Powertrain, generic

P0E46 Hybrid/EV Battery Pack Voltage Sense E Circuit Low

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modePossible

P0E46 is stored when pack voltage measurement E reads below the lowest value the connected battery could physically present. That points to the measuring path, such as a sense lead shorted to ground, a blown sense fuse or a failed input stage, not to an empty battery. No manufacturer documents P0E46 publicly. On GM's 2013 two-mode hybrid trucks the comparable channel A code P0ABC sets below 40 V, but only after the contactors have been closed for more than 200 ms, and needs 300 failures in 400 samples at 10 ms, Type A, one trip. CARB requires out-of-range checks for battery voltage sensors. The high counterpart is P0E47; a pack that is really deeply discharged sets its own codes such as P0AFA. Hybrid operation may be blocked.

Likely causes

Sense lead of channel E shorted to ground or chassis

Blown fuse or open resistor in the sense path pulling the reading down

Defective input stage of the battery controller

Symptoms

Vehicle does not become ready to drive or drops out of ready mode
Hybrid system warning and MIL lit
Electric drive or engine assist unavailable

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