Subaru Legacy BN/BS (2015-2019) Service Manual: List of diagnostic trouble code (dtc) list

Subaru Legacy BN/BS (2015-2019) Service Manual / Tire pressure monitoring system (diagnostics) / List of diagnostic trouble code (dtc) list

DTC	Item	Note
C2021	TIRE 1 AIR PRESSURE LOW (NORMAL MODE)	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C2021 TIRE 1 AIR PRESSURE LOW (NORMAL MODE)
C2022	TIRE 2 AIR PRESSURE LOW (NORMAL MODE)	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C2022 TIRE 2 AIR PRESSURE LOW (NORMAL MODE)
C2023	TIRE 3 AIR PRESSURE LOW (NORMAL MODE)	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C2023 TIRE 3 AIR PRESSURE LOW (NORMAL MODE)
C2024	TIRE 4 AIR PRESSURE LOW (NORMAL MODE)	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C2024 TIRE 4 AIR PRESSURE LOW (NORMAL MODE)
C2121	TRANSMITTER 1 NO DATA	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C2121 TRANSMITTER 1 NO DATA
C2122	TRANSMITTER 2 NO DATA	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C2122 TRANSMITTER 2 NO DATA
C2123	TRANSMITTER 3 NO DATA	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C2123 TRANSMITTER 3 NO DATA
C2124	TRANSMITTER 4 NO DATA	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C2124 TRANSMITTER 4 NO DATA
C2221	TRANSMITTER 1 PRESSURE DATA ABNORMAL	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C2221 TRANSMITTER 1 PRESSURE DATA ABNORMAL
C2222	TRANSMITTER 2 PRESSURE DATA ABNORMAL	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C2222 TRANSMITTER 2 PRESSURE DATA ABNORMAL
C2223	TRANSMITTER 3 PRESSURE DATA ABNORMAL	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C2223 TRANSMITTER 3 PRESSURE DATA ABNORMAL
C2224	TRANSMITTER 4 PRESSURE DATA ABNORMAL	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C2224 TRANSMITTER 4 PRESSURE DATA ABNORMAL
C2321	TRANSMITTER 1 FUNCTION CODE ABNORMAL	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C2321 TRANSMITTER 1 FUNCTION CODE ABNORMAL
C2322	TRANSMITTER 2 FUNCTION CODE ABNORMAL	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C2322 TRANSMITTER 2 FUNCTION CODE ABNORMAL
C2323	TRANSMITTER 3 FUNCTION CODE ABNORMAL	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C2323 TRANSMITTER 3 FUNCTION CODE ABNORMAL
C2324	TRANSMITTER 4 FUNCTION CODE ABNORMAL	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C2324 TRANSMITTER 4 FUNCTION CODE ABNORMAL
C2421	TRANSMITTER 1 BATTERY VOLTAGE LOW	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C2421 TRANSMITTER 1 BATTERY VOLTAGE LOW
C2422	TRANSMITTER 2 BATTERY VOLTAGE LOW	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C2422 TRANSMITTER 2 BATTERY VOLTAGE LOW
C2423	TRANSMITTER 3 BATTERY VOLTAGE LOW	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C2423 TRANSMITTER 3 BATTERY VOLTAGE LOW
C2424	TRANSMITTER 4 BATTERY VOLTAGE LOW	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C2424 TRANSMITTER 4 BATTERY VOLTAGE LOW
C2521	SPEED ABNORMAL	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC C2521 SPEED ABNORMAL

Inspection mode procedure

Reproduce the malfunction occurrence condition as much as possible. Drive the vehicle at 40 km/h (25 MPH) or faster for at least ten minutes. ...

Read diagnostic trouble code (dtc) operation

1. On «Start» display, select «Diagnosis».2. On «Vehicle selection» display, input the target vehicle information and select «Confirmed».3. On «Main Menu» display, select «Each System».4. ...

Other materials:

Inspection
1. Visually check the cam carrier filter, and if clogging is found, replace with a new part.2. Check the camshaft journals for damage and wear. Replace the camshaft if faulty.3. Check the cam face condition of camshaft, and remove the minor faults by grinding with oil stone. Replace the camshaft if ...

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