A Chevy Silverado P0102 OBDII code is a “Mass Air Flow Circuit Signal Low.”
While a faulty MAF sensor is the usual problem other things can also cause the error.
What Is a P0102 Chevy Silverado OBDII Error Code?
A P0102 OBDII code “Mass Air Flow Circuit Signal Low” or “Mass or VAF A Ckt Low Input” error.
The MAF is located on the air filter box and measures airflow going into an engine.
A P0102 OBDII Code indicates there is an error with the MAF sensor, and airflow information is not getting received by the onboard computer.
The ECM uses this information to adjust the air/fuel ratio.
If the data the EMC receives is bad, the engine will run poorly.
4 Cause and Fixes P0102 Chevy Silverado
- Fix #1: Dirty MAF Sensor
- Fix #2: Faulty MAF Sensor
- Fix #3: Vacuum Leak
- Fix #4: Wiring
A dirty MAF Sensor is the most common cause of P0102 OBDII error code on a Chevy Silverado.
They are easy to clean and are a fix that falls in the DIY category.
Of course, if in doubt, be sure to take your vehicle to a professional.
The cleaner can be bought at an auto parts store or online on Amazon or eBay.
Example MAF Sensor Cleaner on Amazon
CRC 05110 Mass Air Flow Sensor Cleaner – 11 Wt Oz.
The MAF sensor can be bought with the housing or separately.
Most buy with the housing since it is sealed good and there is not much difference in price.
Example Chevy Silvarado MAF Sensor and Housing on Amazon
NewYall Mass Air Flow MAF Sensor with Housing
A vacuum leak can also cause a P0102 error code in some scenarios.
Since the MAF sensor detects the air flow difference between the air intake and manifold, a vacuum leak in the manifold can cause an issue.
The wiring can also be a source of failure if there is a shorted or open wire.
The wiring harness can have a pin that is bad, which will cause a bad connection and failure.
Check the wiring harness and use a multimeter to check the wiring for any possible shorts or open wires.
If you have a Chevy Silverado with a check engine light, and after scanning for a trouble code, you get a P0102, there is an issue with the ECM reading the mass airflow.
This is usually a problem with the mass airflow MAF sensor low voltage output but can also be caused by other things.
The sensor monitors the air entering the engine and measures the amount which is reported to the EMC for air fuelr ratio mixture.
P0102 symptoms can vary from the vehicle running to fine to sputtering and misfiring.
How badly the Silverado runs will depend on how bad the information the onboard computer is receiving.
If the engine light comes on and a code reader gives a P0102, it should be fixed even if there are no symptoms, as the problem will likely become worse.
The issue is often fixed by backyard mechanics with basic automotive repair knowledge.
The first step is to clean the MAF sensor and see if the error clears.
Also, check the MAF sensor wires and electrical harness as bad connections will cause the same problems as a bad sensor.
The next step is usually to replace the sensor since they are low cost and rule it out as a possible cause.
If none of the above steps fix the error, a vacuum leak or wiring issue may be the cause.
Have you had problems with a Chevy Silverado and a P0102 code? Let us know your thoughts below.