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Engine-Codes – GMC – P0105 GMC

P0105 GMC Code - Manifold Absolute Pressure/Barometric Pressure Circuit Malfunction

Quick Answer

The P0105 code for GMC vehicles indicates a malfunction in the Manifold Absolute Pressure (MAP) or Barometric Pressure Circuit. Common causes include Faulty MAP sensor, Damaged wiring or connectors in the sensor circuit, Vacuum leaks in the intake manifold. 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
P0105 GMC indicates Manifold Absolute Pressure/Barometric Pressure Circuit Malfunction.
Common causes
Common causes include Faulty MAP sensor, Damaged wiring or connectors in the sensor circuit, Vacuum leaks in the intake manifold.
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 09, 2024
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Code P0105 GMC Description

The P0105 code for GMC vehicles indicates a malfunction in the Manifold Absolute Pressure (MAP) or Barometric Pressure Circuit. The MAP sensor is responsible for measuring the pressure within the intake manifold, which helps the engine control unit (ECU) determine the correct air/fuel ratio for combustion. The barometric pressure sensor, on the other hand, measures the atmospheric pressure outside the vehicle, which is crucial for engine performance at different altitudes.

OBDII Code P0105 GMC - Manifold Absolute Pressure/Barometric Pressure Circuit Malfunction
P0105 GMC Code - Manifold Absolute Pressure/Barometric Pressure Circuit Malfunction

Common Causes of P0105 GMC

  1. Faulty MAP sensor
  2. Damaged wiring or connectors in the sensor circuit
  3. Vacuum leaks in the intake manifold
  4. Issues with the ECU
  5. Barometric pressure sensor malfunction

Symptoms of P0105 GMC

  1. Rough idling or stalling
  2. Poor acceleration or hesitation
  3. Check Engine Light illuminated
  4. Decreased fuel efficiency
  5. Difficulty starting the engine

How to Fix P0105 GMC

  1. Begin by connecting a diagnostic scanner to the vehicle's OBD-II port to retrieve the specific trouble codes and confirm the P0105 code for the GMC.
  2. Inspect the MAP sensor and barometric pressure sensor for any visible signs of damage or corrosion. Replace any faulty sensors.
  3. Check the wiring and connectors in the sensor circuit for any breaks, shorts, or loose connections. Repair or replace as necessary.
  4. Perform a smoke test to detect any vacuum leaks in the intake manifold. Repair leaks to ensure proper pressure readings.
  5. Clear the trouble codes from the ECU's memory and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0105 GMC

The typical repair costs for addressing a P0105 code on a GMC vehicle can range from $100 to $300, depending on the specific cause of the issue and the cost of parts and labor. Keep in mind that prices can vary based on the location of the repair shop, the make and model of the vehicle, and the type of engine. It's advisable to check with local auto repair shops for a more accurate estimate based on your specific circumstances. Additionally, diagnostic time and labor rates can affect the final cost, with rates typically ranging from $80 to $150 per hour.

What does this mean?

Tech Notes for P0105 GMC









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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 P0105 GMC Code

1. What are the common symptoms of OBDII code P0105 in a GMC vehicle?

- Common symptoms include poor engine performance, rough idling, stalling, decreased fuel efficiency, and illuminated Check Engine Light.

2. What does the OBDII code P0105 for GMC indicate?

- This code indicates a malfunction in the Manifold Absolute Pressure (MAP) or Barometric Pressure (BARO) circuit.

3. What are the possible causes of OBDII code P0105 in a GMC vehicle?

- Possible causes include a faulty MAP sensor, damaged wiring or connectors in the MAP circuit, a vacuum leak, or a problem with the PCM (Powertrain Control Module).

4. How can I diagnose the cause of OBDII code P0105 in my GMC?

- You can use a scan tool to read the code and data from the MAP sensor to check for proper sensor operation, inspect the wiring and connectors for damage, perform a vacuum leak test, and test the PCM if necessary.

5. Can I still drive my GMC with the P0105 code?

- It is not recommended to drive your vehicle with code P0105 as it can lead to more serious engine problems and further damage if left unresolved.

6. Is it possible to repair OBDII code P0105 in my GMC by myself?

- The repair for code P0105 can vary in complexity, but tasks such as checking for vacuum leaks or replacing a faulty MAP sensor can often be done by DIY enthusiasts with the right tools and knowledge.

7. How much does it typically cost to fix OBDII code P0105 in a GMC?

- The cost of fixing code P0105 can vary depending on the exact cause of the issue and whether you do the repairs yourself or take it to a mechanic. Costs can range from a few dollars for a simple fix to a few hundred dollars for more extensive repairs.

8. Can a dirty air filter cause OBDII code P0105 in a GMC?

- Yes, a dirty air filter can restrict airflow to the MAP sensor, leading to incorrect readings and potentially triggering code P0105. It's a good idea to check and replace the air filter if needed during diagnosis.

9. Will resetting the OBDII code P0105 in my GMC make it go away permanently?

- Resetting the code without addressing the underlying issue will not make it go away permanently. The problem causing the code needs to be diagnosed and repaired for the Check Engine Light to stay off.

10. How long can I safely drive with OBDII code P0105 before getting it fixed?

- It's best to address code P0105 as soon as possible to prevent potential damage to your GMC's engine. Continuing to drive with this code can lead to more severe issues over time.

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