DTC U0122: Lost Communication with Vehicle Dynamics Control Module [09/2014 - 11/2017]: Procedure

WARNING: This page is about a different car, the 2017 Lexus RC F, 2016 Lexus RC F, and 2015 Lexus RC F. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR DTCs (CRUISE CONTROL SYSTEM)

Clear the DTCs.
Refer to DTC CHECK / CLEAR [09/2014 - 11/2017]

Powertrain > Cruise Control > Clear DTCs
Perform the following to make sure that the DTC detection conditions are met.
HINT:

If the detection conditions are not met, the malfunction cannot be detected.
1. Drive the vehicle at a speed for which cruise control operation is possible.
2. Turn the cruise control system on using the cruise control switch (ON/OFF button).
3. Push the cruise control switch to -/SET to begin control of vehicle speed by the cruise control system.

Check for DTCs.

Refer to DTC CHECK / CLEAR [09/2014 - 11/2017]

Powertrain > Cruise Control > Trouble Codes

Result

Result	Proceed to
CAN communication system DTCs are not output	A
CAN communication system DTCs are output	B

Result:

USE SIMULATION METHOD TO CHECK. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2014 - 08/2016] , or refer to HOW TO PROCEED WITH TROUBLESHOOTING [08/2016 - 11/2017]

Result:

GO TO CAN COMMUNICATION SYSTEM. Refer to HOW TO PROCEED WITH TROUBLESHOOTING [09/2014 - 11/2017]