AutoCodes – Generic – C1109

C1109 Code - Power And Ground System

Quick Answer

The Anti-Lock Brake System (ABS) Module Actuator (Electrical / Control Unit) monitors the power supplies. Common causes include Faulty Anti-Lock Brake System (ABS) Module Actuator (Electrical / Control Unit), ABS Module harness is open or shorted, ABS Module 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 indicates Power And Ground System.
Common causes: Common causes include Faulty Anti-Lock Brake System (ABS) Module Actuator (Electrical / Control Unit), ABS Module harness is open or shorted, ABS Module 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 50,225

How popular is this code, among other codes? Medium

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 14, 2020

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

The Anti-Lock Brake System (ABS) Module Actuator (Electrical / Control Unit) monitors the power supplies. The C1109 OBDII code is set when the ABS Module power supply voltage is lower than normal.

OBDII Code C1109 - Power And Ground System - AutoCodes.com — C1109 Code - Power And Ground System

What does this mean?

What are the Possible Causes of the DTC C1109?

Faulty Anti-Lock Brake System (ABS) Module Actuator (Electrical / Control Unit)
ABS Module harness is open or shorted
ABS Module circuit poor electrical connection
Blown ABS Module fuse
Low battery voltage

How to Fix the DTC C1109?

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 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.

Need more information about the C1109 code?

Need more information on how to fix the C1109 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C1109 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C1109 Buick — Throttle Position Did Not Return To Idle After Self-Test
C1109 Cadillac — Throttle Position Did Not Return To Idle After Self-Test
C1109 Chevrolet — Throttle Position Did Not Return To Idle After Self-Test
C1109 GMC — Throttle Position Did Not Return To Idle After Self-Test
C1109 Infiniti — Power And Ground System
C1109 Nissan — Power And Ground System

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.

Frequently Asked Questions about C1109 Code

1. What does OBDII code C1109 indicate?

Code C1109 relates to a malfunction in the Power And Ground System of the vehicle.

2. What are the common symptoms of OBDII code C1109?

Common symptoms include issues with starting the vehicle, dimming or flickering lights, and electrical failures in various components.

3. What are the potential causes of OBDII code C1109?

Possible causes include corroded or loose battery terminals, damaged wiring harnesses, faulty alternator, or a failing battery.

4. How can I diagnose the Power And Ground System related to code C1109?

A thorough visual inspection of the battery terminals, wiring, and connections is essential. Testing the battery, alternator, and checking for any loose or damaged components can help pinpoint the issue.

5. Can I still drive my vehicle with OBDII code C1109 present?

It is not recommended to drive the vehicle with this code as it can lead to electrical failures and potential safety hazards.

6. How can I repair OBDII code C1109?

Repair steps may include cleaning or replacing corroded battery terminals, repairing damaged wiring, testing and potentially replacing the alternator or battery as needed.

7. Is it necessary to reset the code after fixing the Power And Ground System issue?

Yes, clearing the code using an OBDII scanner after resolving the underlying problem is important to reset the vehicle's system and ensure the issue has been successfully addressed.

8. Can a DIY enthusiast fix OBDII code C1109?

Depending on your experience and knowledge, some repairs related to this code may be DIY-friendly, such as checking and cleaning battery terminals. However, more complex issues may require professional assistance.

9. How long does it take to repair OBDII code C1109?

The repair time can vary based on the specific cause of the issue. Simple fixes like cleaning terminals may take a short time, while diagnosing and repairing wiring or component failures can be more time-consuming.

10. Are there preventive measures to avoid OBDII code C1109 in the future?

Regularly checking and maintaining your vehicle's electrical system, ensuring secure battery connections, and promptly addressing any electrical issues can help prevent OBDII code C1109 from occurring.