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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), GMC Mechanic
Category: GM
Satisfied Customers: 5783
Experience:  GM Grand Master Technician 2007. 14 years experience.
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GM Impala: 2004 chevy impala dtc p0405 o have replace egr and

Customer Question

2004 chevy impala dtc p0405 o have replace egr and also have cleaned the intake but code still coming back, check engine light does not illuminate right away but you can see is pending with the scanner tool at second or third ignition cicle.
Submitted: 10 months ago.
Category: GM
Expert:  Wayne Crawford replied 10 months ago.
Hello. My name is ***** ***** I will be helping you today.Does your scan tool show live data or is it just a code reader?
Customer: replied 10 months ago.

Hi it's just a code reader

Expert:  Wayne Crawford replied 10 months ago.
Do you have a volt meter?
Customer: replied 10 months ago.

Yes I do

Expert:  Wayne Crawford replied 10 months ago.
With the engine running check the voltages on both the gray and the brown wire and let me know what they are.
Customer: replied 10 months ago.

I have to log out but I'll come back with those results

Expert:  Wayne Crawford replied 10 months ago.
Sounds good. I will be standing by.
Customer: replied 10 months ago.

Got it, the egr was defective, I check for voltage was 5 volts

Expert:  Wayne Crawford replied 10 months ago.
Thats what I figured. Let me know if you need anything further and please be sure to rate my service so I get credit for helping you. Thanks