AutoCodes – Cadillac – P1109 Cadillac

P1109 Cadillac Code - Secondary Port Throttle System

Quick Answer

P1109 Cadillac indicates Secondary Port Throttle System. Common causes for P1109 Cadillac include wiring or connector problems, a faulty related sensor or actuator, and control module or calibration issues. 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: P1109 Cadillac indicates Secondary Port Throttle System.
Common causes: Common causes for P1109 Cadillac include wiring or connector problems, a faulty related sensor or actuator, and control module or calibration issues.
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 5,141

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Apr 19, 2019

Description
How To Fix
Cost to Diagnose
FAQs
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Code P1109 Cadillac Description

OBDII Code P1109 Cadillac - Secondary Port Throttle System - AutoCodes.com — P1109 Cadillac Code - Secondary Port Throttle System

How to Fix the DTC P1109 Cadillac?

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 P1109 Cadillac 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 P1109 Cadillac code?

Need more information on how to fix the P1109 Cadillac code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1109 Cadillac code diagnosed by a professional: Find a repair shop in your area

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 P1109 Cadillac Code

1. What are the common symptoms of OBDII code P1109 in a Cadillac related to the Secondary Port Throttle System?

Symptoms may include reduced engine power, hesitation during acceleration, rough idling, and illuminated Check Engine Light.

2. What can cause the OBDII code P1109 in a Cadillac indicating an issue with the Secondary Port Throttle System?

Possible causes include a faulty secondary port throttle actuator, damaged wiring or connectors, a malfunctioning throttle body, or a problem with the electronic throttle control system.

3. How can I diagnose the OBDII code P1109 in my Cadillac related to the Secondary Port Throttle System?

Diagnosis typically involves using an OBDII scanner to retrieve the code, inspecting the secondary port throttle actuator, checking the wiring and connectors for any damage, and testing the electronic throttle control system components.

4. Can I drive my Cadillac with the OBDII code P1109 indicating a problem with the Secondary Port Throttle System?

Continuing to drive with this code may result in reduced performance and fuel efficiency. It is recommended to address the issue promptly to prevent further damage to the engine.

5. Is it possible to repair the OBDII code P1109 in a Cadillac on my own?

While some DIY enthusiasts may be able to address this issue by replacing the secondary port throttle actuator or repairing wiring connections, it is advisable to seek professional help for an accurate diagnosis and proper repair.

6. How much does it typically cost to repair the OBDII code P1109 in a Cadillac related to the Secondary Port Throttle System?

The cost of repair can vary depending on the root cause of the issue, parts needed, and labor rates. It is recommended to obtain quotes from reputable automotive technicians or repair shops.

7. Can a dirty throttle body cause the OBDII code P1109 in a Cadillac?

Yes, a dirty or clogged throttle body can restrict airflow and cause issues with the secondary port throttle system, potentially triggering the P1109 trouble code.

8. What steps should I take if the OBDII code P1109 in my Cadillac keeps coming back after repairs?

If the code persists after repairs, it is essential to recheck all components related to the secondary port throttle system, ensure proper installation of new parts, and consider seeking assistance from a professional mechanic for a thorough diagnosis.

9. Are there any preventive maintenance tips to avoid encountering the OBDII code P1109 in a Cadillac?

Regularly cleaning the throttle body, inspecting wiring harnesses for damage, and following the manufacturer's recommended maintenance schedule can help prevent issues with the secondary port throttle system and avoid triggering the P1109 trouble code.

10. Can the OBDII code P1109 in a Cadillac related to the Secondary Port Throttle System cause permanent damage if left unresolved?

Continuing to drive with this code may lead to further engine issues or damage over time. It is advisable to address the problem promptly to prevent any long-term consequences.