2010 KW possible bad cecu

[Bigmack713]

(06-23-2025 )trucklogger2 Wrote:  Cecu will be under cupholder
I took mine out as it was shutting itself off with the heat of summer.
So I looked at the three harnesses that plug into it for an obvious problem and found some green on power spade on cecu side, it’s the smaller square port closest to driver seat. I was also able to lift it a little higher off the abs module an secure it,and hasn’t shut off yet since.
Also the other module is behind dash for your other functions also changed that on my 2010 for your same reasons, I can send you a part number

I cleaned those two connectors with a small set of files that I had. There was a little bit of corrosion but not much.Can you send me the part number of the module you changed?

[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.

[Bigmack713]

(06-29-2025 )Bigmack713 Wrote:  

(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.

I open up the module and it was full of corrosion and some rust. Some of the components were corroded or missing. Obvious signs of water damage.

[Bigmack713]

Just wanted to update everyone.i changed the above mentioned module and all is working as it should

[Rawze]

(Yesterday )Bigmack713 Wrote:  Just wanted to update everyone.i changed the above mentioned module and all is working as it should

Thanks for the update. I am sure it will help someone in the future.

Now the next thing to pursue is how to prevent it from occurring again.