DTC P0263, P0266, P0269, P0272, P0275, P0278, P0281 & P0284: Cylinder Balance System: Description
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2002 GMC Savana Special, 2002 GMC Savana Camper Special, 2002 GMC Savana, 2002 Chevrolet RV Cutaway, and 2002 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
The Powertrain Control Module (PCM) has the ability to increase and decrease the amount of fuel to each cylinder in order to provide smooth idle operation. If the PCM determines that the fuel reduction amount to a specific cylinder exceeds the defined limits, this DTC will set. This DTC only monitors fuel reduction.