Powertrain, generic · Hybrid propulsion

P0A1F Battery Energy Control Module A Performance

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

The battery energy control module supervises cell voltages, current and temperatures of the high-voltage pack. P0A1F reports that this module failed its own integrity checks. In GM hybrid tables (2011) a single reset of the module by its software watchdog is enough, and the code sets in one trip. GM told dealers for the 2011-2012 Chevrolet Volt not to replace the module for P0A1F but to install a new calibration. FCA lists subtype P0A1F-09, internal component failure, on the 2018 Jeep Wrangler with eTorque and also fixes it by reflashing the battery pack control module. Lost communication with the module is U0111. Expect a MIL and limited hybrid function.

Likely causes

Module software fault, fixed by a new calibration
Internal hardware fault of the battery control module
Unstable 12 V supply causing module resets

Symptoms

  • MIL or service engine soon light on
  • Battery or hybrid warning, limited electric operation
  • Start-stop may be disabled

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€50–3,000
Time0.3–6 h

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

Parts involved

battery energy control modulehv battery

Related codes

U0111P0A7FP0A80P0A1D

References: gsi.ext.gm.com, static.nhtsa.gov, static.nhtsa.gov.