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Inspection Mode 1

WARNING: This page is about a different car, the 2022 Subaru WRX. However, it is still accessible from the selected car via links, so may be relevant.
DTC Description & trouble part Note
U0074 CONTROL MODULE COMMUNICATION BUS "BODY-CAN" OFF -
U0100 LOST COMMUNICATION WITH ECM/PCM "A" -
U0101 LOST COMMUNICATION WITH TCM -
U0122 LOST COMMUNICATION WITH VEHICLE DYNAMICS CONTROL MODULE -
U0155 LOST COMMUNICATION WITH INSTRUMENT PANEL CLUSTER (IPC) CONTROL MODULE -
U0401 INVALID DATA RECEIVED FROM ECM/PCM "A" -
U0416 INVALID DATA RECEIVED FROM VEHICLE DYNAMICS CONTROL MODULE -
U0423 INVALID DATA RECEIVED FROM INSTRUMENT PANEL CLUSTER CONTROL MODULE -
U1120 LOST COMMUNICATION WITH AUTOSTART STOP CONTROL MODULE -
U1140 LOST COMMUNICATION WITH BODY CONTROL MODULE BODY-CAN -
U1198 LOST COMMUNICATION WITH TELEMATICS SYSTEM -
U1422 INVALID DATA RECEIVED FROM BODY CONTROL MODULE BODY-CAN -
B2271 IGN RELAY CONTROL CIRCUIT -
B2274 ACC RELAY CONTROL CIRCUIT -
B2275 ENGINE START REQUEST CONTROL CIRCUIT -
B2276 ACC RELAY OFF SIGNAL -
B2277 KEYLESS ACCESS CONTROL MODULE (WATER DETECTION) -
B227B PUSH ENGINE START SWITCH INPUT PERFORMANCE -
B227C P RANGE SIGNAL PERFORMANCE -
B227D KEYLESS ACCESS WITH PUSH BUTTON START -
B2285 STEERING LOCK POSITION SIGNAL CORRELATION -
B2286 ENGINE SPEED SIGNAL (WITHOUT AUTO START STOP) -
B228A ENGINE SPEED SIGNAL (WITH AUTO START STOP) -
B2781 STEERING LOCK CONTROL MODULE CONTROL CIRCUIT -
B2782 STEERING LOCK DRIVE REQUEST SIGNAL CORRELATION -
B2785 LIN COMMUNICATION -
B2786 STEERING LOCK CONTROL MODULE COMMUNICATION -
B2788 IGN SIGNAL CORRELATION (STEERING LOCK CONTROL MODULE) -
B2789 ID CODE BOX COMMUNICATION -
B278B CAN CONTROL MODULE STUCK -
B278D ID CODE BOX JUDGMENT CIRCUIT -
B2793 BACKUP POWER -

Diagnostic procedure: 

  1. Check that the battery voltage is 12 V or more and fuel remains approx. half [20 - 40 L (5.3 - 10.6 US gal, 4.4 - 8.8 Imp gal)].
  2. Using the Subaru Select Monitor, perform the clear memory of [Keyless Access with Push Button Start]. Ref. to COMMON (DIAGNOSTICS)>CLEAR MEMORY
  3. Using the Subaru Select Monitor, read the DTC of [Keyless Access with Push Button Start] to check that there is no DTC displayed. Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) 
    NOTE:

    If the DTC is displayed on the screen, the trouble is still present. Perform the diagnosis for the displayed DTCs. After solving the DTC, repeat from step   1 . 

  4. Start the engine, and let it idle for 40 seconds or more.
  5. Using the Subaru Select Monitor, read the DTC of [Keyless Access with Push Button Start] to check that there is no DTC displayed. Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) 
    NOTE:

    If the DTC is displayed on the screen, the trouble is still present. Perform the diagnosis for the displayed DTCs. After solving the DTC, repeat from step   1 .