just do a search for that code on here, there are tons of threads on it that can help you

 

I tried it here http://www.dieselplace.com/forum/showthread.php?t=226482, but it was not a valid code.

 

Hi guys,

New to the forum and hoping someone might have some suggestions for me. I have a 2004.5 lly and it's throwing a code of P0670. I looked it up and it appears to be listed as "Glow Plug Module Control Circuit."

However, I've been unable to find a troubleshooting guide to help me determine the exact cause of the code.

Anyone have any experience with this code, or perhaps can suggest a guide to troubleshooting it?

Thanks in advance!

Having the same issue. I searched and didn't find a way to trouble shoot the glow plug module.

thanks

 

http://www.dieselplace.com/forum/showthread.php?t=387477&highlight=P0670

Read this thread, goes through on how to troubleshoot the glow plugs, and if the module is working.

The P0670 by itself normally means that you need to replace the module.

 

http://www.dieselplace.com/forum/showthread.php?t=376114

try this...

 

I had this come come up on me about two years ago. Only solution is a trip to the dealer for a new module.