Diagnostic Aids
WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- If the engine has sat overnight, the IAT sensor 2 and the ECT sensor values should display within 15°C (27°F).
- High resistance on either the IAT sensor 2 signal circuit or the IAT sensor 2 low reference circuit could set this DTC.