Visual/Physical Check
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2018 GMC Yukon XL, 2018 GMC Yukon, 2018 Chevrolet Tahoe, 2018 Chevrolet Suburban, and 2018 Cadillac Escalade ESV. However, it is still accessible from the selected car via links, so may be relevant.
- Verify the control module grounds are clean, tight and correctly located.
- Verify the vacuum hoses are not split or kinked and are properly connected, as shown on the Vehicle Emission Control Information label.
- Verify the air filter is clean and free from restrictions.
- Verify there is no water intrusion in connectors terminals and components.
- Inspect the air intake ducts for the conditions listed below:
- Collapsed
- Damaged areas
- Looseness
- Incorrect installation
- Leaking
If any condition listed above has allowed non-metered air to enter the air induction system, the Throttle Body Idle Air Flow Compensation Reset procedure must be performed after the repair is complete.
- Inspect for air leaks at the throttle body mounting area, the mass air flow (MAF) sensor and intake manifold sealing surfaces.
- Inspect the wiring harness for the following conditions:
- Poor connections
- Pinches
- Cuts
- Inspect for loose, damaged, unseated or missing sensors/components.
- Inspect the terminals for corrosion and correct contact.