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 WRX BaseFACTORY OEM SERVICE PROCEDURE

Multi-Function Display DTCS

MULTI-FUNCTION DISPLAY DIAGNOSTIC TROUBLE CODE IDENTIFICATION

Item	Content	Reference
GERDA MALFUNCTION	When transmitting and receiving of data cannot be done normally between system microcomputer and image microcomputer.	Ref. to MULTI-FUNCTION DISPLAY(DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2223 GERDA MALFUNCTION
FRONT CAMERA CIRCUIT OPEN	Detected when front camera abnormality is detected.	Ref. to MULTI-FUNCTION DISPLAY(DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC B2233 FRONT CAMERA CIRCUIT OPEN
CONTROL MODULE COMMUNICATION BUS OFF	Detected when CAN line abnormality is detected.	Ref. to MULTI-FUNCTION DISPLAY(DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U0073 CONTROL MODULE COMMUNICATION BUS OFF
CAN-HS COUNTER ABNORMAL	Detected when CAN data is abnormal.	Ref. to MULTI-FUNCTION DISPLAY(DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U1201 CAN-HS COUNTER ABNORMAL
LOST COMMUNICATION WITH EyeSight	Detected when CAN data from stereo camera does not arrive.	Ref. to MULTI-FUNCTION DISPLAY(DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U1235 LOST COMMUNICATION WITH EyeSight
INVALID DATA RECEIVED FROM METER (UART)	UART data from the combination meter is abnormal.	Ref. to MULTI-FUNCTION DISPLAY(DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U1650 INVALID DATA RECEIVED FROM METER (UART)
LOST COMMUNICATION WITH METER (UART)	UART data from the combination meter has not arrived.	Ref. to MULTI-FUNCTION DISPLAY(DIAGNOSTICS)>Diagnostic Procedure with Diagnostic Trouble Code (DTC)>DTC U1651 LOST COMMUNICATION WITH METER (UART)

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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