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HOMESERVICE MANUALSSUBARU2014IMPREZA SPORT LIMITEDREPAIR AND DIAGNOSISBODY & FRAMEDOOR LOCKSKEYLESS ACCESS WITH PUSH BUTTON START SYSTEM (DIAGNOSTICS)LIST OF DIAGNOSTIC TROUBLE CODE (DTC)LIST
2014 Subaru Impreza Sport Limited
List of Diagnostic Trouble Code (DTC): List
2014 Subaru Impreza Sport LimitedSECTION List
- Keyless access system
DTC Item Content of diagnosis Note U0073 Control Module Communication Bus Off Detected when CAN line abnormality is detected. < Ref. to DTC U0073 CONTROL MODULE COMMUNICATION BUS OFF , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> U0100 Lost Communication With ECM/PCM "A" Detected when CAN data from the engine control module (ECM) does not arrive. < Ref. to DTC U0100 LOST COMMUNICATION WITH ECM/PCM "A" , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> U0101 Lost Communication With TCM Detected when CAN data from TCM does not arrive. < Ref. to DTC U0101 LOST COMMUNICATION WITH TCM , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> U0122 Lost Communication With Vehicle Dynamics Control Module Detected when CAN data from VDC does not arrive. < Ref. to DTC U0122 LOST COMMUNICATION WITH VEHICLE DYNAMICS CONTROL MODULE , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> U0140 Lost Communication With Body Control Module Detected when CAN data from BIU does not arrive. < Ref. to DTC U0140 LOST COMMUNICATION WITH BODY CONTROL MODULE , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> U0155 Lost Communication With Instrument Panel Cluster (IPC) Control Module Detected when CAN data from meter does not arrive. < Ref. to DTC U0155 LOST COMMUNICATION WITH INSTRUMENT PANEL CLUSTER (IPC) CONTROL MODULE , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> U0401 Invalid Data Received From ECM/PCM "A" Detected when there is malfunction in CAN data from the engine control module (ECM). < Ref. to DTC U0401 INVALID DATA RECEIVED FROM ECM/PCM "A" , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> U0422 Invalid Data Received From Body Control Module Detected when CAN data from BIU is abnormal. < Ref. to DTC U0422 INVALID DATA RECEIVED FROM BODY CONTROL MODULE , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> U1120 Lost Communication With Autostart Stop Control Module Detected when CAN data from ISS unit does not arrive. < Ref. to DTC U1120 LOST COMMUNICATION WITH AUTOSTART STOP CONTROL MODULE , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> B1242 Wireless Tuner Abnormal When short circuit occurs in harness between keyless access CM and receiver. < Ref. to DTC B1242 WIRELESS TUNER ABNORMAL , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> B2271 IGN Fuse Blown or IGN Circuit Abnormal - When malfunction is detected in IG1 and IG2 drive circuits in the keyless access CM.
- When malfunction is detected in IG hold circuit in the keyless access CM.
< Ref. to DTC B2271 IGN FUSE BLOWN OR IGN CIRCUIT ABNORMAL , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> B2274 ACC Monitor When malfunction is detected in ACC relay drive circuit in the keyless access CM or external circuit. < Ref. to DTC B2274 ACC MONITOR , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> B2275 STSW Circuit Abnormal - When malfunction is detected in engine start permission signal output circuit in the keyless access CM.
- When malfunction is detected in external engine start permission signal circuit.
< Ref. to DTC B2275 STSW CIRCUIT ABNORMAL , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> B2276 ACCR Signal Abnormal When input error occurs in accessory relay cut input signal of keyless access CM. < Ref. to DTC B2276 ACCR SIGNAL ABNORMAL , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> B2277 Submerging Circuit Abnormal When the water-submersion detection circuit integrated into the keyless access CM detects the water submersion. < Ref. to DTC B2277 SUBMERGING CIRCUIT ABNORMAL , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> B2282 Vehicle Speed Signal Abnormal When the vehicle speed signal transmitted from the combination meter via solid line and the vehicle speed signal transmitted via CAN communication line do not match.) < Ref. to DTC B2282 VEHICLE SPEED SIGNAL ABNORMAL , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> B2283 Vehicle Speed Sensor Fault Detection Either of the following malfunctions is detected. (Vehicle speed sensor failure is detected.) - Vehicle speed signal failure detection 1: Excessive deceleration detection
- Vehicle speed signal failure detection 2: Engine speed interlock detection
< Ref. to DTC B2283 VEHICLE SPEED SENSOR FAULT DETECTION , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> B2284 Brake Signal (Cable-Information Does Not Match to Bean-Information) When the brake signal transmitted via solid line and the brake signal transmitted via CAN communication line do not match. < Ref. to DTC B2284 BRAKE SIGNAL (CABLE-INFORMATION DOES NOT MATCH TO BEAN-INFORMATION) , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> B2285 Steering Lock Position Signal Abnormal When the steering lock position signal transmitted from the steering lock CM via solid line and the steering lock position signal transmitted via LIN communication system do not match. < Ref. to DTC B2285 STEERING LOCK POSITION SIGNAL ABNORMAL , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> B2286 Driving Possible Signal Abnormal When the engine speed signal transmitted from the ECM via solid line and the engine speed signal transmitted via CAN communication line do not match. < Ref. to DTC B2286 DRIVING POSSIBLE SIGNAL ABNORMAL , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> B228A Sub-Travel Possible Signal Abnormal When the engine speed signal transmitted from the ECM via solid line and the engine speed signal transmitted via CAN communication line do not match. < Ref. to DTC B228A SUB-TRAVEL POSSIBLE SIGNAL ABNORMAL , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> B2779 Remote Control Engine Starter Communication Collation NG When the keyless access CM does not respond to engine start even when the remote control engine starter is ON, or when there is a code mismatch. < Ref. to DTC B2779 REMOTE CONTROL ENGINE STARTER COMMUNICATION COLLATION NG , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> B2781 Steering Lock ECU Open/Short - When malfunction is detected in lock/unlock position detection sensor.
