A bad relay located on the circuit board of 2014-19 GM trucks is one of the reasons you may need to replace your 2014 through 2019 Chevy Silverado or GMC Sierra's "Engine Wiring Harness Junction Block". This part is also commonly referred to as the "Fuse Box". When researching this part please reference GM part number 84303175. Because the relays are attached to the circuit board, the easiest way to fix a bad relay may be to purchase a new Engine Wiring Harness Junction Block from your local Chevy or GMC dealer and install it yourself.

This is an extremely easy fix for a very annoying issue. The unfortunate thing about this is that the Engine Wiring Harness Junction Block (GM Part Number: 84303175) costs approximately $260.00 at the dealership. So, this extremely easy fix is also an extremely expensive fix. However, if you follow the steps in this video, you can have your truck back to normal in no time at all.

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Engine Wiring Harness Junction Block - GM (84303175)
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