AutoCodes – Chevrolet – C1109 Chevrolet

C1109 Chevrolet Code - Throttle Position Did Not Return To Idle After Self-Test

Quick Answer

The Powertrain Control Module (PCM) monitors the Speed Control Actuator. Common causes include Faulty Speed Control Actuator, Speed Control Actuator harness is open or shorted, Speed Control Actuator circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: C1109 Chevrolet indicates Throttle Position Did Not Return To Idle After Self-Test.
Common causes: Common causes include Faulty Speed Control Actuator, Speed Control Actuator harness is open or shorted, Speed Control Actuator circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 1,426

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 16, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code C1109 Chevrolet Description

The Powertrain Control Module (PCM) monitors the Speed Control Actuator. The PCM sets the OBDII code when the Speed Control Actuator is not to factory specifications.

OBDII Code C1109 Chevrolet - Throttle Position Did Not Return To Idle After Self-Test - AutoCodes.com — C1109 Chevrolet Code - Throttle Position Did Not Return To Idle After Self-Test

What does this mean?

What are the Possible Causes of the DTC C1109 Chevrolet?

Faulty Speed Control Actuator
Speed Control Actuator harness is open or shorted
Speed Control Actuator circuit poor electrical connection

How to Fix the DTC C1109 Chevrolet?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C1109 Chevrolet code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.