02 Yukon slt 5.3

[omarrrr239]

Out of the blue my Yukon doesn’t turn after cycling the keys off and on. When I check under the hood I hear a clicking noise in the fuse box when I try to start the truck. I know for sure that there’s power from the key telling the truck to turn on. The fuel pump is working (because I hear it prime the lines)but no spark. I have to tap on every fuses and relay because it happens when I’m not near any tools or at home. I know for sure it’s not the battery or any fuel related but somewhere from spark to starter relay or fuse. I wanna see if anyone out there who have a 02 Yukon slt 5.3 or worked with one with the same issue and if it’s a known issues with the truck. It’s been going on for a while but I haven’t had the chance to check it out.

 

[B-train]

Does it actually crank over? Or does it just click in the fuse box?

 

[omarrrr239]

Does it actually crank over? Or does it just click in the fuse box?

It crank over after I tap on the fuses and the relay. It happens out of nowhere. When it happens I check the fuse box n when I turn the key over it makes a clicking noise when I turn the key over to run.

 

[B-train]

Then I'd replace the crank/run relay

 

[OR VietVet]

As @B-train said. In a pinch, lots of times a duplicate relay is the same and can be transferred in the relay box to get home. There can be systems in the relay box that all use the same relay.

 

[yukon06]

does it start after you tap on the fuses / relay?
if it does then possibly the relay but also maybe corroded connections?