Diagnostic Aids

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The most likely cause of the DTC is a leaking intake duct after the MAF sensor.
To run the diagnostic test the following conditions must be met:
- The engine is at full operating temperature.
- The vehicle is in drive.
- The vehicle has been idling for more than 1 minute.
After meeting these conditions, shift the vehicle into park, and hold the engine speed steady between 1,500-2,100 RPM for 30 seconds. If the diagnostic test still fails to run, the vehicle must be driven.