So driving home tonight I got a cod it was a p0400 and I no it’s a EGR code but could anyone shed some light on why it came on or what I can do to fix it, btw I have an 2006 ss/sc with only a zzp header and Down Pipe thanks for all the help rich

 

soo no one can help me out

 

Causes

A code P0400 may mean that one or more of the following has happened:

Plugged EGR passage which restricts the flow of exhaust gasses
Faulty EGR solenoid
Faulty EGR solenoid wiring/harness
Vacuum lines damaged/disconnected to the EGR valve solenoid or to the EGR valve
Faulty EGR valve
Possible Solutions

Since EGR valve designs are different, no one test will suffice:

Using a scan tool, operate the EGR valve with the engine running. If the engine stumbles, the problem was likely intermittent wiring problem or intermittent blockage problem
If engine doesn't stumble, operate the EGR valve manually, if possible. If engine doesn't stumble and die, the ports are likely plugged. Removal of valve and cleaning of all ports will be required
Checking of solenoid can only usually be done with a scan tool, because most solenoids operate with a duty cycle of voltage, rather than constant voltage
Check all vacuum lines, hoses, etc for any damage
Visually inspect the solenoid harness and the solenoid for damage
Replace EGR valve

 

thanks for the copy and paste i have already read that and im not sure where the egr solenoid is and im pretty sure all the passage ways for it r all in the head so can any1 give me some real help

 

I will try again.

1. Reset the code and drive it. If code comes on again go to auto parts store buy manual. locate EGR Check to see if vacuum lines are connected, if so remove EGR and look at it and the port. Clean and reinstall. reset code and drive.

2. Locate nearest stealership and bring 300.00

 

well LSJ'S don't have EGR systems so what do i check ?