P0A1F Possible Causes
- Faulty Battery Energy Control Module (BECM)
- Battery Energy Control Module (BECM) harness is open or shorted
- Poor electrical connection in Battery Energy Control Module (BECM) circuit
What Does It Mean?
First Diagnose P0A1F Code
Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.
P0A1F Possible Symptoms
Illuminated engine light (or service engine soon warning light)
P0A1F Description
Battery Energy Control Module Internal Performance The Battery Energy Control Module (BECM) will diagnose its own systems and determine when a fault condition is present. System diagnostics and status are communicated from the Battery Energy Control Module to the Hybrid Powertrain Control Module via serial data. The Hybrid Powertrain Control Module is the host controller for Diagnostic Trouble Code (DTC) information. The EBECM monitor detects a controller random access memory (RAM), read only memory (ROM), erasable programmable read only memory (EPROM), or stack overflow. The EBECM sets the OBDII code when the RAM, ROM, EPROM, or controller stack overflow does not meet factory specifications.
This diagnostic applies to the microprocessor internal integrity conditions within the Battery Energy Control Module. This fault is internal to the Battery Energy Control Module and no external circuits are involved.