Jump to content

DEF gauge reads empty. NOX malfunction. Derate mode.


Darcy1

Recommended Posts

Hello everyone I'm new to this forum and have a problem with a 2013 GU813. The truck is in derate mode. DEF gauge reads empty, tank is full. Engine light is on. Code NOX malfunction data valid but higher than normal. I suspect the DEF level sending unit. Any tests to perform to validate my prognosis?

Thanks

Link to comment
Share on other sites

Has anyone worked on the batteries? The ACM (aftertreatment control module) power wire goes straight to the batteries. Its just a small wire terminal. Ive seen 3 trucks that had the batteries replaced and the terminal was left off. As a result the truck was in derate and the DEF tank read empty.

This is the only idea I have.

Link to comment
Share on other sites

Thanks for the tips people. Problem resolved. I found a broken power wire in the ACM harness about 2ft in front of the battery box on the inside of the frame rail. I'm surprised the fuse didn't blow as it was the positive rubbed through on a cross member. Repaired wire no longer in derate. I still had to clear the engine light with VCADS PRO.

Thanks again everyone.

Link to comment
Share on other sites

  • 1 year later...
  • 4 years later...
On 9/15/2015 at 1:49 PM, Challenger said:

Has anyone worked on the batteries? The ACM (aftertreatment control module) power wire goes straight to the batteries. Its just a small wire terminal. Ive seen 3 trucks that had the batteries replaced and the terminal was left off. As a result the truck was in derate and the DEF tank read empty.

This is the only idea I have.

I got same problem but I didn’t find acm powar wire . Can anyone help  me about this 

Link to comment
Share on other sites

On 9/15/2015 at 4:46 PM, Darcy1 said:

Thanks for the tips people. Problem resolved. I found a broken power wire in the ACM harness about 2ft in front of the battery box on the inside of the frame rail. I'm surprised the fuse didn't blow as it was the positive rubbed through on a cross member. Repaired wire no longer in derate. I still had to clear the engine light with VCADS PRO.

Thanks again everyone.

Is that wire directly connect with batteries 

thanks

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...