2020 Subaru Outback BaseFACTORY OEM SERVICE PROCEDURE

Diagnostic Trouble Code (DTC): List

DTC Description & trouble part Reference
B1A00 Front Relay Control Module Non-Volatile Memory Refer to FRONT RELAY CONTROL MODULE (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B1A00 FRONT RELAY CONTROL MODULE NON-VOLATILE MEMORY .
B1A01 Front Relay Control Module Battery(Control) Power Supply Refer to FRONT RELAY CONTROL MODULE (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B1A01 FRONT RELAY CONTROL MODULE BATTERY(CONTROL) POWER SUPPLY .
B1A02 Front Relay Control Module Battery(Buck Up) Power Supply Refer to FRONT RELAY CONTROL MODULE (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B1A02 FRONT RELAY CONTROL MODULE BATTERY(BUCK UP) POWER SUPPLY .
B1A03 Front Relay Control Module IG Power Supply Refer to FRONT RELAY CONTROL MODULE (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B1A03 FRONT RELAY CONTROL MODULE IG POWER SUPPLY .
B1A04 Head Lamp Lo LH Circuit Current High Refer to FRONT RELAY CONTROL MODULE (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B1A04 HEAD LAMP LO LH CIRCUIT CURRENT HIGH .
B1A06 Head Lamp Lo RH Circuit Current High Refer to FRONT RELAY CONTROL MODULE (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B1A06 HEAD LAMP LO RH CIRCUIT CURRENT HIGH .
B1A08 Head Lamp Hi LH Circuit Current High Refer to FRONT RELAY CONTROL MODULE (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B1A08 HEAD LAMP HI LH CIRCUIT CURRENT HIGH .
B1A0A Head Lamp Hi RH Circuit Current High Refer to FRONT RELAY CONTROL MODULE (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B1A0A HEAD LAMP HI RH CIRCUIT CURRENT HIGH .
B1A0C Front Relay Control Module CAN Register Stuck Refer to FRONT RELAY CONTROL MODULE (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B1A0C FRONT RELAY CONTROL MODULE CAN REGISTER STUCK .
U0074 CONTROL MODULE COMMUNICATION BUS "BODY-CAN" OFF Refer to FRONT RELAY CONTROL MODULE (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0074 CONTROL MODULE COMMUNICATION BUS "BODY-CAN" OFF .
U0122 LOST COMMUNICATION WITH VEHICLE DYNAMICS CONTROL MODULE Refer to FRONT RELAY CONTROL MODULE (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0122 LOST COMMUNICATION WITH VEHICLE DYNAMICS CONTROL MODULE .
U0140 LOST COMMUNICATION WITH BODY CONTROL MODULE Refer to FRONT RELAY CONTROL MODULE (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0140 LOST COMMUNICATION WITH BODY CONTROL MODULE .
U0416 INVALID DATA RECEIVED FROM VEHICLE DYNAMICS CONTROL MODULE Refer to FRONT RELAY CONTROL MODULE (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0416 INVALID DATA RECEIVED FROM VEHICLE DYNAMICS CONTROL MODULE .
U0422 INVALID DATA RECEIVED FROM BODY CONTROL MODULE Refer to FRONT RELAY CONTROL MODULE (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0422 INVALID DATA RECEIVED FROM BODY CONTROL MODULE .
Factory Service Tools

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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.

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