SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSSUBARU2016LEGACY 2.5IREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTCOMMUNICATION DEVICESLAN COMMUNICATION SYSTEM (DIAGNOSTICS)DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)DTC U0074 CONTROL MODULE COMMUNICATION BUS "BODY-CAN" OFFTROUBLE SYMPTOM
2016 Subaru Legacy 2.5i

DTC U0074 Control Module Communication Bus "Body-Can" Off: Trouble Symptom

2016 Subaru Legacy 2.5iSECTION Trouble Symptom

CAN communication is not normal.

DIAGNOSTICS PROCEDURE

Step Check Yes No
1 CHECK PERFORMING OF BASIC DIAGNOSTIC PROCEDURE.  Was the basic diagnostic procedure performed up to STEP 8? Go to step 2  . Perform the basic diagnostic procedure. < Ref. to BASIC DIAGNOSTIC PROCEDURE . >
2 CHECK DTC. 
  1. Start the engine.
  2. Using the Subaru Select Monitor, read DTC of CAN system.
 Is U0074 a current malfunction? Go to step 3  . It may be a temporary poor contact. Perform the clear memory.
3 CHECK CAN COMMUNICATION CIRCUIT. 
Check CAN communication circuit. < Ref. to PROCEDURE , CAN Communication Circuit Check. >		 Is CAN communication circuit faulty? Repair the faulty portion, following the diagnosis procedure. Go to step 4  .
4 CHECK DTC. 
  1. Perform the inspection using the DTC check sheet. < Ref. to CHECK USING THE DTC CHECK SHEET , LIST, List of Diagnostic Trouble Code (DTC). >
  2. Using the Subaru Select Monitor, read DTC of CAN system.
 Is U0074 a current malfunction? Go to step 5  . System is normal.
5 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 combination meter, 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 U0074 is not detected as current malfunction? Replace the control module. Repeat 1) to 4) in step 3 until U0074 is not detected.
RENDER: 1.0x

NO RELATED

Recommended Tools & Savings

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

Affiliate disclosure: We may earn a commission at no extra cost to you.

Shop Manual-Ready ToolsFree Quote CheckQuote Shield Pro

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.