What causes P0101 on a GMC Terrain?

Common causes of P0101 on GMC Terrain: Dirty or contaminated MAF sensor element (very common on GM trucks); Air filter housing not sealed properly or damaged intake snorkel; Vacuum leak in intake tract between MAF sensor and throttle body; Failed MAF sensor (ACDelco mass air flow sensor).

P0101

P0101 GMC Terrain

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

Fixes for P0101 on GMC Terrain include: Clean MAF sensor with CRC MAF Sensor Cleaner (do not use carb cleaner), Replace MAF sensor with ACDelco 213-4222 or equivalent, Inspect and replace air filter, ensure housing clips are secure, Check for cracked intake duct between air box and throttle body, Inspect for vacuum leaks at intake manifold gaskets.

MAF Sensor Circuit Range/Performance · Powertrain Code · Medium · Repair: Easy

What is P0101?

The MAF sensor readings are outside the expected range for the current operating conditions.

When the GMC Terrain triggers code P0101 (maf sensor circuit range/performance), it typically points to an issue in the powertrain system. Below you'll find the most common causes, symptoms, and repair options specific to the GMC Terrain.

This repair is rated easy, meaning basic tools, no lift needed.

Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your GMC Terrain.

Common Causes on GMC Terrain

Dirty or contaminated MAF sensor element (very common on GM trucks)
Air filter housing not sealed properly or damaged intake snorkel
Vacuum leak in intake tract between MAF sensor and throttle body
Failed MAF sensor (ACDelco mass air flow sensor)

Symptoms

Check Engine Light on
Rough or unstable idle
Hesitation on acceleration
Poor fuel economy
Engine may stall
Black smoke from exhaust in severe cases

Recommended Fixes

Clean MAF sensor with CRC MAF Sensor Cleaner (do not use carb cleaner)

Replace MAF sensor with ACDelco 213-4222 or equivalent

Inspect and replace air filter, ensure housing clips are secure

Check for cracked intake duct between air box and throttle body

Inspect for vacuum leaks at intake manifold gaskets

Notes for GMC Terrain

Cleaning the MAF sensor resolves this code about 60% of the time on GM trucks — always try cleaning first before replacing.

P0101 GMC Terrain

What is P0101?

Common Causes on GMC Terrain

Symptoms

Notes for GMC Terrain

Check GMC Terrain Specs