Diagnostic Aids

WARNING: This page is about a different car, the 2004 GMC Sierra and 2004 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Fuel contamination, such as water will effect fuel trim.
A malfunctioning MAF sensor can cause a rich condition and set this DTC. Refer to DTC P0101 (With Throttle Actuator Control) in Engine Controls in the C/K Pickup Service Manual.
Use a scan tool in order to review Failure Records. If an intermittent condition is suspected, refer to Intermittent Conditions .