Powertrain, generic

P0ECC Hybrid/EV Battery E Voltage

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P0ECC is the general voltage code for hybrid/EV battery E. The letters A to F mark separately monitored sub-batteries, modules or energy stores of one system; E is the fifth, so the code can only occur where a manufacturer divides its storage into at least five such units. It signals a voltage of this unit that does not fit expectation, without saying whether it fluctuates (P0ECD), sits too low (P0ECE) or too high (P0ECF). No manufacturer documents P0ECC publicly. CARB asks for monitoring of the cells and voltage sensors of hybrid storage with codes that name the smallest replaceable unit, which explains such letter series. As a pack-level reference, GM's P0ABB compares pack voltage with the cell sum at a 12 V limit. The driver sees a battery warning.

Likely causes

Aged or damaged cells in unit E
Fault in the voltage sense leads or connectors of unit E
Battery controller measuring or software fault

Symptoms

  • Battery or hybrid warning, MIL
  • Reduced electric power and range

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

P0ECDP0ECEP0ECFP0ED0P0B2FP0ABB

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