P1101 on GMC
Intake Airflow System Performance
P1101 on GMC vehicles indicates intake airflow system performance. Au7o has documented this code across 1 GMC model — most commonly on Terrain. This manufacturer-related code (common on GM engines) means the intake airflow system is not performing within expected limits. The computer cross-checks the mass airflow (MAF) sensor reading against other inputs like throttle position and manifold pressure, and the values don't agree, suggesting metered airflow is wrong or air is getting in unmeasured. It often appears alongside lean-condition codes. Symptoms can include rough idle, hesitation, reduced power, and a check engine light.
Common Causes of P1101
- •Dirty or failing mass airflow (MAF) sensor
- •Unmetered air/vacuum leak (intake duct, hose, or gasket)
- •Loose or cracked air intake tube/boot
- •Dirty or clogged air filter
- •Faulty PCV system or hose
- •Throttle body issues or carbon buildup
- •Faulty manifold absolute pressure (MAP) sensor
- •Wiring/connector problems at the MAF sensor
P1101 on GMC by Model
GMC Terrain(1 issue)
- Charge Air Cooler Outlet Duct Disconnecting at the Throttle Body - Sudden Power Loss and Stall2018-2022
On 1.5L LYX-equipped Terrains the charge air cooler outlet tube can separate from the throttle body inlet. The retaining clip design does not hold the duct under boost pressure and heat cycling, so the tube pops off, dumping boost and unmetered air. GM issued Service Update N192266090 covering the charge air cooler duct disconnect at the throttle body on 2019 Malibu, Equinox and Terrain 1.5L vehicles, and the condition is further covered by field bulletins PIP5651 and 22-NA-224 across the 2018-2022 range. This is separate from the frozen-CAC condition: the cooler is fine, the connection has come apart. It is also distinct from the throttle body / TPS electrical failure already documented, because the fault is mechanical air-path separation.
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View P1101 across all makes →Frequently Asked Questions
What does P1101 mean on GMC?▼
P1101 stands for "Intake Airflow System Performance." This manufacturer-related code (common on GM engines) means the intake airflow system is not performing within expected limits. The computer cross-checks the mass airflow (MAF) sensor reading against other inputs like throttle position and manifold pressure, and the values don't agree, suggesting metered airflow is wrong or air is getting in unmeasured. It often appears alongside lean-condition codes. Symptoms can include rough idle, hesitation, reduced power, and a check engine light. On GMC specifically, this code is documented across 1 model.
What causes P1101 on GMC vehicles?▼
Common causes on GMC: Dirty or failing mass airflow (MAF) sensor, Unmetered air/vacuum leak (intake duct, hose, or gasket), Loose or cracked air intake tube/boot, Dirty or clogged air filter, Faulty PCV system or hose. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P1101 on a GMC?▼
Repair costs vary widely depending on the root cause and specific GMC model.
Which GMC models have P1101 documented?▼
Au7o has documented P1101 on 1 GMC model: Terrain.