Powertrain, generic

P0ECE Hybrid/EV Battery E Voltage Low

Check engine lightOn

EmissionsRelevant

Drive cycleNot required

Limp modePossible

P0ECE sets when the voltage of hybrid/EV battery E remains below the window the controller expects for the present load and charge. Its counterparts are P0ECF for too high and P0ECD for unstable readings. No manufacturer documents P0ECE publicly. Ford publishes a comparable low test for battery A (P0B25) on its 2019 hybrids, based on calculated state of charge: if any cell reaches 0 % for 10 seconds with the main contactors closed, or for 90 seconds with them open, the code is set. A unit that discharged itself during long standstill, a module with an internal short, or a balancing circuit that keeps draining one group can pull unit E down. The controller then reduces discharge power, so electric range and boost shrink and the engine runs more often on hybrids.

Likely causes

Unit E deeply discharged after long standstill or a high self-discharge cell

Internal short or capacity loss in a module of unit E

Balancing switch stuck on and draining one cell group

Voltage sense fault reading low

Symptoms

Reduced electric range and acceleration
Engine starts more often, EV mode unavailable
MIL and battery warning

Repair estimate

DifficultyShop_onlyWorkshop job

Parts and labour€100–4,000

Time1–10 h

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

Parts involved

hv battery ebms

Related codes

P0ECC P0ECD P0ECF P0ED2 P0B25 P0ABC

References: fordservicecontent.com, law.cornell.edu.