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Engine-Codes – GMC – P0102 2018 GMC Sierra

P0102 2018 GMC Sierra Code - Mass or Volume Air Flow Circuit Low Input

Quick Answer

The P0102 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates a problem with the Mass or Volume Air Flow Circuit Low Input. Common causes include Faulty MAF sensor, Dirty or contaminated MAF sensor, Damaged MAF sensor wiring. 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
P0102 2018 GMC Sierra indicates Mass or Volume Air Flow Circuit Low Input.
Common causes
Common causes include Faulty MAF sensor, Dirty or contaminated MAF sensor, Damaged MAF sensor wiring.
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 12, 2024
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Code P0102 2018 GMC Sierra Description

The P0102 diagnostic trouble code (DTC) for a 2018 GMC Sierra indicates a problem with the Mass or Volume Air Flow Circuit Low Input. This code specifically points to a lower than expected voltage output from the Mass Air Flow (MAF) sensor to the Engine Control Module (ECM). The MAF sensor is a crucial component that measures the amount of air entering the engine, allowing the ECM to calculate the correct air-fuel mixture for efficient combustion. When the MAF sensor detects a lower than expected voltage, it can lead to a variety of issues that can affect the vehicle's performance and fuel efficiency.

OBDII Code P0102 2018 GMC Sierra - Mass or Volume Air Flow Circuit Low Input
P0102 2018 GMC Sierra Code - Mass or Volume Air Flow Circuit Low Input

Common Causes of P0102 2018 GMC Sierra

  1. Faulty MAF sensor
  2. Dirty or contaminated MAF sensor
  3. Damaged MAF sensor wiring
  4. Vacuum leaks in the intake system
  5. Issues with the Engine Control Module (ECM)

Symptoms of P0102 2018 GMC Sierra

  1. Check Engine Light illuminated on the dashboard
  2. Poor fuel economy
  3. Rough idling or stalling
  4. Hesitation or lack of power during acceleration
  5. Engine misfires

How to Fix P0102 2018 GMC Sierra

  1. Begin by diagnosing the issue using a scan tool to confirm the P0102 code and identify the specific problem with the MAF sensor.
  2. Inspect the MAF sensor for any visible damage, contamination, or debris that may be affecting its performance. Clean or replace the sensor as necessary.
  3. Check the MAF sensor wiring for any fraying, breaks, or loose connections. Repair or replace damaged wiring.
  4. Inspect the intake system for any vacuum leaks that could be affecting the MAF sensor readings. Repair any leaks found.
  5. Clear the DTC and test drive the vehicle to ensure the issue has been resolved and the Check Engine Light does not reappear.

Cost to Fix P0102 2018 GMC Sierra

The typical repair costs for resolving a P0102 code on a 2018 GMC Sierra can range from $100 to $500, depending on the specific cause of the issue and the required repairs. This estimate includes the cost of parts such as a new MAF sensor, wiring repairs, and labor charges. It's important to note that the actual cost can vary based on factors such as the location of the repair shop, the make and model of the vehicle, and the availability of parts. Additionally, diagnostic time and labor rates can impact the overall cost, with rates typically ranging between $80 and $150 per hour. It's recommended to consult with a trusted mechanic or repair shop for a more accurate estimate based on the specific circumstances.

What does this mean?

Tech Notes for P0102 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.

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