P0102 Buick 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 Buick 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.
Code P0102 Buick Description
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.
What are the Possible Causes of the DTC P0102 Buick?
- 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 Buick?
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.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0102 Buick 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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Frequently Asked Questions about P0102 Buick Code
1. What are the common symptoms of OBDII code P0102 in a Buick?
The common symptoms of OBDII code P0102 in a Buick include poor engine performance, rough idling, stalling, decreased fuel efficiency, and possibly a check engine light.
2. What does the OBDII code P0102 indicate in a Buick?
OBDII code P0102 in a Buick indicates a problem with the Mass or Volume Air Flow Circuit, specifically a low input signal being detected by the Engine Control Module (ECM).
3. What are the possible causes of OBDII code P0102 in a Buick?
The possible causes of OBDII code P0102 in a Buick include a dirty or faulty mass air flow sensor, vacuum leaks, wiring issues, a clogged air filter, or a faulty ECM.
4. How can I diagnose the cause of OBDII code P0102 in my Buick?
Diagnosing OBDII code P0102 in a Buick involves checking the mass air flow sensor for dirt or damage, inspecting the air intake system for leaks, testing the wiring and connectors, and scanning for any other related codes.
5. Can a dirty air filter trigger OBDII code P0102 in a Buick?
Yes, a dirty air filter can restrict airflow to the mass air flow sensor, leading to inaccurate readings and potentially triggering OBDII code P0102 in a Buick.
6. How can I repair OBDII code P0102 in my Buick?
To repair OBDII code P0102 in a Buick, you may need to clean or replace the mass air flow sensor, fix any vacuum leaks, replace the air filter, repair damaged wiring, or reset the ECM after addressing the underlying issue.
7. Is it safe to continue driving with OBDII code P0102 illuminated in a Buick?
It is generally not recommended to continue driving with OBDII code P0102 illuminated in a Buick, as it can lead to further engine damage and decreased performance. It's best to address the issue promptly.
8. Can a faulty ECM cause OBDII code P0102 in a Buick?
Yes, a faulty Engine Control Module (ECM) can potentially cause OBDII code P0102 in a Buick by not receiving or processing the correct signal from the mass air flow sensor.
9. How important is the mass air flow sensor in a Buick's engine performance?
The mass air flow sensor is crucial for measuring the amount of air entering the engine, which helps the ECM calculate the correct air-fuel mixture for optimal performance and fuel efficiency in a Buick.
10. Will resetting the ECM clear OBDII code P0102 in a Buick?
Resetting the ECM may temporarily clear OBDII code P0102 in a Buick, but it will likely return if the underlying issue, such as a faulty mass air flow sensor or wiring problem, is not addressed.
Discuss the causes and fixes for P0102 Buick OBDII Code
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Sometimes codes combine. Po102 1 and 3 2 and 4 being po446. Most times only po 102. I know
Code meanings. Why connected. Why no one mentions vaf ?-
Those codes can appear together because the engine computer uses the MAF signal as part of several calculations, including EVAP system monitoring. When the MAF signal is incorrect or too low (P0102), the ECM can’t accurately calculate airflow or fuel vapor flow, so it may also trigger EVAP-related codes like P0446.
In other words, the second code doesn’t necessarily mean the EVAP system has a separate failure — sometimes it’s reacting to bad airflow data from the MAF.
As for the VAF question, most modern Buicks don’t use a true VAF (vane air flow) sensor anymore. Older systems used a mechanical flap-type meter (VAF), but newer vehicles use MAF sensors instead. They measure airflow electronically with a hot-wire or hot-film element rather than a moving vane, which is why most diagnostics and documentation only reference MAF.
If you’re seeing P0102 frequently, the things to check first are:
• Dirty or failing MAF sensor
• Intake duct leaks between the air filter and throttle body
• Poor electrical connection at the MAF sensor
• Restricted air filter or debris in the intake
• Wiring damage causing low voltage signalIf the MAF signal drops out or reads too low, it can confuse other systems, which is why multiple codes sometimes appear at the same time.
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