2023 Subaru Forester BaseFACTORY OEM SERVICE PROCEDURE

DTC P1536: Battery Monitor Module Current Too High: Notes

DTC detecting condition: 

Immediately at fault recognition

NOTE: After the faulty parts are repaired or replaced, perform the final check in Basic Diagnostic Procedure. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE .
  1. CHECK DTC  .
    1. Turn the ignition switch to ON.
    2. Using the Subaru Select Monitor or a general scan tool, read the DTC of [Engine]. Ref. to COMMON (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

    Is DTC P058A displayed? (Current code or history code)

    Yes:  Check for DTC P058A. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC P058A BATTERY MONITOR MODULE PERFORMANCE .

    No:  Go to  2.

  2. CHECK FREEZE FRAME DATA  .

    Using the Subaru Select Monitor, read the values in [Battery Terminal Voltage], [Battery Charge/Discharge Current] and [Estimated Battery Temperature].

    NOTE: For detailed operation procedures, refer to "COMMON (DIAGNOSTICS)". Ref. to COMMON (DIAGNOSTICS)>FREEZE FRAME DATA .

    Is [Battery Terminal Voltage] 14.3 V, is [Battery Charge/Discharge Current] 0 A, and is [Estimated Battery Temperature] 20°C (68°F)? (Check the value that is before confirming malfunction)

    NOTE: If it is fixed to the failsafe value ([Battery Terminal Voltage]: 14.3 V, [Battery Charge/Discharge Current]: 0 A, [Estimated Battery Temperature]: 20°C (68°F)) before confirming malfunction, it can be judged that DTC was detected due to malfunction occurrence during self-diagnosis of the battery sensor. Therefore, check P058A.

    Yes:  Check for DTC P058A. Ref. to ENGINE (DIAGNOSTICS) (H4DO)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC P058A BATTERY MONITOR MODULE PERFORMANCE .

    No:  Go to  3.

  3. CHECK DTC  .

    Using the Subaru Select Monitor or a general scan tool, read the DTC of [Engine]. Ref. to COMMON (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

    Is DTC P1536 displayed? (Current code)

    Yes:  Replace the battery sensor. Ref. to STARTING/CHARGING SYSTEMS (H4DO)>BATTERY SENSOR .

    No:  Even if DTC is detected, it has returned to a normal condition at this time. Reproduce the failure, and then perform the diagnosis again.

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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.