Diagnostic Aids

WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

An in-line connector could cause an intermittent DTC. Ensure to test for poor connections and pin retention at all in-line connectors. See WIRING DIAGRAMS for connector and locations.
If the condition is not present, see INTERMITTENT OR POOR CONNECTIONS under TROUBLE SHOOTING.
If DTCs P0495 and P0113 are set and the weather is cold, the cooling fan code may be false. Clear DTC P0495, and after an IAT repair, check if the DTC will reset.