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Engine-Codes – GMC – P0108 2018 GMC Sierra

P0108 2018 GMC Sierra Code - Manifold Absolute Pressure/Barometric Pressure Circuit High Input

Quick Answer

The P0108 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates a problem with the Manifold Absolute Pressure (MAP) sensor or Barometric Pressure (BARO) sensor circuit registering a high input. Common causes include Faulty MAP sensor or BARO sensor, Damaged or corroded wiring/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
P0108 2018 GMC Sierra indicates Manifold Absolute Pressure/Barometric Pressure Circuit High Input.
Common causes
Common causes include Faulty MAP sensor or BARO sensor, Damaged or corroded wiring/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 15, 2024
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Code P0108 2018 GMC Sierra Description

The P0108 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates a problem with the Manifold Absolute Pressure (MAP) sensor or Barometric Pressure (BARO) sensor circuit registering a high input. The MAP sensor measures the pressure inside the intake manifold, providing crucial data to the engine control module (ECM) to adjust fuel delivery and ignition timing. The BARO sensor, on the other hand, measures the atmospheric pressure outside the vehicle, which is used by the ECM to calculate air density and adjust fuel delivery accordingly.

OBDII Code P0108 2018 GMC Sierra - Manifold Absolute Pressure/Barometric Pressure Circuit High Input
P0108 2018 GMC Sierra Code - Manifold Absolute Pressure/Barometric Pressure Circuit High Input

Common Causes of P0108 2018 GMC Sierra

  1. Faulty MAP sensor or BARO sensor.
  2. Damaged or corroded wiring/connectors in the sensor circuit.
  3. Vacuum leaks in the intake manifold.
  4. Clogged or dirty air filter restricting airflow.
  5. Issues with the ECM or related control modules.

Symptoms of P0108 2018 GMC Sierra

  1. Check Engine Light illuminated on the dashboard.
  2. Reduced fuel efficiency.
  3. Engine stalling or hesitation during acceleration.
  4. Rough idling or misfiring.
  5. Lack of power or responsiveness when driving.

How to Fix P0108 2018 GMC Sierra

  1. Begin by using a diagnostic scanner to retrieve the trouble code and confirm the issue.
  2. Inspect the MAP and BARO sensors, as well as the wiring and connectors for any visible damage or corrosion.
  3. Test the sensors using a multimeter to ensure they are functioning within the manufacturer's specifications.
  4. Check for vacuum leaks in the intake manifold and repair as necessary.
  5. Replace the faulty sensor or repair any damaged wiring/connectors if needed.

Cost to Fix P0108 2018 GMC Sierra

The cost of repairing a P0108 code on a 2018 GMC Sierra can vary depending on the specific cause of the issue. Typically, replacing a faulty MAP or BARO sensor can range from $50 to $200, while repairing wiring or connectors may cost around $100 to $300. Labor costs at auto repair shops can range from $80 to $150 per hour, so the total repair bill could be anywhere from $150 to $500 or more. It's recommended to consult with a professional mechanic for an accurate estimate based on your vehicle's specific needs and location.

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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 P0108 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code P0108 in a 2018 GMC Sierra?

- Common symptoms include poor engine performance, reduced fuel efficiency, rough idling, and potential stalling of the vehicle.

2. What can cause the Manifold Absolute Pressure/Barometric Pressure Circuit High Input code in a 2018 GMC Sierra?

- The code P0108 can be triggered by issues such as a faulty MAP sensor, a vacuum leak in the intake system, or problems with the wiring or connectors related to the sensor.

3. How serious is the P0108 code in a 2018 GMC Sierra?

- While the vehicle may still be operable with the P0108 code, it is crucial to address the issue promptly to prevent potential engine damage and ensure optimal performance and fuel efficiency.

4. Can I continue driving my 2018 GMC Sierra with the P0108 code?

- It is generally not recommended to continue driving the vehicle with the P0108 code present, as it can lead to more severe problems and worsen fuel consumption over time.

5. How can I diagnose the cause of the P0108 code in my 2018 GMC Sierra?

- Diagnosing the P0108 code usually involves using an OBDII scanner to retrieve the code, inspecting the MAP sensor and related components, checking for vacuum leaks, and testing the wiring and connectors for any faults.

6. Is it possible to repair the P0108 code in a 2018 GMC Sierra myself?

- Depending on your level of automotive knowledge and experience, you may be able to address the P0108 code yourself by replacing the MAP sensor, fixing any vacuum leaks, or repairing damaged wiring or connectors.

7. How much does it typically cost to repair the P0108 code in a 2018 GMC Sierra?

- The cost of repairing the P0108 code can vary depending on the underlying cause, but it may range from around $100 to $300 for parts and labor if done at a professional auto repair shop.

8. Will resetting the OBDII code P0108 on my 2018 GMC Sierra make it go away permanently?

- Resetting the code may temporarily turn off the check engine light, but if the underlying issue causing the P0108 code is not addressed, it is likely to reappear after driving a certain distance.

9. Can a dirty air filter cause the P0108 code in a 2018 GMC Sierra?

- While a dirty air filter can affect engine performance, it is not a common cause of the P0108 code. It is recommended to check the MAP sensor, vacuum lines, and related components first.

10. Will driving at high altitudes trigger the P0108 code in my 2018 GMC Sierra?

- Driving at high altitudes can sometimes trigger the P0108 code due to changes in barometric pressure, but if the code persists even at lower altitudes, it is likely caused by a different issue such as a faulty MAP sensor.

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