. CARB requires plausibility monitoring for battery voltage sensors. Circuit, low, high and erratic faults of channel E are P0E44, P0E46, P0E47 and P0E48. Battery power is usually limited.

Likely causes

Corroded or loose sense connection adding resistance and skewing the reading
Drifting measuring stage or outdated software in the battery controller
Fault in the reference value, e.g. a block or cell voltage channel

Symptoms

  • Warning light with reduced hybrid or electric power
  • Displayed state of charge or range jumps unexpectedly

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 ewiring harnessbms

Related codes

P0E44P0E46P0E47P0E48P0E4AP0ABB

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