P0404? don't know if I have the codes
Troubleshooting information - from Autozone
EGR Position Sensor Circuit performance probable causes
1 - open or short circuit condition
2 - poor electrical connection
3 - faulty EGR position sensor
System Fault - Exhaust gas recirculation
Explanation - The ECM has detected a fault in the EGR position sensor
1 - crossed out (EGR position sensor - doesn't exist for 5.3L vortec)
2 - open or short circuit condition
3 - failed EGR valve
4 - failed EGR pressure sensor where applicable
5 - crossed thru (EGR position sensor - don't think it exists for 5.3 L vortec)
Also - Code 230? written in hand by person at Autozone
Fuel pump circuit condition
Fuel pump relay circuit is monitored for opens or shorts
1 Fuel pump relay defective
2 check fuse
3 check connector and wiring to relay
OK, it sounds like the EGR valve is leaking. Why the new one set the code may indicate a faulty valve as well. As for the other code, you need to check the wiring under the fuse block, check the fuel pump relay and fuse block. The possible issues for this code are the relay, the wiring from the PCM to the relay or the PCM itself.
So I still have my original GM EGR which I replaced -
I have the first one I bought/installed from Autozone - ~ June 15th, and I have a warranty replacement one from Autozone ~ July 15th. Which one should I install - and need to have battery off for 30 min. to clear code per EGR instructions - correct. At least car idled and started better than when I installed the 6/15 EGR, now with the most recent 7/15 EGR...runs now like my old Mazda truck where you have to help it with the gas pedal to keep it running.
I looked at the EGR lines - didn't see any obvious signs of breakage or obstructions - but do these need to be inspected too. Only other thing done was had a shop replace the spark plugs June 16th - ~ 70,000 miles on the vehicle. maybe they bumped something in the process.
Fuel pump recall done at local dealer ~ 2 years ago. with your fuse recommendation - check the block, but plan to replace the fuel pump relay - look at cables for other shorting or other issue?