New to Forums and here...just purchased a 2007 LT and can't clear code P0604. Was looking at getting a new ECM but when I was going to order was told computer is for a 2.4 and the vin is 2.2.
So question is how can I tell if someone swapped motors at some point or did they just purchase an incorrect ECM and just lived with the light?
Can you visibly see a difference between the two motors?
Thanks!

 

2007 2.4 is a VVT motor so it would have the camshaft actuator solenoids visible on the front, top of the valve cover.
2007 2.2 is NOT a VVT motor so it won't have those.

FYI. Code P0604 pertains to the TCM not the ECM.

 

Have a read, in this ....

https://www.obd-codes.com/p0604

 

Hmm. I got my reference from ChevyMgr's sticky on Diagnostic codes. Not sure what to think after reading Oldblues link.
C'mon Donbrew ! Help us out here.

Here's ChevyMgr's info.
P0601 Control Module Read Only Memory (ROM)
Transmission Control Module (TCM) Read Only Memory (ROM)
P0602 Control Module Not Programmed
Transmission Control Module (TCM) Not Programmed
P0603 Control Module Long Term Memory Reset
Transmission Control Module (TCM) Long Term Memory Reset
P0604 Control Module Random Access Memory (RAM)
Transmission Control Module (TCM) Random Access Memory (RAM)
P0606 Control Module Internal Performance
P0607 Control Module Performance

 

I’m thinking, a loose ground wire , or loose pins or wires in the connector to the ECM or try the TCM . Can’t hurt to clean and regrease , with dielectric grease.
remove the battery ground cable while you perform this task.
Don’t forget to put a folded towel over the hatch latch , it’s no fun crawling in to open the hatch.

 

I don't see a disagreement. I would be looking at relays and fuses long before replacing computers. It actually applies to both ECM & TCM

 

Thank you, does look like 2.2.
Have tried grounding both computers housings directly to ground with no change. Live data on the Autel code reader seems like communication is normal.
Called to try ordering a computer at store.allcomputerresources.com when I gave them the ViN and the computer service number he stated the computer number was for a 2.4 liter...
That is why I was reaching out to the experts here...

 

Which one,ECM or TCM? The code could be for either one. Who is going to program it for you?

If "VVT" is printed in large letters on the Valve cover it is a 2.4L.

If the 8th digit of your VIN is B it was built with a 2.4l. If it is F it was built with a 2.2L.

Do yourself a favor and read the link Oldblue provided.

 

Oldblue - that picture doesn't show the area where the solenoids are located. They are under the cover, to the right of the picture.