Conditions for Running the DTC

WARNING: This page is about a different car, the 2009 Pontiac Torrent and 2009 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.

Before the ECM can report DTC P2271 or P2273 failed, DTCs P0036, P0037, P0038, P0056, P0057, P0058, P013A, P013C, P013E, P0137, P0138, P014A, P0140, P0141, P0157, P0158, P0160, P0161, P0443, P0458, P0459, P2097, P2099, P2178, P2180, P2188, and P2190 must run and pass.
DTC P0461, P0462, P0463, or P0464 is not set.
The engine is operating for greater than 240 revolutions.
The ignition voltage is greater than 10 volts.
The HO2S 2 is at operating temperature for greater than 10 seconds.
The long term fuel control is enabled.
The mass air flow (MAF) signal is greater than 10 g/s.
The MAF sensor is between 6-33 g/s for greater than 3 second during the intrusive test.
DTCs P2271 and P2273 run continuously when the above conditions are met for approximately 10 minutes.