Sonic Cruise Control Failure

It could be a few things. Have you checked the fuse box for blown fuses related to cruise control? Inspect the wiring and connections to the cruise control module itself. A loose or corroded connection can cause issues. Do you have experience using a multimeter to check wiring continuity?

I checked the fuses, and they seemed fine. I don't have a multimeter and am not confident with the wiring. Where is the cruise control module located? Is it easily accessible, or do I need to disassemble the dashboard?

Given that you've checked the fuses and aren't comfortable with electrical diagnostics, it's best to take it to a workshop. The error code points to a defective cable or plug connection, which may require specialized tools. It will cost about 95€.

Thanks for the advice! The workshop found a faulty connection. They replaced the connector, and the cruise control is working again. Total cost was 95€, just like you said. I appreciate the help!