Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSSUBARU2022IMPREZA BASE, 4D SEDAN, AUTOMATIC CVT TRANSREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 23 (P-HEV HYBRID POWERTRAIN CONTROL SYSTEM (DIAGNOSTICS) (3 OF 4))DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)DTC P162B-87: LOST COMMUNICATION WITH AUXILIARY BATTERY MONITOR MODULE MISSING MESSAGENOTES

2022 Subaru Impreza Base, 4D Sedan, Automatic CVT Trans

DTC P162B-87: Lost Communication With Auxiliary Battery Monitor Module Missing Message: Notes

2022 Subaru Impreza Base, 4D Sedan, Automatic CVT TransSECTION Notes

WARNING: This page is about a different car, the 2022 Subaru Crosstrek. However, it is still accessible from the selected car via links, so may be relevant.

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Outline of diagnosis:

Diagnosis condition:
- IG ON
  Malfunction condition:
- Hybrid vehicle control ECU assembly or Battery (12V) sensor is unable to receive LIN communication
  Faulty period:
- Continues for 17 minutes or more
  Trip count:
- One trip
  Trouble symptom:
  
  DC/DC Converter command fixed
  
  Wiring diagram:
  
  Hybrid system Ref. to WIRING SYSTEM (CROSSTREK MODEL (HEV))>HYBRID ELECTRIC VEHICLE SYSTEM>WIRING DIAGRAM .
Courtesy of SUBARU OF AMERICA, INC.

CAUTION:
Before performing diagnosis, refer to "CAUTION" in "General Description". Ref. to P-HEV HYBRID POWERTRAIN CONTROL (DIAGNOSTICS)>GENERAL DESCRIPTION>CAUTION .

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

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.