158 MPH Max speed?

[bradendraper]

I recently bought an 2017 L5P that had been deleted but possibly not done correctly. i have a service emission system, see owners manual code come up but no check engine light. it also says 70 miles until max speed of 158 MPH. Yes 158. local shop says its a tuning issue and will have to be "un-deleted", anyone dealt with this before?

 

[08lmm72mm]

Is the emissions system still intact or has it been removed ? I doubt you'll get much help here with delete stuff.

 

[clding]

Did you ever find a resolution? I have a 2018 3500 with the same issue.

 

[gmduramax]

If it says xx miles until max speed of xx mph that is an issue with the DEF system. It’s very common to have a communication issue at the DEF module.

Also once you get that message, it is very hard to get it to go away since the implementation of “permanent” codes

 

[2004LB7]

If it says xx miles until max speed of xx mph that is an issue with the DEF system. It’s very common to have a communication issue at the DEF module.

Also once you get that message, it is very hard to get it to go away since the implementation of “permanent” codes

Re-uploading the tune seems to be the only way to clear them short of a successful drive test

 

[Chevy1925]

In his case, he may have to re-hook a full def tank back up as well so the truck actually sees that. I know of ways to clear it when not deleted, different story when deleted

 

[kaylabryn]

Curious if you wouldn't mind elaborating on this? I had a friend recently that had a "Permanent" DEF code on his 2021 and was trying to get home to Yuma without driving 55 the whole way or less. But I couldn't find any info about resetting or??