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.
2012 Subaru Outback RFACTORY OEM SERVICE PROCEDURE
LAN System DTCS
LAN DIAGNOSTIC TROUBLE CODES (DTC) LIST
| DTC | Contents | Content of diagnosis | Note |
|---|---|---|---|
| None | Communication for Initializing Impossible | Subaru Select Monitor communication is open or shorted. | Refer to , COMMUNICATION FOR INITIALIZING IMPOSSIBLE , Diagnostic Procedure with Diagnostic Trouble Code (DTC). |
| U1201 | CAN-HS counter abnormal | High speed CAN communication error | Refer to , DTC U1201 CAN-HS COUNTER ABNORMAL , Diagnostic Procedure with Diagnostic Trouble Code (DTC). |
| U1202 | CAN-HS Bus OFF | Communication of some module is shut down. | Refer to , DTC U1202 CAN-HS BUS OFF , Diagnostic Procedure with Diagnostic Trouble Code (DTC). |
| U1211 | CAN-HS ECM data abnormal | Received error data from ECM. | Refer to , DTC U1211 CAN-HS ECM DATA ABNORMAL , Diagnostic Procedure with Diagnostic Trouble Code (DTC). |
| U1212 | CAN-HS TCM data abnormal | Received error data from TCM. | Refer to , DTC U1212 CAN-HS TCM DATA ABNORMAL , Diagnostic Procedure with Diagnostic Trouble Code (DTC). |
| U1213 | CAN-HS VDC Data Abnormal | Received error data from VDC module. | Refer to , DTC U1213 CAN-HS VDC DATA ABNORMAL , Diagnostic Procedure with Diagnostic Trouble Code (DTC). |
| U121A | CAN-HS Meter Unit Data Abnormal | Received error data from meter. | Refer to , DTC U121A CAN-HS METER UNIT DATA ABNORMAL , Diagnostic Procedure with Diagnostic Trouble Code (DTC). |
| U121B | CAN-HS A/C Data Abnormal | Received error data from A/C module. | Refer to , DTC U121B CAN-HS A/C DATA ABNORMAL , Diagnostic Procedure with Diagnostic Trouble Code (DTC). |
| U121C | CAN-HS SCU Data Abnormal | Received error data from SCU. | Refer to , DTC U121C CAN-HS SCU DATA ABNORMAL , Diagnostic Procedure with Diagnostic Trouble Code (DTC). |
| U1219 | CAN-HS EPB Data Abnormal | Received error data from EPB module. | Refer to , DTC U1219 CAN-HS EPB DATA ABNORMAL , Diagnostic Procedure with Diagnostic Trouble Code (DTC). |
| U1221 | CAN-HS ECM no-receive data | Not received data from ECM. | Refer to , DTC U1221 CAN-HS ECM NO-RECEIVE DATA , Diagnostic Procedure with Diagnostic Trouble Code (DTC). |
| U1222 | CAN-HS TCM No-Receive Data | Not received data from TCM. | Refer to , DTC U1222 CAN-HS TCM NO-RECEIVE DATA , Diagnostic Procedure with Diagnostic Trouble Code (DTC). |
| U1223 | CAN-HS VDC No-Receive Data | Not received data from VDC module. | Refer to , DTC U1223 CAN-HS VDC NO-RECEIVE DATA , Diagnostic Procedure with Diagnostic Trouble Code (DTC). |
| U122A | CAN-HS Meter No-Receive Data | Not received data from meter. | Refer to , DTC U122A CAN-HS METER NO-RECEIVE DATA , Diagnostic Procedure with Diagnostic Trouble Code (DTC). |
| U122B | CAN-HS A/C No-Receive Data | Not received data from A/C CM. | Refer to , DTC U122B CAN-HS A/C NO-RECEIVE DATA , Diagnostic Procedure with Diagnostic Trouble Code (DTC). |
| U122C | CAN-HS SCU No-Receive Data | Not received data from SCU. | Refer to , DTC U122C CAN-HS SCU NO-RECEIVE DATA , Diagnostic Procedure with Diagnostic Trouble Code (DTC). |
| U1229 | CAN-HS EPB No-Receive Data | Not received data from EPB module. | Refer to , DTC U1229 CAN-HS EPB NO-RECEIVE DATA , Diagnostic Procedure with Diagnostic Trouble Code (DTC). |
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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