Conditions for Setting the DTC
WARNING: This page is about a different car, the 2007 Pontiac G5 Pursuit, 2007 Pontiac G5, and 2007 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
P2120
The APP sensor 1 voltage is less than 0.13 volt, or more than 4.87 volts for more than 0.4 second.
P2122
The ECM detects that the APP sensor 1 voltage is less than 0.13 volt for more than 0.4 second.
P2123
The ECM detects that the APP sensor 1 voltage is more than 4.87 volts for more than 0.4 second.
P2125
The APP sensor 2 voltage is less than 0.13 volt, or more than 4.87 volts for more than 0.4 second.
P2127
The ECM detects that the APP sensor 2 voltage is less than 0.13 volt for more than 0.4 second.
P2128
The ECM detects that the APP sensor 2 voltage is more than 4.87 volts for more than 0.4 second.
P2138
The voltage difference between APP sensor 1 and APP sensor 2 exceeds a predetermined value for more than 2 seconds.