LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Subaru >> 2011 >> Forester X, Automatic >> Repair and Diagnosis >> Quick Lookups >> DTC Index >> LAN Communication System DTCS
April 5, 2026: LEMON Manuals is launched! Read the announcement.

LAN Communication System DTCS

LAN COMMUNICATION SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) LIST

DTC Item Content of diagnosis Note
B1100 Integ. Unit System Error Memory read out error in body integrated unit < Ref. to DTC B1100 INTEG. UNIT SYSTEM ERROR , Diagnostic Procedure with Diagnostic Trouble Code (DTC). >
B1101 BATT p/supply malfunction cont.
  • Open or short in battery power supply control circuit
  • Voltage malfunction caused by poor contact
< Ref. to DTC B1101 BATT P/SUPPLY MALFUNCTION CONT , Diagnostic Procedure with Diagnostic Trouble Code (DTC). >
B1102 BATT p/supply malfunction backup
  • Battery power supply backup circuit is open or shorted.
  • Voltage malfunction caused by poor contact
< Ref. to DTC B1102 BATT P/SUPPLY MALFUNCTION BACKUP , Diagnostic Procedure with Diagnostic Trouble Code (DTC). >
B1103 Ignition power failure
  • IGN power supply circuit is open or shorted.
  • Voltage malfunction caused by poor contact
< Ref. to DTC B1103 IGNITION POWER FAILURE , Diagnostic Procedure with Diagnostic Trouble Code (DTC). >
B1104 ACC power failure
  • ACC power supply circuit is open or shorted.
  • Voltage malfunction caused by poor contact
< Ref. to DTC B1104 ACC POWER FAILURE , Diagnostic Procedure with Diagnostic Trouble Code (DTC). >
B1105 Key interlock circuit abnormal GND-output short of key interlock circuit < Ref. to DTC B1105 KEY INTERLOCK CIRCUIT ABNORMAL , Diagnostic Procedure with Diagnostic Trouble Code (DTC). >
B1106 shift lock circuit Failure 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). >
U1201 CAN-HS counter abnormal Communication is unstable because of high speed CAN communication error. < Ref. to DTC U1201 CAN-HS COUNTER ABNORMAL , Diagnostic Procedure with Diagnostic Trouble Code (DTC). >
U1202 CAN-HS bus off Integrated unit communication is shut down because of high speed CAN communication error. < Ref. to DTC U1202 CAN-HS BUS OFF , Diagnostic Procedure with Diagnostic Trouble Code (DTC). >
U1211 CAN-HS ECM data abnormal Received error data from ECM. < Ref. to DTC U1211 CAN-HS ECM DATA ABNORMAL , Diagnostic Procedure with Diagnostic Trouble Code (DTC). >
U1212 CAN-HS TCM data abnormal Received error data from TCM. < Ref. to DTC U1212 CAN-HS TCM DATA ABNORMAL , Diagnostic Procedure with Diagnostic Trouble Code (DTC). >
U1213 CAN-HS VDC/ABS data abnormal Received error data from VDC/ABS module. < Ref. to DTC U1213 CAN-HS VDC/ABS DATA ABNORMAL , Diagnostic Procedure with Diagnostic Trouble Code (DTC). >
U1221 CAN-HS ECM no-receive data Not received data from ECM. < Ref. to DTC U1221 CAN-HS ECM NO-RECEIVE DATA , Diagnostic Procedure with Diagnostic Trouble Code (DTC). >
U1222 CAN-HS TCM no-receive Data Not received data from TCM. < Ref. to DTC U1222 CAN-HS TCM NO-RECEIVE DATA , Diagnostic Procedure with Diagnostic Trouble Code (DTC). >
U1223 CAN-HS VDC/ABS no-receive data Not received data from VDC/ABS CM. < Ref. to DTC U1223 CAN-HS VDC/ABS NO-RECEIVE DATA , Diagnostic Procedure with Diagnostic Trouble Code (DTC). >
U1300 CAN-LS malfunction CAN-LS circuit is open or shorted. < Ref. to DTC U1300 CAN-LS MALFUNCTION , Diagnostic Procedure with Diagnostic Trouble Code (DTC). >
U1301 CAN-LS counter abnormal Communication is unstable because of low speed CAN communication error. < Ref. to DTC U1301 CAN-LS COUNTER ABNORMAL , Diagnostic Procedure with Diagnostic Trouble Code (DTC). >
U1302 CAN-LS bus off Integrated unit communication is shut down because of low speed CAN communication error. < Ref. to DTC U1302 CAN-LS BUS OFF , Diagnostic Procedure with Diagnostic Trouble Code (DTC). >
U1311 CAN-LS meter unit data abnormal Received error data from meter. < Ref. to DTC U1311 CAN-LS METER UNIT DATA ABNORMAL , Diagnostic Procedure with Diagnostic Trouble Code (DTC). >
U1321 CAN-LS meter no-receive data Not received data from meter. < Ref. to DTC U1321 CAN-LS METER NO-RECEIVE DATA , Diagnostic Procedure with Diagnostic Trouble Code (DTC). >
B1401 M Collation NG Malfunction related immobilizer < Ref. to DTC B1401 M COLLATION NG , Diagnostic Procedure with Diagnostic Trouble Code (DTC). >
B1402 Immobilizer Key Collation NG Malfunction related immobilizer < Ref. to DTC B1402 IMMOBILIZER KEY COLLATION NG , Diagnostic Procedure with Diagnostic Trouble Code (DTC). >
B1403 E/G request NG Malfunction related immobilizer < Ref. to DTC B1403 E/G REQUEST NG , Diagnostic Procedure with Diagnostic Trouble Code (DTC). >
B1500 Keyless UART com. Malfunction Open or short circuit in keyless UART circuit < Ref. to DTC B1500 KEYLESS UART COM. MALFUNCTION , Diagnostic Procedure with Diagnostic Trouble Code (DTC). >