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My 2016 Sierra 2500HD has 176,000 miles on it already and recently started eating parts. The latest part to fail was the reductant tank heater (DEF Heater). Upon cold start the check engine light came on with code P21DD. After a little reading I learned that this can result in “Limp Mode”. I was in the middle of nowhere in Northern Wyoming. Not cool! I drove down to Denver and replaced it that week. I shot this video of the repair.....
Bad Ground Somewhere
imperialbowtie09 posted a topic in 1999-2013 Silverado & Sierra 1500I was recently wiring an aftermarket switch and the terminals got bent and the positive and ground leads made contact and after several sparks the visor lights went out, left brake light and blinker will not function, and left side windows (front and back) stopped working. There’s no power getting to it at all. Also when it’s dark and the auto sensor turns the lights on, when I apply the brake the instrument cluster backlight cuts off and lights up again when i let off the brake. Total electrical screw up and i found out that this is causing a serious issue. Started smelling burning rubber and metal both through the air vents and outside the truck while standing by it. I later found out it’s shorting and getting severely hot around the right side of the mega fuse connected to the battery. So bad that it’s melted the plastic on the fuse and the fuse mount, rubber around the ends of the wire is melted and the bolts have become brittle. I’ve since replaced the fuse, need to replace the fuse mount. Still need to find where the ground is. Here’s the tricky part, tested the continuity of all fuses inside the cab and under the hood. MOST fuses in the cab ARE NOT even getting power, yet some are. None of the fuses are burnt or blown in both locations. Under the hood, some are not getting power but most are. I’m not savvy enough to know what the issue is but my thoughts are the problem lies between the battery and the fuse boxes. Maybe a burnt wire causing the ground? Bad wires? I have no clue...can anyone help? Any ideas, solutions, has anyone dealt with this? Also the lock and unlock will not work, yet you can hear the relay clicking when you press the button on the front doors and on the key fob. The lights blink, and even the alarm sounds if a door is opened but they do not lock or unlock. Thanks in advance! P.S. this is causing the engine to cut off due to the wires connected to the mega fuse losing contact. As i drive, with enough rattle they lose contact, and I lose power and eventually the engine cuts off. I have to jump it off constantly and pray that I make it where i’m going. It rattles back in contact and then back out. So I need to fix this quick, it’s killing my battery and straining my alternator.