Conditions for Running the DTC
WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
P0403, P0404, P0405, P0406, P042E
- The Ignition 1 Signal parameter is between 9-18 volts.
- The engine is cranking or running.
- The DTC P0401 intrusive test is not active.
- These DTCs run continuously once the above conditions are met.
P0404
- The EGR valve is commanded open.
- DTC P0641 and P0651 are not set.
P0405
DTC P0641 and P0651 are not set.
P0406
- DTC P0641 and P0651 are not set.
- The EGR valve is not being commanded with a scan tool.
P042E
DTC P0641 and P0651 are not set.