P0101 on a GMC: Causes, Fixes & Repair Cost

🟠 Moderate severity · drivable

You can usually keep driving a GMC with P0101, but a bad MAF reading can cause rough running and worse fuel economy until it's fixed.

What P0101 means on a GMC

On a GMC, P0101 means the mass air flow sensor is reporting an airflow reading outside the expected range. GMC's computer uses the MAF reading to balance fuel and air, and a bad reading can cause rough running, hesitation, and worse fuel economy.

Is P0101 common on GMCs?

P0101 appears on GMC models like the Sierra and Yukon, as well as the Terrain and Acadia. A dirty MAF element, an over-oiled air filter, or an intake leak are common causes, and the sensor can fail with age.

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

Symptoms

Check engine light on
Rough idle
Hesitation when accelerating
Worse fuel economy

Common causes

most common: Dirty MAF sensor
common: Intake or vacuum leak
common: Over-oiled aftermarket air filter
less common: Faulty MAF sensor
less common: Damaged wiring or connector

How to fix it

Fix	DIY?	Typical cost
Clean the MAF sensor with sensor-safe cleaner	Yes	$10–20
Inspect the intake tube for leaks	Yes	$0–50
Replace the MAF sensor if cleaning doesn't help	Yes	$120–350
Replace the air filter if it is dirty	Yes	$15–40

Frequently asked questions

Can I drive my GMC with a P0101 code?

Yes, in most cases the truck or SUV will still run, but it may idle rough or hesitate. Get it checked soon because a bad MAF reading can hurt fuel economy.

Why does P0101 come back after I clean the MAF on my GMC?

The sensor may be worn out, or an intake leak or over-oiled air filter is recontaminating it. Check the intake and air filter before replacing the sensor.

How much does it cost to fix P0101 on a GMC?

Cleaning the MAF costs about $10–$20 in cleaner. A replacement sensor usually runs $120–$350, and a new air filter is about $15–$40.