2010 KW possible bad cecu

[Bigmack713]

(06-23-2025 )trucklogger2 Wrote:  To add to that now that I remember more there was a $2 relay burnt on the control board in the cecu which you can check. I took it to a retired electrical engineer who found it.

Thank you for pm'ing me so promptly. With the part number you gave me (p21-1019-303)I looked up the parts diagram. And yes this little box controls everything that is wrong with my truck currently. I'm in the process of checking for corrosion and or broken wires. I don't want to jump to conclusions but this might be the issue. I've isolated it by unplugging multifunction switch headlight harnesses and rocker switches yet the single turn signal light stays on on the back of the truck.