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 1
2016 Subaru Legacy 2.5iSECTION Inspection Mode 1
| DTC | Item | Note |
|---|---|---|
| U0073 | CAN FAILURE, BUS 'OFF' DETECTION | - |
| U0100 | LOST COMMUNICATION WITH ECM/PCM "A" | - |
| U0101 | LOST COMMUNICATION WITH TCM | - |
| U0122 | LOST COMMUNICATION WITH VEHICLE DYNAMICS CONTROL MODULE | - |
| U0140 | LOST COMMUNICATION WITH BODY CONTROL MODULE | - |
| U0155 | LOST COMMUNICATION WITH INSTRUMENT PANEL CLUSTER (IPC) CONTROL MODULE | - |
| U0401 | INVALID DATA RECEIVED FROM ECM/PCM "A" | - |
| U0422 | INVALID DATA RECEIVED FROM BODY CONTROL MODULE | - |
| B1571 | REFERENCE CODE INCOMPATIBILITY (IMMOBILIZER CONTROL MODULE TO ECM) | - |
| B1572 | IMM CIRCUIT EXCEPT ANTENNA CIRCUIT | - |
| B1576 | EGI CONTROL MODULE EEPROM | - |
| B1577 | IMM CONTROL MODULE EEPROM | - |
| B2271 | IGN RELAY CONTROL CIRCUIT | - |
| B2274 | ACC RELAY CONTROL CIRCUIT | - |
| B2275 | ENGINE START REQUEST CONTROL CIRCUIT | - |
| B2276 | ACC RELAY OFF SIGNAL | - |
| B2277 | SUBMERGING CIRCUIT | - |
| B2285 | STEERING LOCK POSITION SIGNAL CORRELATION | - |
| B2286 | ENGINE SPEED SIGNAL (WITHOUT 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 | - |
| B278D | ID CODE BOX JUDGMENT CIRCUIT | - |
| B2793 | BACK UP POWER | - |
Diagnostic procedure:
- Prepare for the inspection mode. < Ref. to PREPARATION FOR THE INSPECTION MODE , PROCEDURE, Inspection Mode. >
- Start the engine, and let it idle for 40 seconds or more.
- Read the DTC and check that the DTC is not displayed. < Ref. to
READ DIAGNOSTIC TROUBLE CODE (DTC) . >NOTE: If the DTC is displayed on the screen, the trouble is still present. Perform the diagnosis according to DTC.
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.