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.
Inspection Mode 8
| DTC | Description and trouble part | Note |
|---|---|---|
| U0101 | LOST COMMUNICATION WITH TCM | BIU detects DTC only when [MT/AT Setting] is [AT]. |
| U0128 | Lost Communication With Park Brake Control Module | BIU detects DTC only when [EPB setting] is [Exist]. |
| U0164 | LOST COMMUNICATION WITH HVAC CONTROL MODULE | BIU detects DTC only when [Auto A/C Setting] is [Exist]. |
| U0169 | LOST COMMUNICATION WITH SUNROOF CONTROL MODULE | BIU detects DTC only when [Sunroof setting] is [Exist]. (Except for hybrid model) |
| U0402 | INVALID DATA RECEIVED FROM TCM | BIU detects DTC only when [MT/AT Setting] is [AT]. |
| U0417 | Invalid Data Received From Park Brake Control Module | BIU detects DTC only when [EPB setting] is [Exist]. |
| U0424 | INVALID DATA RECEIVED FROM HVAC CONTROL MODULE | BIU detects DTC only when [Auto A/C ECU Setting] is [Exist]. |
| U1235 | LOST COMMUNICATION WITH EyeSight | BIU detects DTC only when [High Beam Assist Function Setting (mirror/EyeSight)] is [EyeSight HBA]. |
| U1433 | INVALID DATA RECEIVED FROM EyeSight | BIU detects DTC only when [High Beam Assist Function Setting (mirror/EyeSight)] is [EyeSight HBA]. |
| U1673 | LIN COMMUNICATION BUS ERROR BODY CONTROL MODULE | BIU detects DTC only when [Sunroof setting] is [Exist]. (Except for hybrid model) |
Diagnostic procedure:
- Using the Subaru Select Monitor, perform the clear memory of [Body Control]. Ref. to COMMON (DIAG)>CLEAR MEMORY .
- Using the Subaru Select Monitor, read the DTC of [Body Control] to check that there is no DTC displayed. Ref. to BODY CONTROL (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 .
- Confirm that [Customize] items of [Body Control] correspond to the vehicle. Ref. to BODY CONTROL (DIAGNOSTICS)>CUSTOMIZE .
- Turn the ignition switch OFF → ON, and wait for 10 seconds or more.
- Using the Subaru Select Monitor, read the DTC of [Body Control] to check that there is no DTC displayed. Ref. to BODY CONTROL (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .
If the DTC is displayed on the screen, the trouble is still present. Perform the diagnosis for the displayed DTCs.
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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.