LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Subaru >> 2024 >> Ascent Base >> Repair and Diagnosis (Single Page) >> General Information >> DTC Index >> Keyless Access (W/Push Button Start) DTCS >> Keyless Access Control Module
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Keyless Access Control Module

KEYLESS ACCESS CONTROL MODULE DIAGNOSTIC TROUBLE CODE (DTC) 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) .
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 .
B2788 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 .
U0230 LOST COMMUNICATION WITH REAR GATE MODULE (1)
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" .
U0416 INVALID DATA RECEIVED FROM VEHICLE DYNAMICS CONTROL MODULE Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC U0416 INVALID DATA RECEIVED FROM VEHICLE DYNAMICS CONTROL MODULE .
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 .
U0531 I VALID DATA RECEIVED FROM REAR GATE MODULE (1)
U1120 LOST COMMUNICATION WITH AUTOSTART STOP CONTROL MODULE (1)
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 .
U1198 Lost Communication With Telematics System Ref. to KEYLESS ACCESS WITH PUSH BUTTON START (DIAGNOSTICS)>DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)>DTC U1198 LOST COMMUNICATION WITH TELEMATICS SYSTEM .
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 .
U1602 LOST COMMUNICATION WITH HANDS FREE SENSOR (1)
U1670 LIN COMMUNICATION BUS 2 ERROR KEYLESS ACCESS WITH PUSH BUTTON START (1)
(1) Not displayed on this vehicle due to the equipment specifications.