Diagnostic Fault Information
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.
DTC P0403, P0404, P0405, P0406, or P042E
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
| 5-Volt Reference | P0641, P0532, P0452, P0107 | P0405 | P0641 | - |
| Sensor Signal | P0405 | P0405 | P0406 | - |
| Low Reference | - | P0406 | - | - |
| EGR Solenoid High Control | - | P0403 | P0403 | - |
| EGR Solenoid Low Control | - | P0403 | - | - |
Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.