How to Replace Both Headlight Bulbs on a 2018 GMC Sierra 1500 (Low & High Beam)
Step-by-step bulb replacement with tools list, safety tips, and halogen vs HID/LED identification
How to Replace Both Headlight Bulbs on a 2018 GMC Sierra 1500 (Low & High Beam)
Step-by-step bulb replacement with tools list, safety tips, and halogen vs HID/LED identification
🔧 Sierra 1500 - Headlight Bulb Replacement
On your Sierra 1500, the exact steps and bulb type depend on whether you have standard halogen bulbs or factory HID/LED headlights. Once we confirm that, I’ll give you the correct, trim-accurate steps to replace both sides without breaking clips or contaminating the new bulbs.
Difficulty Level: Beginner | Estimated Time: 0.5-1.0 hours
⚠️ Safety & Precautions
- ⚠️ Turn lights OFF and let bulbs cool before touching.
- ⚠️ Wear gloves and don’t touch halogen bulb glass with bare fingers (oil shortens bulb life).
- ⚠️ If you have HID/LED, do not unplug components with the lights on (high voltage risk on HID systems).
🔧 Required Tools
You'll need the following tools for this repair:
- Nitrile gloves
- Safety glasses
- Trim clip removal tool
- Flat-blade screwdriver
- 7mm socket
- 10mm socket
- 1/4" ratchet
- 6" extension
- Flashlight
🔩 Required Parts
HowToo sells all the parts you need for this repair:
- Headlight bulbs - Qty: 2
📋 Before You Begin
- Park on level ground, shift to Park, and set the parking brake.
- Turn the headlight switch OFF and remove the key.
- Open the hood and use a flashlight to look behind the headlight housing.
🔨 Step-by-Step Instructions
Before I lock in the exact steps and bulb part, answer these 2 quick questions:
- Look at the headlight: is it a regular halogen reflector/projector with a yellowish bulb, or does it say HID/Xenon and look very bright white/blue, or is it a sealed LED unit (no replaceable bulb)?
- Are you replacing the low beams, the high beams, or both?
Reply with “halogen low+high” or “HID low only”, etc.
✅ After Repair
- Turn headlights ON and confirm both sides work on the setting you replaced.
- Check high beams, low beams, and turn signals to ensure nothing was unplugged by accident.
- If one side doesn’t work, re-seat the electrical connector and confirm the bulb is fully locked in.
💰 DIY vs Shop Cost
Shop Cost: $80-$250 (parts + labor)
DIY Cost: $20-$160 (parts only)
You Save: $60-$90 by doing it yourself!
Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 0.5-1.0 hours.
🎯 Ready to get started?
HowToo makes it easy: same-day/2-day shipping on every part, plus all the tools and specialty tools you need! Check out the parts and tools sections below to add everything to your cart.


















