Tail light FIX 2015 + Yukon, Tahoe, Suburban Denali, XL GM, Chevrolet

Introduction

This tutorial provides a step-by-step guide for fixing the common tail light issues found in 2015+ GMC Yukon, Tahoe, Suburban, and Denali models. By following these instructions, you can save significantly on repair costs by performing the fix yourself.

Step 1: Remove the Tail Light Panel

• Use a flathead screwdriver to pry against the edges of the tail light panel.
• Pull the panel straight back to detach it from the clips. There are three clips that hold it in place.

Step 2: Unscrew the Tail Light Assembly

• Use a T-15 Torx screwdriver to remove the two screws holding the tail light assembly.
• Gently pull the entire assembly outward.

Step 3: Disconnect the Wiring Harness

• Locate the metal clips securing the wiring harness. Use a screwdriver to pry them off gently.
• Remove the reverse bulb by twisting it out.
• Pinch and detach the regular tail light bulb from the assembly.

Step 4: Prepare for Circuit Repair

• With the tail light assembly on a workbench, identify the area to cut into the harness.
• Count down about four points down from the top and make a note of the lower connection point, where issues often occur.

Step 5: Cut into the Back of the Harness

• Use a heat gun to heat a Swiss Army knife, avoiding melting any plastic components.
• Make small incisions to cut through the harness. Be careful to cut only through the outer layer without damaging the internal circuit board.
• Create vertical and horizontal incisions to open a square section of the harness.

Step 6: Inspect for Damage

• Look for hairline cracks in the circuit board. Test the connection by slightly touching the cracks and observing if the light turns off.
• Identify the areas that need soldering, particularly where the connections are broken.

Step 7: Solder the Connections

• Heat the metal around the crack, not the solder itself. Once hot, apply a glob of solder to bridge the crack.
• Use a piece of copper wire to reinforce the connection, ensuring it's properly soldered at both ends.
• Ensure that no solder bridges between the wrong connections, which could cause malfunction.

Step 8: Test the Repair

• Once soldered, reconnect the assembly to check if the lights function correctly.
• Watch for flickering or loose connections; make adjustments if necessary.

Step 9: Temporary Seal the Repair

• Use electrical tape to temporarily cover the repaired area. This will protect against dirt and moisture while you test the repairs.

Step 10: Reassemble the Tail Light Assembly

• Reinsert the wiring harness and bulbs back into the assembly.
• Secure the assembly by tightening the two T-15 screws.
• Finally, reattach the tail light panel by lining up the clips and pressing it back into place.

Conclusion

Following these steps will help you successfully repair the tail light issues in your GM vehicle, saving you money on professional repairs. After testing the repair, consider applying a more permanent seal to protect the circuit from future damage. If issues persist, further inspection may be warranted.