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.
2022 Subaru Ascent BaseFACTORY OEM SERVICE PROCEDURE
Brake Control System DTCS
BRAKE CONTROL SYSTEM DIAGNOSTIC TROUBLE CODE (DTC) IDENTIFICATION
| Code | Reference |
|---|---|
| C1211 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1211 FRONT RIGHT ABS SENSOR CIRCUIT . |
| C1212 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1212 FRONT RIGHT ABS SENSOR SIGNAL . |
| C1221 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1221 FRONT LEFT ABS SENSOR CIRCUIT . |
| C1222 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1222 FRONT LEFT ABS SENSOR SIGNAL . |
| C1231 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1231 REAR RIGHT ABS SENSOR CIRCUIT . |
| C1232 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1232 REAR RIGHT ABS SENSOR SIGNAL . |
| C1241 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1241 REAR LEFT ABS SENSOR CIRCUIT . |
| C1242 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1242 REAR LEFT ABS SENSOR SIGNAL . |
| C1311 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1311 FR HOLD VALVE . |
| C1312 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1312 FR PRESSURE REDUCING VALVE . |
| C1321 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1321 FL HOLD VALVE . |
| C1322 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1322 FL PRESSURE REDUCING VALVE . |
| C1331 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1331 RR HOLD VALVE . |
| C1332 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1332 RR PRESSURE REDUCING VALVE . |
| C1341 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1341 RL HOLD VALVE . |
| C1342 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1342 RL PRESSURE REDUCING VALVE . |
| C1351 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1351 NORMAL OPENING VALVE 1 . |
| C1352 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1352 NORMAL OPENING VALVE 2 . |
| C1361 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1361 NORMAL CLOSING VALVE 1 . |
| C1362 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1362 NORMAL CLOSING VALVE 2 . |
| C1411 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1411 ELECTRICAL CONTROL MODULE . |
| C1412 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1412 SELECTED PARAMETER . |
| C1413 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1413 POWER SUPPLY VOLTAGE . |
| C1422 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1422 VDC INTERRUPTION FOR ENGINE CONVENIENCE . |
| C1423 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1423 DIFFERENT ECU SPECIFICATIONS . |
| C1424 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1424 ECM . |
| C1431 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1431 AT . |
| C1432 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1432 DIFFERENT ECU SPECIFICATIONS . |
| C1511 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1511 VALVE RELAY . |
| C1521 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1521 MOTOR RELAY . |
| C1531 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1531 BLS OFF STUCK . |
| C1532 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1532 BLS ON STUCK . |
| C1571 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1571 BRAKE LAMP RELAY OFF STUCK . |
| C1581 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1581 BRAKE BOOST NEGATIVE PRESSURE ABNORMAL . |
| C1711 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1711 STEERING ANGLE SENSOR . |
| C1721 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1721 YAW RATE SENSOR . |
| C1732 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1732 LATERAL G SENSOR . |
| C1733 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1733 LONGITUDINAL G SENSOR . |
| C1741 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1741 PRESSURE SENSOR . |
| C1742 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1742 WHEEL CYLINDER PRESSURE SENSOR . |
| C1751 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1751 BRAKE BOOST GAUGE SENSOR . |
| C1811 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1811 SYSTEM . |
| C1821 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1821 BRAKE TEMPERATURE ABNORMAL . |
| C1831 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1831 INSUFFICIENT DECELERATION DURING DYNAMIC PARKING BRAKE OPERATION . |
| C1921 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1921 PARKING POSITION SWITCH CIRCUIT . |
| C1923 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1923 AUTO VEHICLE HOLD SWITCH CIRCUIT . |
| C1935 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1935 IGNITION SWITCH CIRCUIT . |
| C1942 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1942 POWER SUPPLY VOLTAGE . |
| C1951 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1951 ACTUATOR . |
| C1954 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1954 RH ACTUATOR . |
| C1955 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1955 LH ACTUATOR . |
| C1956 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1956 RH ACTUATOR CIRCUIT . |
| C1957 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1957 LH ACTUATOR CIRCUIT . |
| C1983 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1983 HIGH FREQUENCY OPERATION . |
| C1984 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1984 BRAKE MAINTENANCE MODE . |
| C1985 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC C1985 FORBIDDEN STATE OF DYNAMIC ACTUATOR OPERATION . |
| U0073 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0073 CONTROL MODULE COMMUNICATION BUS OFF . |
| U0100 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0100 LOST COMMUNICATION WITH ECM/PCM "A" . |
| U0101 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0101 LOST COMMUNICATION WITH TCM . |
| U0126 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0126 LOST COMMUNICATION WITH STEERING ANGLE SENSOR MODULE . |
| U0140 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0140 LOST COMMUNICATION WITH BODY CONTROL MODULE . |
| U0155 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0155 LOST COMMUNICATION WITH INSTRUMENT PANEL CLUSTER (IPC) CONTROL MODULE . |
| U0401 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0401 INVALID DATA RECEIVED FROM ECM/PCM "A" . |
| U0402 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0402 INVALID DATA RECEIVED FROM TCM . |
| U0422 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0422 INVALID DATA RECEIVED FROM BODY CONTROL MODULE . |
| U0423 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0423 INVALID DATA RECEIVED FROM INSTRUMENT PANEL CLUSTER CONTROL MODULE . |
| U0428 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0428 INVALID DATA RECEIVED FROM STEERING ANGLE SENSOR MODULE . |
| U1235 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U1235 LOST COMMUNICATION WITH EYESIGHT . |
| U1433 | Ref. to BRAKE CONTROL (DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U1433 INVALID DATA RECEIVED FROM EYESIGHT . |
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.
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