1996-2000 GMC K2500 Hazard Warning and Turn Signal Flasher Guide
Fixing the common issue where your turn signal activates the hazard lights on your GMT400 truck.
- The most common symptom of failure is the hazard lights flashing when you only select a turn signal.
- This is a combination flasher that controls both turn signals and hazards.
- The original GM part is known to fail; a quality aftermarket part like one from Standard Ignition is a reliable and cost-effective fix.
- Replacement is very easy for a DIYer, requiring basic tools and about 30 minutes.
Is Your K2500 Flasher Failing?
A failing hazard flasher in the 1996-2000 GMC K2500 often presents with very specific, and sometimes confusing, symptoms. The most common and well-documented complaint from owners is that activating a turn signal, particularly the left one, causes all four hazard lights to flash instead. Other times, the turn signals might not blink at all and stay on as a solid light, or they may fail to light up entirely. These problems can be intermittent, working correctly one moment and failing the next.
A Known GM Issue
This is a widely recognized failure point on this generation of GM trucks. The original equipment (OEM) flasher units are known to fail over time. Due to the high failure rate and higher cost of a new OEM part, a quality aftermarket replacement is often considered a better and more economical solution.
Choosing the Right Aftermarket Flasher
When shopping for a new flasher, you need a reliable part that will restore normal function without frequent replacement. The brand available for this application is Standard Ignition.
- Standard Ignition (Standard Motor Products): This is a well-regarded brand in the aftermarket industry. They manufacture parts to high-quality standards (TS16949 and ISO9001 certified) and often use durable components like brass or copper contacts for extended wear resistance. For a part like this, where the OEM unit has known weaknesses, a Standard Ignition flasher is a solid and dependable choice.
Cost of Replacing Your Hazard Flasher
Replacing the hazard flasher is an inexpensive repair, especially if you do it yourself. The part itself is affordable, and the labor is minimal.
| Item | Estimated Cost |
|---|---|
| New Aftermarket Flasher | $29.05 |
| Shop Labor | $60 - $120 |
| DIY Total | $29.05 |
| Shop Total | $89 - $149 |
DIY Installation is Easy
This is a great project for a beginner. The flasher is located under the driver's side dashboard behind the lower trim panel (the knee bolster). You will need a 7mm socket and a screwdriver. The process involves removing the dash bezel and the lower panel to access the old flasher, which simply unplugs. The new one plugs directly into the same socket. The entire job can typically be done in under 30 minutes.
Frequently Asked Questions
Where is the hazard flasher located on a 1998 GMC K2500?
The location is the same for all 1996-2000 models. It is a rectangular module plugged into a fuse panel or junction block located under the driver's side dashboard, behind the lower dash panel.
My turn signals work, but my hazards don't. Is it the flasher?
It could be, but you should check other things first. While the flasher controls both, the systems use different fuses. Check your fuse box for a blown hazard light fuse first. If the fuse is good, the problem could also be with the hazard switch itself, which is part of the multifunction switch assembly on the steering column.
Is this the same part as the turn signal flasher?
Yes. For the 1996-2000 GMC K2500, a single combination flasher module controls both the turn signals and the hazard warning lights.
Are there any recalls for the hazard flasher on my truck?
No, searches of the National Highway Traffic Safety Administration (NHTSA) database did not show any open recalls for the hazard warning flasher on the 1996-2000 GMC K2500.
Technical Specifications
OEM Part Numbers: 15764135
Combination Turn Signal & Hazard Flasher Module
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- GMC K2500: