P0A1FBattery Energy Control Module A Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- 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.
- What you may notice
- MIL or service engine soon light on
- Battery or hybrid warning, limited electric operation
- Start-stop may be disabled
- Likely causes
- LikelyModule software fault, fixed by a new calibration
- PossibleInternal hardware fault of the battery control module
- RareUnstable 12 V supply causing module resets
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €50 – €3,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.