Diagnostic Aids
WARNING: This page is about a different car, the 2007 GMC Sierra, 2007 GMC Cab & Chassis Sierra, 2007 Chevrolet Silverado, and 2007 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- A slight to moderate resistance of 10-20 ohms on the MAF sensor ignition 1 voltage circuit may cause this DTC to set.
- A skewed MAF sensor, an intake air flow restriction or any unmetered air that enters the engine downstream of the MAF sensor may cause this DTC to set.
- A wide open throttle (WOT) acceleration from a stop should cause the MAF sensor parameter on the scan tool to increase rapidly. This increase should be from 6-38 g/s at idle to 380 g/s or more at the time of the 2-3 shift.
- An aftermarket exhaust system may reduce engine back-pressure excessively and cause this DTC to set.
CAUTION:
Refer to Road Test Caution
.