Section 1069 (Engine Controls Diagnosis - 4.8L, 5.3L, & 6.0L (DTCS P2120 To U0107))

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