Powertrain, generic

P0E4C Hybrid/EV Battery Pack Voltage Sense F Circuit High

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modePossible

P0E4C means pack voltage measurement F reports a value above anything the battery can produce. Common reasons are a sense line in contact with a higher potential, a lost ground reference in the measuring circuit or a faulty analog input, so the channel rather than the cells is suspect. No manufacturer documents P0E4C publicly. In GM's 2019 hybrid tables the channel A code P0ABD sets above 479 V, again 1.6 s within 2 s and Type A. CARB requires battery voltage sensors to be checked against upper and lower limits. Real overvoltage of single cells is reported by cell voltage codes such as P0DE7, while the low fault of channel F is P0E4B and the same high fault on channel E is P0E47. The controller usually blocks or limits electric operation.

Likely causes

Channel F sense line touching a higher potential

Lost ground reference or broken divider in the measuring circuit

Faulty analog input or software of the battery controller

Symptoms

Warning lamp and limited electric drive
Charging interrupted or not started

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

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