Hello,So we had to replace the heads on my 2009 Chevy duramax. It had previously had DPF delete and efi 5 position tune. It goes into limp mode randomly now. Could the tune be messed up and it need to be retuned?
What codes are set when the truck goes into limp mode? Is the "reduced power" warning actually on the dash or is the vehicle just sluggish?
I get dash warning and the truck actually reduced power. Dealership couldn’t give me any info because of the delete. They said their diagnostics won’t work.