Conditions for Setting the DTC
WARNING: This page is about a different car, the 2009 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
P0411
- The ECM determines that the difference between the predicted system pressure and the actual system pressure is greater than 5 kPa.
OR
The ECM determines that the difference between the predicted system pressure and the actual system pressure is less than -5 kPa.
- DTC P0411 sets during phase 1 and within 22 seconds when the above conditions are met.
P0412 or P0418
- The ECM determines that the actual and expected states of the AIR solenoid and AIR pump relay control circuits do not match.
- DTCs P0412 or P0418 set when the above condition exists for greater than 4 seconds.
P2440
- The ECM determines that the actual AIR system pressure is 3 kPa less than the predicted AIR system pressure.
- DTC P2440 sets during phase 2 and when the above condition exists for greater than 2 seconds.
P2444
- The ECM determines that the actual AIR system pressure is 2.5 kPa greater than the predicted AIR system pressure.
- DTC P2444 sets during phase 3 and when the above condition exists for greater than 2 seconds.