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How to or able to reset Permanent DTC

Adam Guillod
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Adam Guillod New Member

Adam Guillod

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Posted

I have a 2020 Silverado lm2 with an engine light on. Codes are u 01b0 and u1345.  I’ve tried resetting it with scan tool and disconnecting the battery for a couple hours but code does not go away. Scan tool says they are permanent codes and is unable to reset. Code came on after I popped the hood when the truck was running on remote start. Truck shut off right away when I popped the hood and CEL came on, on next start up. Went to dealership thought it would be under warranty apparently not. Dealership did not find any issues but wanted to change out the battery sensor but I chose to fix that myself. Codes still on. So id like to clear the codes to see if codes will come back before I return to the mechanic. Thanks for any help in advance. 

ember1205 Senior Enthusiast

ember1205

Posted
Posted

This is one of those things that is all about the details...

 

Sensors will detect issues that set DTC's. All DTC's can be cleared. Certain DTC's will ALSO set a PDTC (sort of like a "copy" of itself) and PDTC's can NOT be cleared. Period.

 

PDTC's are generally (only?) related to emissions-related problems and exist in vehicles from 2010 and newer specifically to ensure that issues related to emissions can not be "gotten around" through code clearing only - you HAVE to repair the underlying issue that caused the original DTC in the first place, clear the DTC, and then just drive the vehicle. Generally, you need to plan on at least 10-15 drive cycles and at least 200 miles of driving -after- clearing the DTC in order for the PDTC to erase itself.

 

Issue -> sets DTC -> illuminates CEL

Clearing DTC -> CEL turned off

If PDTC was set, it will remain until the drive cycles and mileage required to clear it have been met.

 

Clearing a DTC should be done with car on and engine off. Once cleared, if the CEL returns, you still have an issue.

 

Hope that helps...

ember1205 Senior Enthusiast

ember1205

Posted
Posted
23 minutes ago, Mshawn said:

Also the type of scanner you use. A lot of cheap Chinese made scanner will not do it even thou they say it’s cleared. 

 

No scanner can clear the Permanent DTC, only the DTC itself. DTC's that begin with a "U" are network-related, and I'm pretty sure -ONLY- certain codes within the Powertrain category (those that start with "p") have the potential to be permanent codes.


With regard to permanent codes, they will remain in the ECU until "enough" drive cycles and mileage are recorded once the underlying conditions are remedied AND the DTC has been cleared.

newdude Senior Enthusiast

newdude

Posted
Posted
On 12/19/2023 at 8:08 PM, Adam Guillod said:

I have a 2020 Silverado lm2 with an engine light on. Codes are u 01b0 and u1345.  I’ve tried resetting it with scan tool and disconnecting the battery for a couple hours but code does not go away. Scan tool says they are permanent codes and is unable to reset. Code came on after I popped the hood when the truck was running on remote start. Truck shut off right away when I popped the hood and CEL came on, on next start up. Went to dealership thought it would be under warranty apparently not. Dealership did not find any issues but wanted to change out the battery sensor but I chose to fix that myself. Codes still on. So id like to clear the codes to see if codes will come back before I return to the mechanic. Thanks for any help in advance. 

 

 

Replace the grille shutter or inspect the wiring for damage.  

 

21-NA-077 1..5 (nhtsa.gov)

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