C1109 Buick 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 Buick 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.
Code C1109 Buick Description
What are the Possible Causes of the DTC C1109 Buick?
- 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 Buick?
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 Buick 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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Frequently Asked Questions about C1109 Buick Code
1. What does the OBDII code C1109 mean on a Buick?
The code C1109 indicates that the throttle position sensor did not return to the idle position after a self-test procedure.
2. What are common symptoms of the C1109 code on a Buick?
Symptoms may include rough idling, poor acceleration, unexpected stalling, and the Check Engine Light or other warning lights illuminating.
3. What causes the C1109 code to appear on a Buick?
Common causes include a faulty throttle position sensor (TPS), a sticking throttle body, electrical wiring issues, or a problem with the throttle linkage.
4. Can a dirty throttle body cause the C1109 code on a Buick?
Yes, carbon buildup in the throttle body can prevent the throttle plate from fully closing, triggering the C1109 code.
5. How can I diagnose the C1109 code on my Buick?
Start by inspecting the throttle body for dirt or obstructions, check the throttle position sensor for proper function, and inspect the wiring and connectors for damage or corrosion.
6. Is it safe to drive with the C1109 code on a Buick?
While the car may still be drivable, it can experience reduced performance and safety risks due to potential stalling or hesitation. It's best to address the issue promptly.
7. How can I fix the C1109 code on my Buick?
Cleaning the throttle body, replacing the throttle position sensor, or repairing damaged wiring may resolve the issue. In some cases, a throttle body recalibration may be necessary.
8. Can I clear the C1109 code without making repairs?
Clearing the code without addressing the underlying issue may cause it to return. Proper diagnosis and repair are recommended to resolve the problem.
9. How much does it cost to fix the C1109 code on a Buick?
Costs can vary depending on the exact issue, but throttle body cleaning typically costs $100–$200, and a new TPS or related repairs may range from $150–$400.
10. What tools are needed to troubleshoot the C1109 code on a Buick?
You’ll need an OBDII scanner, a multimeter for electrical testing, and basic tools for inspecting and cleaning the throttle body or replacing components.
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