Error messages not related "low coolant level" "park assist error" "trailer TPMS issue"

[Ryno81]

Hello all,

first time posting, i searched and couldn't find the info I needed. Recently my 2021 Sierra 3500HD AT4 started showing errors/codes on the dash. I am getting a low coolant level error with no issue with the coolant level, I have a service trailer TPMS error without a trailer hooked up and never having the trailer tpms active, and a park assist error. Dealer says they are unable to see anything wrong other than maybe a park assist sensor in the rear. I changed the park assist on the left rear as they said and nothing changes. A few days ago my wife hit a Utah pothole and the TPMS activated for the truck, but nothing was wrong, and the warning went away after a few minutes. 

 

Has anyone had similar issues? The dealer wants $700 to change out the park assist sensors but it is an easy job to do yourself. This all happened within 2 months of going outside of bumper to bumper warranty, but drivetrain warranty is still intact. Any information is greatly appreciated!

Edited June 12, 2024 by Ryno81

[newdude]

Coolant level sensor but coolant level is good = Needs a new tank because the coolant level sensor is likely faulty.

 

As for the rest, get a good code reader that can scan and talk to all vehicle modules.  BlueDriver or OBDMXLink are two good options.  

[Ryno81]

Shouldn't the dealer have been able to see what the error was? or are they that incapable?

 

[newdude]

On 6/12/2024 at 6:16 PM, Ryno81 said:

Shouldn't the dealer have been able to see what the error was? or are they that incapable?

 

 

 

Assuming there were codes stored in history, yes they would have been able to scan for codes system wide.  

Edited June 14, 2024 by newdude