What Does C1179 Mean?
The speed control (cruise control) actuator assembly cable has excessive slack, meaning the throttle cable connected to the cruise control servo is not maintaining proper tension. This prevents the cruise control system from accurately controlling vehicle speed. The driver will notice that cruise control either does not engage, surges, or fails to maintain the set speed.
Common Causes
35%
Stretched or maladjusted cruise control cable
25%
Cruise control actuator servo motor worn or faulty, not taking up cable slack
20%
Cable end fitting disconnected or broken at the throttle body or actuator
15%
Throttle body butterfly not returning to rest position properly, creating perceived slack
5%
Actuator assembly internal gear or linkage failure
Diagnostic Steps
1
Inspect the cruise control cable from the actuator to the throttle body. Check that both end fittings are securely attached and that the cable outer sheath is not cracked, kinked, or collapsed.
2
With the engine off, have an assistant activate the cruise control set function while you observe the throttle body. The cable should pull the throttle open smoothly. Excessive free play (more than 1/4 inch) at the throttle indicates slack needs adjustment.
3
Check the cable adjustment mechanism (usually a clip or threaded fitting at the actuator). Adjust per manufacturer spec to remove excess slack while ensuring the throttle returns to idle freely.
4
If the cable is properly adjusted but the actuator cannot maintain tension, disconnect the cable from the actuator and test the servo motor operation by commanding it through the scan tool. The motor should smoothly pull and hold.
5
Verify the throttle return spring is intact and the throttle plate moves freely without binding. A sticky throttle can damage the cruise control cable over time.
Estimated Repair Cost
$30 - $250
Parts + labor, varies by vehicle and location
The speed control (cruise control) actuator assembly cable has excessive slack, meaning the throttle cable connected to the cruise control servo is not maintaining proper tension. This prevents the cruise control system from accurately controlling vehicle speed. The driver will notice that cruise co...
The most common cause of C1179 (Speed Control Actuator Assembly Cable Slack Failure) is: Stretched or maladjusted cruise control cable
Typical repair costs for C1179 range from $30 to $250, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Cruise control will not function reliably, but this does not affect normal driving, braking, or engine operation. The vehicle is safe to drive. Repair at your convenience, but be aware that a loose cable near hot exhaust components could melt or create a fire risk in rare cases.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to C1179 to identify the root cause.
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Quick Info
Category
Chassis
System
Speed Control / Cruise Control
Difficulty
Type
Manufacturer
Recommended Tools
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