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.

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HOMESERVICE MANUALSSUBARU2014OUTBACK 2.5I, STANDARD TRANSREPAIR AND DIAGNOSISACCESSORIES & EQUIPMENTCOMMUNICATION DEVICESLAN COMMUNICATION SYSTEM (DIAGNOSTICS)DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)DTC U1212 CAN-HS TCM DATA ABNORMALTROUBLE SYMPTOM

2014 Subaru Outback 2.5i, Standard Trans

DTC U1212 Can-HS TCM Data Abnormal: Trouble Symptom

2014 Subaru Outback 2.5i, Standard TransSECTION Trouble Symptom

SPORT indicator light blinks.

DIAGNOSTIC PROCEDURE

Step	Check	Yes	No
1 CHECK DTC. Using the Subaru Select Monitor, read all DTCs.	Is there DTC other than CAN system?	Perform the diagnosis according to DTCs for other control modules.	Go to step 2 .
2 CHECK DTC. Check DTC indicated in CAN system.	Is U1212 a current malfunction?	Go to step 3 .	Go to step 4 .
3 CHECK DTC. Turn the ignition switch to OFF. Disconnect the TCM connector. Connect the disconnected connectors. Using the Subaru Select Monitor, read DTC of CAN system.	Is U1212 a current malfunction?	Replace the TCM. Refer to TRANSMISSION CONTROL MODULE (TCM) .	Go to step 4 .
4 CHECK HARNESS. Shake the harness, and check for poor contact. Using the Subaru Select Monitor, read DTC of CAN system.	Is U1212 a current malfunction?	Repair the poor contact of harness, or replace the harness.	Go to step 5 .
5 CHECK CONNECTOR. Check the connector used for high speed CAN for poor contact.	Is there poor contact of connector?	Repair the connector that has poor contact, or replace harness.	A temporary communication failure may be a possible cause. Clear the DTC memory.

RENDER: 1.0x

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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.