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HOMESERVICE MANUALSSUBARU2014OUTBACK 2.5I, STANDARD TRANSREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTCOMMUNICATION DEVICESLAN COMMUNICATION SYSTEM (DIAGNOSTICS)DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)DTC U0073 CONTROL MODULE COMMUNICATION BUS "A" OFFTROUBLE SYMPTOM
2014 Subaru Outback 2.5i, Standard Trans

DTC U0073 Control Module Communication Bus "A" Off: Trouble Symptom

2014 Subaru Outback 2.5i, Standard TransSECTION Trouble Symptom

CAN communication is not normal.

DIAGNOSTIC PROCEDURE

Step Check Yes No
1 CHECK DTC. 
  1. Start the engine.
  2. Using the Subaru Select Monitor, read DTC of all the systems.
 Is U0073 a current malfunction? Go to step 2  . It may be a temporary poor contact. Perform the clear memory.
2 CHECK CAN COMMUNICATION CIRCUIT. 
Check CAN communication circuit. Refer to BUS "A" (MAIN-CAN) .		 Is CAN communication circuit faulty? Repair the faulty portion, following the diagnosis procedure. Go to step 3  .
3 CHECK DTC. 
  1. Start the engine.
  2. Using the Subaru Select Monitor, read DTC of all the systems.
 Is U0073 a current malfunction? Go to step 4  . System is normal.
4 CHECK CONTROL MODULE. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the control modules other than body integrated unit in order.
    NOTE: When disconnecting ECM or VDC CM, connect resistance of 120 Ω between CAN Hi and CAN Lo as an alternative of end resistance.
  3. Turn the ignition switch to ON.
  4. Using the Subaru Select Monitor, read DTC of CAN system.
 Is there any control module that U0073 is not detected as current malfunction? Replace the control module. Repeat  1) to  4) in step 4 until U0073 is not detected.
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.