Powertrain, generic

P0E44 Hybrid/EV Battery Pack Voltage Sense E Circuit

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modePossible

P0E44 is the basic circuit code for the fifth pack voltage measurement, channel E, which follows channels A to D (P0ABA, P0B14, P0B19, P0B1E) in the code list. The battery controller stores it when this input is electrically unusable, for example open, without a plausible raw value or failing a self-test of its measuring stage, and none of the more specific low, high or erratic codes fits. No manufacturer documents P0E44 publicly, and which tap a maker labels E is its own decision. CARB requires every voltage sensor of the hybrid energy storage system to be monitored as an input component, with codes narrowing the fault down to a replaceable part. Without this value the controller restricts or blocks high-voltage operation.

Likely causes

Open or unplugged voltage sense lead or connector inside the pack

Faulty measuring stage or input of the battery controller

Blown fuse or open resistor in the sense path

Symptoms

Hybrid or high-voltage system warning lit
Reduced electric assist or limited battery power
Vehicle may not switch to ready mode

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

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