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.
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HOMESERVICE MANUALSSUBARU2014FORESTER 2.5I PREMIUM, ENG CD FB25BA, STANDARD TRANSREPAIR AND DIAGNOSISGENERAL INFORMATIONDTC INDEXLAN COMMUNICATION SYSTEM DTCS
2014 Subaru Forester 2.5i Premium, Eng CD FB25BA, Standard Trans
LAN Communication System DTCS
2014 Subaru Forester 2.5i Premium, Eng CD FB25BA, Standard TransSECTION LAN Communication System DTCS
LAN SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) LIST
| DTC | Description |
|---|---|
| DTC U1201 | CAN-HS COUNTER ABNORMAL |
| DTC U0073 | CONTROL MODULE COMMUNICATION BUS "A" OFF |
| DTC U0401 | INVALID DATA RECEIVED FROM ECM/PCM "A" |
| DTC U0402 | INVALID DATA RECEIVED FROM TCM |
| DTC U0416 | INVALID DATA RECEIVED FROM VEHICLE DYNAMICS CONTROL MODULE |
| DTC U0420 | INVALID DATA RECEIVED FROM POWER STEERING CONTROL MODULE |
| DTC U0422 | INVALID DATA RECEIVED FROM BODY CONTROL MODULE |
| DTC U0423 | INVALID DATA RECEIVED FROM INSTRUMENT PANEL CLUSTER CONTROL MODULE |
| DTC U0424 | INVALID DATA RECEIVED FROM HVAC CONTROL MODULE |
| DTC U0427 | INVALID DATA RECEIVED FROM VEHICLE SECURITY CONTROL MODULE |
| DTC U0428 | INVALID DATA RECEIVED FROM STEERING ANGLE SENSOR MODULE |
| DTC U0452 | INVALID DATA RECEIVED FROM RESTRAINTS CONTROL MODULE |
| DTC U0513 | INVALID DATA RECEIVED FROM YAW RATE SENSOR MODULE |
| DTC U1433 | INVALID DATA RECEIVED FROM EyeSight |
| DTC U0100 | LOST COMMUNICATION WITH ECM/PCM "A" |
| DTC U0101 | LOST COMMUNICATION WITH TCM |
| DTC U0122 | LOST COMMUNICATION WITH VEHICLE DYNAMICS CONTROL MODULE |
| DTC U0123 | LOST COMMUNICATION WITH YAW RATE SENSOR MODULE |
| DTC U0126 | LOST COMMUNICATION WITH STEERING ANGLE SENSOR MODULE |
| DTC U0131 | LOST COMMUNICATION WITH POWER STEERING CONTROL MODULE |
| DTC U0140 | LOST COMMUNICATION WITH BODY CONTROL MODULE |
| DTC U0151 | LOST COMMUNICATION WITH RESTRAINTS CONTROL MODULE |
| DTC U0155 | LOST COMMUNICATION WITH INSTRUMENT PANEL CLUSTER (IPC) CONTROL MODULE |
| DTC U0164 | LOST COMMUNICATION WITH HVAC CONTROL MODULE |
| DTC U0327 | SOFTWARE INCOMPATIBILITY WITH VEHICLE SECURITY CONTROL MODULE |
| DTC U1235 | LOST COMMUNICATION WITH EyeSight |
| DTC U1602 | LOST COMMUNICATION WITH POWER REAR GATE CONTROL MODULE |
LAN COMMUNICATION SYSTEM
| DTC | Description | Reference |
|---|---|---|
| B1100 | Memory read out error in body integrated unit | < Ref. to DTC B1100: INTEG. UNIT SYSTEM ERROR , Diagnostic Procedure with Diagnostic Trouble Code (DTC). > |
| B1101 |
|
< Ref. to DTC B1101: BATT P/SUPPLY MALFUNCTION CONT , Diagnostic Procedure with Diagnostic Trouble Code (DTC). > |
| B1102 |
|
< Ref. to DTC B1102: BATT P/SUPPLY MALFUNCTION BACKUP , Diagnostic Procedure with Diagnostic Trouble Code (DTC). > |
| B1103 |
|
< Ref. to DTC B1103: IGNITION POWER FAILURE , Diagnostic Procedure with Diagnostic Trouble Code (DTC). > |
| B1104 |
|
< Ref. to DTC B1104: ACC POWER FAILURE , Diagnostic Procedure with Diagnostic Trouble Code (DTC). > |
| B1105 | GND-output short of key interlock circuit | < Ref. to DTC B1105: KEY INTERLOCK CIRCUIT ABNORMAL , Diagnostic Procedure with Diagnostic Trouble Code (DTC). > |
| B1106 | Open or power supply-output short, GND-output short in shift lock circuit | < Ref. to DTC B1106: SHIFT LOCK CIRCUIT FAILURE , Diagnostic Procedure with Diagnostic Trouble Code (DTC). > |
| B1401 | Malfunction related immobilizer | < Ref. to DTC B1401: M COLLATION NG , Diagnostic Procedure with Diagnostic Trouble Code (DTC). > |
| B1402 | Malfunction related immobilizer | < Ref. to DTC B1402: IMMOBILIZER KEY COLLATION NG , Diagnostic Procedure with Diagnostic Trouble Code (DTC). > |
| B1500 | Open or short circuit in keyless UART circuit | < Ref. to DTC B1500: KEYLESS UART COM. MALFUNCTION , Diagnostic Procedure with Diagnostic Trouble Code (DTC). > |
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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.