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.
2018 Subaru Crosstrek Base, Automatic CVT TransFACTORY OEM SERVICE PROCEDURE
Keyless Access Control Module
KEYLESS ACCESS CONTROL MODULE DIAGNOSTIC TROUBLE CODE IDENTIFICATION
| Code | Description & trouble part | Reference |
|---|---|---|
| B2271 | IGN RELAY CONTROL CIRCUIT | Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2271 IGN RELAY CONTROL CIRCUIT . |
| B2274 | ACC RELAY CONTROL CIRCUIT | Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2274 ACC RELAY CONTROL CIRCUIT . |
| B2275 | ENGINE START REQUEST CONTROL CIRCUIT | Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2275 ENGINE START REQUEST CONTROL CIRCUIT . |
| B2276 | ACC RELAY OFF SIGNAL | Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2276 ACC RELAY OFF SIGNAL . |
| B2277 | KEYLESS ACCESS CONTROL MODULE (WATER DETECTION) | Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2277 SUBMERGING CIRCUIT . |
| B227B | PUSH ENGINE START SWITCH INPUT PERFORMANCE | Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B227B PUSH ENGINE START SWITCH INPUT PERFORMANCE . |
| B227C | P RANGE SIGNAL PERFORMANCE | Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B227C P RANGE SIGNAL PERFORMANCE . |
| B2282 | VEHICLE SPEED SIGNAL CORRELATION | Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2282 VEHICLE SPEED SIGNAL CORRELATION . |
| B2283 | VEHICLE SPEED SENSOR | Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2283 VEHICLE SPEED SENSOR . |
| B2284 | BRAKE SIGNAL CORRELATION | Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2284 BRAKE SIGNAL CORRELATION . |
| B2285 | STEERING LOCK POSITION SIGNAL CORRELATION | Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2285 STEERING LOCK POSITION SIGNAL CORRELATION . |
| B2286 | ENGINE SPEED SIGNAL (WITHOUT AUTO START STOP) | Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2286 ENGINE SPEED SIGNAL (WITHOUT AUTO START STOP) . |
| B228A | ENGINE SPEED SIGNAL (WITH AUTO START STOP) | Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B228A ENGINE SPEED SIGNAL (WITH AUTO START STOP) . |
| B2779 | REMOTE CONTROL ENGINE STARTER COLLATION | Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2779 REMOTE CONTROL ENGINE STARTER COLLATION . |
| B2781 | STEERING LOCK CONTROL MODULE CONTROL CIRCUIT | Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2781 STEERING LOCK CONTROL MODULE CONTROL CIRCUIT . |
| B2782 | STEERING LOCK DRIVE REQUEST SIGNAL CORRELATION | Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2782 STEERING LOCK DRIVE REQUEST SIGNAL CORRELATION . |
| B2784 | ANTENNA CIRCUIT (PUSH ENGINE SWITCH) | Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2784 ANTENNA CIRCUIT (PUSH ENGINE SWITCH) . |
| B2785 | LIN COMMUNICATION | Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2785 LIN COMMUNICATION . |
| B2786 | STEERING LOCK CONTROL MODULE COMMUNICATION | Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2786 STEERING LOCK CONTROL MODULE COMMUNICATION . |
| B2788 | IGN SIGNAL CORRELATION (STEERING LOCK CONTROL MODULE) | Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2788 IGN SIGNAL CORRELATION (STEERING LOCK CONTROL MODULE) . |
| B2789 | ID CODE BOX COMMUNICATION | Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2789 ID CODE BOX COMMUNICATION . |
| B278A | PUSH ENGINE SWITCH POWER SUPPLY CIRCUIT | Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B278A PUSH ENGINE SWITCH POWER SUPPLY CIRCUIT . |
| B278B | CAN CONTROL MODULE STUCK | Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B278B CAN CONTROL MODULE STUCK . |
| B278D | ID CODE BOX JUDGMENT CIRCUIT | Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B278D ID CODE BOX JUDGMENT CIRCUIT . |
| B2790 | ID CODE BOX CIRCUIT | Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2790 ID CODE BOX CIRCUIT . |
| B2793 | BACKUP POWER | Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2793 BACKUP POWER . |
| B27A1 | DRIVER SIDE EXTERNAL ANTENNA OPEN | Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B27A1 DRIVER SIDE EXTERNAL ANTENNA OPEN . |
| B27A2 | PASSENGER SIDE EXTERNAL ANTENNA OPEN | Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B27A2 PASSENGER SIDE EXTERNAL ANTENNA OPEN . |
| B27A5 | FRONT INTERNAL ANTENNA OPEN | Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B27A5 FRONT INTERNAL ANTENNA OPEN . |
| B27A6 | REAR INTERNAL ANTENNA OPEN | Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B27A6 REAR INTERNAL ANTENNA OPEN . |
| B27A7 | TRUNK/REAR GATE INTERNAL ANTENNA OPEN | Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B27A7 TRUNK/REAR GATE INTERNAL ANTENNA OPEN . |
| B27A8 | TRUNK/REAR GATE EXTERNAL ANTENNA OPEN | Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B27A8 TRUNK/REAR GATE EXTERNAL ANTENNA OPEN . |
| U0074 | CONTROL MODULE COMMUNICATION BUS "BODY-CAN" OFF | Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0074 CONTROL MODULE COMMUNICATION BUS "BODY-CAN" OFF . |
| U0100 | LOST COMMUNICATION WITH ECM/PCM "A" | Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0100 LOST COMMUNICATION WITH ECM/PCM "A" . |
| U0101 | LOST COMMUNICATION WITH TCM | Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0101 LOST COMMUNICATION WITH TCM . |
| U0122 | LOST COMMUNICATION WITH VEHICLE DYNAMICS CONTROL MODULE | Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0122 LOST COMMUNICATION WITH VEHICLE DYNAMICS CONTROL MODULE . |
| U0155 | LOST COMMUNICATION WITH INSTRUMENT PANEL CLUSTER (IPC) CONTROL MODULE | Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0155 LOST COMMUNICATION WITH INSTRUMENT PANEL CLUSTER (IPC) CONTROL MODULE . |
| U0401 | INVALID DATA RECEIVED FROM ECM/PCM "A" | Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0401 INVALID DATA RECEIVED FROM ECM/PCM "A" . |
| U0423 | INVALID DATA RECEIVED FROM INSTRUMENT PANEL CLUSTER CONTROL MODULE | Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0423 INVALID DATA RECEIVED FROM INSTRUMENT PANEL CLUSTER CONTROL MODULE . |
| U1120 | LOST COMMUNICATION WITH AUTOSTART STOP CONTROL MODULE | Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U1120 LOST COMMUNICATION WITH AUTOSTART STOP CONTROL MODULE . |
| U1140 | LOST COMMUNICATION WITH BODY CONTROL MODULE BODY-CAN | Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U1140 LOST COMMUNICATION WITH BODY CONTROL MODULE BODY-CAN . |
| U1422 | INVALID DATA RECEIVED FROM BODY CONTROL MODULE BODY-CAN | Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U1422 INVALID DATA RECEIVED FROM BODY CONTROL MODULE BODY-CAN . |
Factory Service Tools
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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.