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P1105 Cadillac Code - Secondary Vacuum Sensor Circuit

Quick Answer

The P1105 diagnostic trouble code (DTC) for Cadillac vehicles refers to an issue with the Secondary Vacuum Sensor Circuit. Common causes include Faulty vacuum sensor, Wiring issues, Vacuum leak. 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
P1105 Cadillac indicates Secondary Vacuum Sensor Circuit.
Common causes
Common causes include Faulty vacuum sensor, Wiring issues, Vacuum leak.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code P1105 Cadillac Description

The P1105 diagnostic trouble code (DTC) for Cadillac vehicles refers to an issue with the Secondary Vacuum Sensor Circuit. This code indicates that there is a problem with the secondary vacuum sensor circuit, which is responsible for monitoring the vacuum levels in the vehicle's intake manifold. The vacuum sensor plays a crucial role in ensuring the engine receives the correct amount of air for combustion, which ultimately affects the engine's performance and fuel efficiency.

OBDII Code P1105 Cadillac - Secondary Vacuum Sensor Circuit
P1105 Cadillac Code - Secondary Vacuum Sensor Circuit

Common Causes of P1105 Cadillac

  1. Faulty vacuum sensor
  2. Wiring issues
  3. Vacuum leak
  4. ECM malfunction
  5. Poor vacuum pressure

Symptoms of P1105 Cadillac

  1. Decreased engine power
  2. Rough idling
  3. Hesitation during acceleration
  4. Stalling
  5. Poor fuel economy

How to Fix P1105 Cadillac

  1. Begin by conducting a thorough inspection of the vacuum sensor circuit, checking for any visible damage or loose connections.
  2. Test the vacuum sensor using a multimeter to determine if it is functioning correctly. Replace the sensor if necessary.
  3. Inspect the wiring harness for any signs of wear or damage. Repair or replace any damaged wires.
  4. Check for vacuum leaks in the intake manifold or vacuum lines. Repair any leaks found.
  5. Clear the DTC using an OBD-II scanner and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P1105 Cadillac

The typical repair costs for addressing the P1105 DTC can vary depending on the extent of the issue and the specific repairs needed. On average, the cost for parts and labor to address this code can range from $200 to $500. It is important to keep in mind that the diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It is recommended to obtain quotes from local auto repair shops for a more accurate estimate.

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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.

Frequently Asked Questions about P1105 Cadillac Code

1. What does the OBDII code P1105 mean on a Cadillac?

P1105 indicates an issue with the Secondary Vacuum Sensor Circuit, which monitors the vacuum levels in the intake system.

2. What are the symptoms of code P1105 on a Cadillac?

Symptoms may include reduced engine performance, poor fuel economy, rough idling, and an illuminated check engine light.

3. What causes the P1105 code to appear?

Common causes include a faulty secondary vacuum sensor, damaged wiring or connectors, vacuum leaks, or issues with the engine control module (ECM).

4. How do I diagnose the P1105 code on my Cadillac?

Start by inspecting the wiring and connectors for damage, checking for vacuum leaks, and testing the secondary vacuum sensor for proper functionality.

5. Can I drive my Cadillac with the P1105 code?

Driving with this code is possible, but it may lead to reduced performance and fuel efficiency. It’s best to address the issue promptly to avoid further damage.

6. How do you fix the P1105 code on a Cadillac?

Repairs may involve replacing the faulty secondary vacuum sensor, repairing damaged wiring, fixing any vacuum leaks, or reprogramming/updating the ECM.

7. How much does it cost to repair code P1105 on a Cadillac?

Repair costs can range from $100 to $300 for parts and labor, depending on the specific cause of the issue.

8. Can a vacuum leak cause the P1105 code?

Yes, a vacuum leak can disrupt the readings from the secondary vacuum sensor and trigger the P1105 code.

9. What tools are needed to troubleshoot the P1105 code?

You may need an OBDII scanner, a multimeter, and a vacuum gauge to diagnose the issue accurately.

10. Will clearing the P1105 code with a scanner fix the problem?

Clearing the code will turn off the check engine light temporarily, but the issue will return if the underlying problem is not fixed.

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