AutoCodes – Hummer – P0102 Hummer

P0102 Hummer Code - Mass or Volume Air Flow Circuit Low Input

Quick Answer

The Mass Air Flow (MAF) sensor is integrated with the multifunction intake air sensor. Common causes include Dirty Air Filter, Dirty Mass Air Flow (MAF) Sensor, 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: P0102 Hummer indicates Mass or Volume Air Flow Circuit Low Input.
Common causes: Common causes include Dirty Air Filter, Dirty Mass Air Flow (MAF) Sensor, 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.

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Code Popularity 10,851

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 22, 2022

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0102 Hummer Description

The Mass Air Flow (MAF) sensor is integrated with the multifunction intake air sensor. The MAF sensor is an air flow meter that measures the amount of air in the sensor bore. The Engine Control Module (ECM) uses the MAF sensor signal to provide the correct fuel delivery for all engine speeds and loads. A small quantity of air entering the engine indicates a deceleration or idle condition. A large quantity of air entering the engine indicates an acceleration or high load condition.
The ECM applies 5 V to the MAF sensor on the MAF sensor signal circuit. The sensor uses voltage to produce a variable frequency signal based on the inlet air flow through the sensor bore. The signal varies with engine load and is displayed by the scan tool as Hertz (Hz) and grams per second (g/s). Ignition voltage and ground circuits are also supplied to the multifunction intake air sensor internal circuits for the Intake Air Temperature (IAT) sensor 2, Humidity sensor, and MAF sensor.
The Diagnostic Trouble Code (DTC) will be set when the ECM detects that the MAF Sensor Signal is less than 850 Hz (about 1.43 g/s) for greater than 10 s.

OBDII Code P0102 Hummer - Mass or Volume Air Flow Circuit Low Input - AutoCodes.com — P0102 Hummer Code - Mass or Volume Air Flow Circuit Low Input

What does this mean?

What are the Possible Causes of the DTC P0102 Hummer?

Dirty Air Filter
Dirty Mass Air Flow (MAF) Sensor
Intake air leaks
Faulty Mass Air Flow Sensor
Mass Air Flow Sensor harness is open or shorted
Mass Air Flow Sensor circuit poor electrical connection

How to Fix the DTC P0102 Hummer?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0102 Hummer code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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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 P0102 Hummer Code

1. What are the common symptoms of OBDII code P0102 in a Hummer?

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

2. What are the possible causes of the P0102 code in a Hummer?

- The code P0102 is typically caused by a faulty mass air flow (MAF) sensor, a dirty or clogged air filter, vacuum leaks, or problems with the wiring or connectors.

3. How can I diagnose the P0102 code in my Hummer?

- Diagnosing the P0102 code involves checking the MAF sensor for proper operation, inspecting the air filter for dirt or clogs, and ensuring there are no vacuum leaks in the intake system.

4. Can I drive my Hummer with the P0102 code present?

- It is not recommended to drive your Hummer with the P0102 code present, as it can lead to further engine damage and decreased performance.

5. How can I fix the P0102 code in my Hummer?

- To fix the P0102 code, you may need to replace the MAF sensor, clean or replace the air filter, repair any vacuum leaks, or repair any wiring or connector issues.

6. Will cleaning the MAF sensor resolve the P0102 code issue in my Hummer?

- Cleaning the MAF sensor might help if the issue is caused by dirt or debris, but if the sensor is faulty, it will likely need to be replaced.

7. What is the importance of the MAF sensor in the operation of a Hummer?

- The MAF sensor measures the amount of air entering the engine, which is crucial for determining the correct air-fuel mixture for optimal engine performance and fuel efficiency.

8. Can extreme weather conditions trigger the P0102 code in a Hummer?

- Extreme weather conditions, such as very high or very low temperatures, can impact the performance of the MAF sensor and potentially trigger the P0102 code.

9. How much does it typically cost to repair the P0102 code in a Hummer?

- The cost of repairing the P0102 code can vary depending on the exact cause of the issue, but it can range from a simple air filter replacement to a more expensive MAF sensor replacement.

10. Is it possible for the P0102 code to return after repairs have been made on a Hummer?

- Yes, if the root cause of the P0102 code was not properly addressed during repairs, the code may return. It is important to thoroughly diagnose and fix the issue to prevent recurrence.