CEL keeps coming on, but no codes found... [Archive] - Diesel Place : Chevrolet and GMC Diesel Truck Forums

: CEL keeps coming on, but no codes found...


flyin99
07-30-2009, 08:22 PM
Where to look now? Truck is an 06 LBZ....all stock. New fuel filter and filled up 4 days ago.....just started coming on while ago. Cleared it off with EFI, but after the second time truck was started, it came back on. I checked it again with the handheld, but no DTC's found, it says......cleared it again and off I went......came back on the next time truck was started. It runs absolutely fine, but the light is annoying......Thoughts?:)

GMC2500HD
07-30-2009, 08:38 PM
Besides EFI what have you done to the truck?

flyin99
07-30-2009, 10:08 PM
EFI is not on this truck. It is absolutely bone stock. I was just using the scanner to check and clear codes.