ECU location? - 02 5.3

**TLfuRy** · 10-01-2006, 09:58 AM

Hi guys,
Where is the ecu in an '02 5.3 silverado? I bought my dad's truck and he had said he chipped it - but I have no idea what kind of chip, etc. so I want to look and find out.

Thanks in advance. :)

**NEUMANNZZ** · 10-01-2006, 10:23 AM

under the hood on the driver side forward of the fenderwell.

**TLfuRy** · 10-01-2006, 10:23 AM

Originally Posted by NEUMANNZZ

under the hood on the driver side forward of the fenderwell.

Thank you! :)

**BadBowtie03** · 10-01-2006, 09:16 PM

he cant "chip" it... thats a term that has been carried over from OBD 1 computers in cars... he probably got a tune "loaded" onto the stock ecm. You wont be able to see anything different than stock.

**TLfuRy** · 10-02-2006, 06:11 AM

Originally Posted by BadBowtie03

he cant "chip" it... thats a term that has been carried over from OBD 1 computers in cars... he probably got a tune "loaded" onto the stock ecm. You wont be able to see anything different than stock.

Yeah I noticed that once I got in there and looked at it. If I wanted to have a new tune done, does it matter that it may already have a tune done? I guess what I'm asking is, is a tune absolute or is it relative to the existing settings? I went through all the paperwork and I can't find any info regarding a tune but I know he said he had something like that done ("chip it" may not have been what he said).

**06Silverado5.3L** · 10-02-2006, 01:47 PM

Originally Posted by TLfuRy

Yeah I noticed that once I got in there and looked at it. If I wanted to have a new tune done, does it matter that it may already have a tune done? I guess what I'm asking is, is a tune absolute or is it relative to the existing settings? I went through all the paperwork and I can't find any info regarding a tune but I know he said he had something like that done ("chip it" may not have been what he said).

If he has a tune in it now, your new tune will overwrite it.