P1666

Symptoms

• Cruise control won't turn on
• Cruise control turns off spontaneously
• Cannot set cruise control speed
• Check Engine light comes on
• The cruise control system does not respond to commands

Causes

• Internal malfunction of the cruise control module
• Module power problems
• Short circuit in the module circuit
• Wiring harness damage
• Software error in the module

How to Fix

1. Check cruise control system fuses and relays
2. Check the integrity of the wiring harness to the module
3. Check the module supply voltage
4. Flash or update module software
5. Replace the cruise control module if necessary

Related codes

Error P1666 by Vehicle Brand