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.

DTC P0116 is designed to detect a ECT sensor that is skewed high.
An IAT sensor that is skewed low could cause this DTC to set.
When testing the ECT sensor or the IAT sensor, the Temperature Vs Resistance table should be used to determine if a skewed sensor is the problem. See TEMPERATURE VS. RESISTANCE .