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Engine-Codes – GMC – P0103 2018 GMC Sierra

P0103 2018 GMC Sierra Code - Mass or Volume Air Flow Circuit High Input

Quick Answer

The P0103 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates a problem with the Mass or Volume Air Flow Circuit High Input. Common causes include Faulty MAF sensor, Damaged wiring or connectors in the MAF circuit, Intake air leaks. 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
P0103 2018 GMC Sierra indicates Mass or Volume Air Flow Circuit High Input.
Common causes
Common causes include Faulty MAF sensor, Damaged wiring or connectors in the MAF circuit, Intake air leaks.
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 17, 2024
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Code P0103 2018 GMC Sierra Description

The P0103 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates a problem with the Mass or Volume Air Flow Circuit High Input. This code is triggered when the powertrain control module (PCM) detects that the signal from the mass air flow (MAF) sensor is higher than expected, indicating a potential issue with the air flow entering the engine. The MAF sensor plays a crucial role in measuring the amount of air entering the engine, which is essential for the PCM to calculate the correct air-fuel mixture for optimal combustion.

OBDII Code P0103 2018 GMC Sierra - Mass or Volume Air Flow Circuit High Input
P0103 2018 GMC Sierra Code - Mass or Volume Air Flow Circuit High Input

Common Causes of P0103 2018 GMC Sierra

  1. Faulty MAF sensor
  2. Damaged wiring or connectors in the MAF circuit
  3. Intake air leaks
  4. Clogged air filter
  5. PCM malfunction

Symptoms of P0103 2018 GMC Sierra

  1. Decreased fuel efficiency
  2. Rough idling or stalling
  3. Poor acceleration
  4. Check Engine Light illuminated
  5. Increased emissions

How to Fix P0103 2018 GMC Sierra

  1. Begin by visually inspecting the MAF sensor, wiring, and connectors for any signs of damage or corrosion.
  2. Test the MAF sensor using a multimeter to check for proper voltage output.
  3. Check for any intake air leaks and repair as necessary.
  4. Replace the MAF sensor if it is found to be faulty.
  5. Clear the DTC and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0103 2018 GMC Sierra

The cost of repairing a P0103 DTC on a 2018 GMC Sierra can vary depending on the specific cause of the issue. On average, the cost of replacing a MAF sensor ranges from $100 to $400, including parts and labor. Additional costs may be incurred if wiring repairs or other components need to be replaced. It's important to factor in diagnostic time and labor rates, which can vary between auto repair shops. It's recommended to consult with a professional mechanic for an accurate cost estimate based on your specific vehicle and location.

What does this mean?

Tech Notes for P0103 2018 GMC Sierra

Before replacing the Mass Air Flow (MAF) Sensor, try replacing the air filter and cleaning the Mass Air Flow Sensor with low compress air or Mass Air Flow Sensor Cleaner. Reset code and drive vehicle. If the code comes back, you must replace the Mass Air Flow Sensor to fix the problem.

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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 P0103 2018 GMC Sierra Code

1. What does the OBDII code P0103 for a 2018 GMC Sierra mean?

The code P0103 indicates a high input in the mass or volume air flow circuit of the vehicle.

2. What are the common symptoms of OBDII code P0103 in a 2018 GMC Sierra?

Common symptoms of code P0103 include poor acceleration, engine stalling, rough idling, decreased fuel efficiency, and a check engine light illuminated on the dashboard.

3. What are the possible causes of OBDII code P0103 in a 2018 GMC Sierra?

Possible causes of code P0103 include a dirty or faulty mass air flow sensor, a vacuum leak, damaged air intake hose, issues with the air filter, or a problem with the wiring or connector related to the sensor.

4. How can I diagnose the OBDII code P0103 in my 2018 GMC Sierra?

To diagnose code P0103, you can start by visually inspecting the mass air flow sensor and its connections, checking for any visible damage or debris. You may also use an OBDII scanner to monitor the sensor's readings and verify if they are within the normal range.

5. What are some repair tips for OBDII code P0103 in a 2018 GMC Sierra?

Repair tips for code P0103 include cleaning or replacing the mass air flow sensor, checking and fixing any vacuum leaks, inspecting the air intake system for damage, and ensuring that the sensor's wiring and connector are in good condition.

6. Can I drive my 2018 GMC Sierra with the OBDII code P0103?

It is not recommended to drive your vehicle with an unresolved P0103 code, as it can lead to further damage and potential safety hazards. It's best to address the underlying issue promptly.

7. How much does it typically cost to repair OBDII code P0103 in a 2018 GMC Sierra?

The cost of repairing code P0103 can vary depending on the exact cause of the issue and the labor rates in your area. Generally, the repair cost may range from $100 to $300, but it's advisable to obtain a few quotes from mechanics for an accurate estimate.

8. Can a DIY enthusiast fix OBDII code P0103 in a 2018 GMC Sierra?

Depending on your level of experience and access to tools, DIY enthusiasts may be able to address code P0103 by cleaning or replacing the mass air flow sensor and checking for common issues like vacuum leaks. However, if you are unsure, it's best to seek professional help.

9. Will resetting the OBDII code P0103 in my 2018 GMC Sierra make it go away permanently?

Simply resetting the code without addressing the underlying issue will not make it go away permanently. The problem causing code P0103 needs to be diagnosed and fixed to prevent the code from reappearing.

10. How urgent is it to repair OBDII code P0103 in a 2018 GMC Sierra?

While your vehicle may still be operational with code P0103, it is important to address the issue in a timely manner to prevent further damage and ensure optimal performance. Ignoring the code can lead to more severe problems down the road.

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