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Engine-Codes – GMC – P1191 GMC

P1191 GMC Code - Intake Air Duct Air Leak

Quick Answer

The P1191 GMC code indicates an intake air duct air leak, which means that there is a problem with the intake system that allows unmetered air to enter the engine. Common causes include Cracked or damaged intake air duct, Loose clamps or connections, Faulty intake manifold gasket. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P1191 GMC indicates Intake Air Duct Air Leak.
Common causes
Common causes include Cracked or damaged intake air duct, Loose clamps or connections, Faulty intake manifold gasket.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 08, 2024
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Code P1191 GMC Description

The P1191 GMC code indicates an intake air duct air leak, which means that there is a problem with the intake system that allows unmetered air to enter the engine. This can lead to a lean air-fuel mixture, causing the engine to run poorly and potentially causing damage over time. The intake air duct is responsible for delivering the right amount of air to the engine for combustion, so any leaks in this system can disrupt the proper functioning of the engine.

OBDII Code P1191 GMC - Intake Air Duct Air Leak
P1191 GMC Code - Intake Air Duct Air Leak

Common Causes of P1191 GMC

  1. Cracked or damaged intake air duct
  2. Loose clamps or connections
  3. Faulty intake manifold gasket
  4. PCV system malfunction

Symptoms of P1191 GMC

  1. Rough idling
  2. Decreased fuel efficiency
  3. Engine stalling
  4. Check Engine Light illuminated

How to Fix P1191 GMC

  1. Inspect the intake air duct and connections for any cracks or damage.
  2. Tighten or replace any loose clamps or connections.
  3. Replace the intake manifold gasket if it is faulty.
  4. Check and repair the PCV system if necessary.
  5. Clear the diagnostic trouble codes and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P1191 GMC

The typical repair costs for addressing an intake air duct air leak can range from $100 to $400, including parts and labor. However, the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's advisable to check local rates for a more precise estimate. Keep in mind that rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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