2004 Denali wiring

[Greggo63]

I’ve got a 2004 Yukon Denali and I’m wondering, is it common for them to have wiring problems?
I’ve got idiot lights coming on randomly!
For instance, the coolant level light came on and its full!
I’ve had some other phantom issues happen also!

 

[Cbncanada]

You may have a loose ground somewhere.

 

[Big Mama]

Welcome to the forum from Virginia. They’re not known for it. As stated, these rigs have grounding issues. I’m not sure how many you have but I’d start with the battery and go to the others. If you see corrosion at the end it goes way up the cable.

 

[iddqd]

Here is ur wiring diagram:

Splice S102 is located in the Engine Harness Approximately 14 cm (5.51 in) before the Manifold Absolute Pressure (MAP) Sensor Breakout. Ground G104 is shown on the second pic.