P0102 on a GMC: Causes, Fixes & Repair Cost

🟠 Moderate severity · drivable

Usually drivable, but a weak MAF signal can cause rough idling or stalling, so get it checked soon.

What P0102 means on a GMC

On a GMC, P0102 means the mass air flow (MAF) sensor is sending a signal lower than the engine computer expects. The computer can't measure the air coming in, so fuel delivery goes off and the engine may idle rough, hesitate, or stall.

Is P0102 common on GMCs?

P0102 shows up on GMC trucks and SUVs, especially the Sierra with the 5.3L V8 and the Terrain and Acadia with four-cylinder and V6 engines. The MAF sensor sits in the intake tube and gets contaminated over time; dirty air filters and wiring issues at the connector are also common on these models.

Commonly reported on: Sierra, Terrain, Acadia, Canyon.

Symptoms

Check engine light is on
Rough idle or stalling
Hesitation when accelerating
Poor fuel economy

Common causes

most common: Dirty or contaminated MAF sensor
common: Loose or corroded MAF sensor connector or wiring
common: Clogged air filter restricting airflow
less common: Faulty MAF sensor that needs replacement

How to fix it

Fix	DIY?	Typical cost
Clean the MAF sensor with MAF cleaner spray	Yes	$10–20
Replace the air filter	Yes	$15–40
Repair the MAF sensor connector or wiring	Mechanic	$100–250
Replace the MAF sensor	Yes	$90–280