Cruise Control Actuator Cable Slack
The C1179 code indicates a fault in the cruise control actuator assembly due to excessive slack in the actuator cable. This Toyota/Lexus-specific code means the cable connecting the cruise control actuator to the throttle body has too much play, preventing the system from properly maintaining or adjusting the set speed. The control module detects this by monitoring actuator position versus expected throttle response.
1. Commonly Affected Makes
2. Most Common Causes
- Excessive slack or stretching of the cruise control actuator cable
- Misadjusted or disconnected cable from its retaining bracket
- Worn cable tensioning mechanism
- Faulty cruise control actuator (stepper motor or solenoid)
- Mechanical damage to the cable mounting bracket
- Dirt or corrosion buildup in the cable system
3. Symptoms You Will Notice
- Cruise control unable to engage or maintain set speed
- Cruise control disengages unexpectedly
- Throttle response feels inconsistent when cruise is active
4. Step-by-Step Diagnosis
Inspect the cruise control actuator cable for visible slack, fraying, or damage
Check cable routing and ensure it is properly seated in all brackets and clips
Verify cable tension adjustment per manufacturer specifications
Test actuator operation using a scan tool to command movement and observe throttle response
Inspect actuator electrical connector and wiring for corrosion or damage
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, it is generally safe to drive, but cruise control will be inoperative. The vehicle can be driven normally without using cruise control.
How much does it cost to fix?▼
Repair costs typically range from $100 to $400, depending on whether the cable needs adjustment or replacement, and if the actuator itself is faulty.