The cruise control system comprises a few different components and if any of these fails, it affects the operations.
1. Steering switch
2. Brake switch.
3. Main ON/OFF switch.
4. Wiring circuit (connections)
5. Cruise control Control Module.
6. Power supply
Other system such as ABS or Transmission controls if they malfunctions can affect this too.
I would suggest a scan to check for trouble codes in engine, ABS and Transmission which can affect this.
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Tuesday, November 14th, 2017 AT 9:07 PM