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 MANUALSTOYOTA2012PRIUS THREEREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTCRUISE CONTROL SYSTEMSCRUISE CONTROL SYSTEM (EXCEPT PLUG-IN) (DIAGNOSTIC CODES & CIRCUIT TESTS)CRUISE CONTROL SYSTEMDTC U0122: LOST COMMUNICATION WITH VEHICLE DYNAMICS CONTROL MODULEPROCEDURE
2012 Toyota Prius Three
DTC U0122: Lost Communication with Vehicle Dynamics Control Module: Procedure
2012 Toyota Prius ThreeSECTION Procedure
- CHECK CAN COMMUNICATION SYSTEM
- Connect the Techstream to the DLC3.
- Select "Bus Check" from the "System Select".
- Select "Communication Malfunction DTC" from the "Bus Check" screen, and then select "Enter".
Result
Result Proceed to CAN communication system DTC is not output A CAN communication system DTC is output B
B → See step 3
A → See step 2
- USE SIMULATION METHOD TO CHECK. Refer to HOW TO PROCEED WITH TROUBLESHOOTING
- GO TO CAN COMMUNICATION SYSTEM. Refer to HOW TO PROCEED WITH TROUBLESHOOTING
RENDER: 1.0x
NO RELATED
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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.