- When the open or short circuit in the steering lock motor drive circuit is detected.
< Ref. to DTC B2781 STEERING LOCK ECU OPEN/SHORT , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> B2782 Steering Lock Power Supply Circuit Abnormal (Smart ECU-Side Abnormal) When the open or short circuit in the steering lock motor power supply circuit is detected. < Ref. to DTC B2782 STEERING LOCK POWER SUPPLY CIRCUIT ABNORMAL (SMART ECU-SIDE ABNORMAL) , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> B2784 Antenna Coil Fault When open or short circuit occurs in the antenna coil. < Ref. to DTC B2784 ANTENNA COIL FAULT , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> B2785 LIN Communication Error When the keyless access CM detects the collation system LIN bus communication error three times in a row. < Ref. to DTC B2785 LIN COMMUNICATION ERROR , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> B2786 No Response From Steering Lock ECU When communication between keyless access CM and steering lock CM is interrupted for a set amount of time. < Ref. to DTC B2786 NO RESPONSE FROM STEERING LOCK ECU , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> B2788 IGN1 Input Abnormal When mismatch occurs in the IG1 input of the steering lock CM between LIN communication line input and solid line input. < Ref. to DTC B2788 IGN1 INPUT ABNORMAL , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> B2789 ID Code Box No Response - When communication between keyless access CM and ID code box is interrupted for a set amount of time.
- Open or short circuit in the wiring harness between keyless access CM and ID code box
< Ref. to DTC B2789 ID CODE BOX NO RESPONSE , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> B278A Abnormal Immobilizer Power Supply When the power supply circuit of the push button ignition switch is shorted to ground. < Ref. to DTC B278A ABNORMAL IMMOBILIZER POWER SUPPLY , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> B278D ID Code Box Recognition Judgment Abnormal - When ID code box ON input is detected while the ID code box setting is set to OFF.
- When ID code box LIN signal is received while the ID code box setting is set to OFF.
< Ref. to DTC B278D ID CODE BOX RECOGNITION JUDGMENT ABNORMAL , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> B2790 ID Code Box Abnormal (EEPROM Abnormal) An error has occurred inside the ID code box. < Ref. to DTC B2790 ID CODE BOX ABNORMAL (EEPROM ABNORMAL) , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> B27A1 Driver Side External Antenna Output Stage Open When open circuit occurs in the harness between keyless access CM and driver's side front door outer handle. < Ref. to DTC B27A1 DRIVER SIDE EXTERNAL ANTENNA OUTPUT STAGE OPEN , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> B27A2 Passenger Side External Antenna Output Stage Open When open circuit occurs in the harness between keyless access CM and passenger's side front door outer handle. < Ref. to DTC B27A2 PASSENGER SIDE EXTERNAL ANTENNA OUTPUT STAGE OPEN , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> B27A5 Front Internal Antenna Output Stage Open When open circuit occurs in the harness between keyless access CM and front interior antenna. < Ref. to DTC B27A5 FRONT INTERNAL ANTENNA OUTPUT STAGE OPEN , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> B27A6 Rear Internal Antenna Output Stage Open When open circuit occurs in the harness between keyless access CM and rear interior antenna. < Ref. to DTC B27A6 REAR INTERNAL ANTENNA OUTPUT STAGE OPEN , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> B27A7 Trunk/Rear Gate Internal Antenna Output Stage Open When open circuit occurs in the harness between keyless access CM and rear interior antenna. < Ref. to DTC B27A7 TRUNK/REAR GATE INTERNAL ANTENNA OUTPUT STAGE OPEN , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> B27A8 Trunk/Rear Gate External Antenna Output Stage Open When open circuit occurs in the harness between keyless access CM and rear exterior antenna. < Ref. to DTC B27A8 TRUNK/REAR GATE EXTERNAL ANTENNA OUTPUT STAGE OPEN , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> - Immobilizer (ECM)
DTC Item Content of diagnosis Note B1571 Reference Code Incompatibility Reference code incompatibility between keyless access CM (models without ID code box) or ID code box (models with ID code box) and ECM < Ref. to DTC B1571 REFERENCE CODE INCOMPATIBILITY , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> B1572 IMM Circuit Failure (Except Antenna Circuit) Communication error between keyless access CM (models without ID code box) or ID code box (models with ID code box) and ECM < Ref. to DTC B1572 IMM CIRCUIT FAILURE (EXCEPT ANTENNA CIRCUIT) , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> B1576 EGI Control Module EEPROM ECM malfunctioning < Ref. to DTC B1576 EGI CONTROL MODULE EEPROM , Diagnostic Procedure with Diagnostic Trouble Code (DTC).> B1577 IMM Control Module EEPROM Malfunction in keyless access CM (models without ID code box) or ID code box (models with ID code box) < Ref. to DTC B1577 IMM CONTROL MODULE EEPROM , 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.