Symptoms Verification

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.

Verify the following conditions are true:

The engine control module (ECM) and the malfunction indicator lamp (MIL) are operating correctly.
There are no diagnostic trouble codes (DTCs) stored.
The scan tool data is within a normal operating range.
The fuel system is not leaking.
The air filter element is not restricted.
The vehicle tires are correctly inflated and meet original equipment specifications.