Fits (GMT900):
- 2007-2014 GMC Yukon, Yukon XL and Denali; 2008-2013 Yukon Hybrid
- 2007-2014 Chevrolet Tahoe
- 2007-2014 Chevrolet Suburban
- 2007-2014 Cadillac Escalade and Escalade ESV; 2009-2013 Escalade Hybrid
Read This First: Two Harnesses Are in the Box
The set contains the left and right lamps plus two adapter harness sets — one with a load resistor and one without. Which one your vehicle takes depends on how its body control module watches the rear lamps, and it differs by brand:
- GMC Yukon, Yukon XL and Denali — use the set with the load resistor.
- Cadillac Escalade and Escalade ESV — use the set without a resistor.
- Chevrolet Tahoe and Suburban — fit the set without a resistor first and run the turn-signal test. If you get hyperflash or a bulb-out warning, swap to the resistor set. Both are in the box, so this costs nothing but a few minutes.
If you have also done a 2015-2020 truck, do not carry the rule over — the resistor assignment is different on that generation.
Before You Start
- Park on level ground, switch off, and disconnect the negative battery terminal while handling wiring.
- Use masking tape near painted edges around the liftgate opening.
- Do not put dielectric or weather-sealing grease on connectors or sockets.
- If a lamp does not move, stop and look for another fastener or locating pin.
- Load resistors run warm. If you end up on the resistor set, mount it away from plastic trim, wiring insulation and water paths.
Required Tools
- Trim removal tool
- Metric socket and ratchet set
- Phillips and flat screwdrivers
- Masking tape and clean microfiber towels
- Electrical tape and zip ties for the supplied harness
- A helper for brake light and turn signal testing
Part 1: Remove the Factory Tail Lights
Step 1: Open the Liftgate
Locate the lamp retainers.
Step 2: Support the Lamp
This is a tall lamp. Hold it while removing its fasteners so it does not drop against the paint on the way out.
Step 3: Pull It Straight Out
Release the locating pins by pulling in line with the lamp. Do not lever against a painted panel.
Step 4: Disconnect
Press the lock tab and pull on the connector body, not on the wires.
Step 5: Compare Before Fitting
Set the old and new lamp side by side and check the rear plug and the mounting points before committing to the swap.
Part 2: Install the New Tail Lights
Step 6: Fit the Adapter Harness
Connect the harness you chose above to the vehicle connector, then to the lamp. Confirm the lock tab seats fully. Set the unused harness aside — keep it, in case the test below sends you back to it.
Step 7: Seat the Lamp Evenly
Align the locating pins and check the body gaps along the full height of the lamp before tightening. Do not overtighten plastic mounting points.
Step 8: Test Before Closing Up
- Running lights on both sides.
- Brake lights, with a helper on the pedal.
- Left and right turn signals and hazards. The turn signal flashes — it does not sweep.
- Reverse lights where supported, with the vehicle safely in reverse and the parking brake on.
- Startup animation, once the road-light functions pass.
- Check for dashboard warnings, hyperflash or flicker.
If you see hyperflash or a bulb-out warning, you are on the wrong harness set. Swap to the other one and retest.
Common Issues and Solutions
Hyperflash or a bulb-out warning. Wrong harness set. Swap to the other set from the box and retest — this is the single most common issue on this vehicle and it is a two-minute fix.
The turn signal flashes instead of sweeping. That is the product. There is no sequential sweep on this lamp.
One lamp does not light. Recheck the harness connection at both ends, the related fuse and the battery connection.
One function does not work. Verify the connector is fully seated.
The lamp does not sit flush along its height. Check for a trapped harness and confirm every locating pin has seated — a tall lamp shows a gap at one end long before you notice it at the other.
Condensation inside the tail light. Temperature differences can cause light condensation, which is normal. Once the light has been on for a while and the internal temperature stabilizes, the moisture clears on its own. It does not affect brightness, performance, or lifespan.
