Conditions for Setting the DTC
WARNING: This page is about a different car, the 2008 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
P2237
- The ECM detects that the pumping current circuit is open.
- DTC P2237 sets within 4 seconds when the above condition is met continuously, or within 50 seconds when the above condition is met cumulatively.
P2243
- The ECM detects that the HO2S 1 voltage is less than 0.2 volt or more than 4.7 volts.
- DTC P2243 sets within 4 seconds when the above condition is met continuously, or within 50 seconds when the above condition is met cumulatively.
P2251
- The ECM detects that the reference ground circuit is open.
- DTC P2251 sets within 4 seconds when the above condition is met continuously, or within 50 seconds when the above condition is met cumulatively.
P2626
- The ECM detects that the HO2S 1 voltage is more than 4.81 volts.
- DTC P2626 sets within 4 seconds when the above condition is met continuously, or within 50 seconds when the above condition is met cumulatively.