C1179

Code

Other C — Chassis

Speed Control Actuator Assembly Cable Slack Failure

Brand: Other

Type: C — Chassis

Views: UK: 25 EN: 34 RU: 31

AI status

Completed

ready

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Page language: EN

Causes

Worn, stretched or frayed actuator cable
Loose or improperly adjusted cable end or anchor
Damaged or binding cable sheath/routing
Failed speed control actuator (internal wear or broken spring)
Faulty actuator position or tension sensor
Connector corrosion or wiring fault between actuator and ABS/ECU

Symptoms

Cruise control unavailable, inconsistent or unable to hold set speed
Cruise control warning lamp or check engine light illuminated
Loss of speed control or limp/limitation of related features
Unusual throttle or actuator noise during cruise engage/disengage
Related stability/traction functions may be affected on some vehicles

What to check

Read stored and pending codes and freeze-frame data with a scan tool
Visually inspect cable routing, sheath, attachment points and actuator
Check actuator connector for corrosion, water ingress or damaged pins
Manually check cable free-play/slack against vehicle service specification
Command actuator with a diagnostic tool and observe movement/response
Monitor actuator position/tension sensor values while commanding actuator

Signal parameters

Actuator position sensor voltage: typically 0.5–4.5 V proportional to position (refer to vehicle spec)
Actuator/tension sensor resistance or voltage should change smoothly when commanded
Cable free-play/slack should be within manufacturer spec (typical workshop check:
Commanded actuator movement vs measured position should be correlated (no movement or erratic values indicates mechanical or sensor fault)
No intermittent communication errors on the data bus when commanding actuator

Diagnostic algorithm

Use a scan tool to record stored/pending codes and freeze-frame data. Note related codes (VSS, CAN bus, actuator faults).
Perform a visual inspection: follow the cable from actuator to throttle/bracket. Look for frays, kinks, rubbing, corrosion, broken clips, or improper routing.
With ignition on (engine off) verify connector integrity at the actuator: unplug and inspect pins for corrosion/loose terminals, then reseat connector.
Measure cable slack/free-play at the service point and compare to the vehicle manufacturer specification. If slack exceeds spec, loosen or adjust per service manual and retest.
Command the actuator with a diagnostic tool and observe movement and actuator position sensor output. Confirm the sensor voltage changes smoothly and matches commanded travel.
If actuator does not move or movement is weak, inspect for mechanical binding at mounting points and check throttle linkage or cable attachment for wear or breakage.
Check wiring continuity and for short/open faults between actuator connector and control module. Repair any damaged wiring or terminals.
If wiring and mechanical parts are good but sensor output is out of range or erratic, replace the actuator assembly (or sensor if serviceable) and recheck.
After repair, clear codes, perform actuator relearn/calibration if required by manufacturer, and road-test to confirm proper operation and that C1179 does not reappear.
If fault persists after replacing/adjusting the cable and actuator, inspect related systems (vehicle speed sensor, control module communications) and consult manufacturer technical service information.

Likely causes

Visible cable damage or fraying at bends or attachment points
Cable anchor bolt or bracket loose or missing
Actuator does not move freely when commanded (mechanical seizure)
Actuator position sensor output out of expected range or intermittent
Corroded connector or broken wire at actuator harness
Cable has excessive free-play when measured against manufacturer spec

Fault status

⚠️ Status

C1179 — Speed Control Actuator Assembly Cable Slack Failure: the control module detected cable slack/free-play outside allowable range or unreliable actuator position/tension feedback.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0 - 2.5 hours