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Pinpoint Test G: BISG Failure

WARNING: This page is about a different car, the 2021 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
  1. DTC Fault Trigger Conditions 
    DTC Description Fault Trigger Condition
    PCM P0A1E:00 Starter/Generator Control Module: No Sub Type Information This DTC sets when the BISG reports an internal mechanical failure

    Possible Sources 

    • Defective BISG
    • PCM
    • Wiring, terminals or connectors

  2. NOTE: Make sure battery voltage is greater than 12.2 volts prior to and during this pinpoint test.
  3. NOTE: Do not have a battery charger attached during vehicle testing.

  4. G1 PERFORM CLEAR DTC CODES

    • Ignition ON.

    Using a diagnostic scan tool, perform Clear codes. Without starting the engine perform a system diagnostic test. Did the P0A1E code return? 

    Yes  Replace BISG. REFER to: Starter Generator - 3.5L V6 PowerBoost (CN) .
    No  GO to  G2

  5. G2 BATTERY CONDITION TEST

    Did battery pass test. 

    Yes  GO to  G3
    No  REFER to: Battery .

  6. G3 VERIFY THE B+ GROUND CONNECTIONS

    • Ignition ON.

    Is battery voltage between 13-16V 

    Yes  Perform wiggle test on vehicle grounds and DC/DC connection.
    No  REFER to: Direct Current/Direct Current (DC/DC) Converter Control Module .
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