GMC K3500 Ignition Control Module Replacement Guide (1993-2000)
A complete guide to diagnosing and replacing the ignition control module on your GMT400 workhorse.
- The most common symptom of failure is the engine stalling when hot and restarting after it cools down.
- Before ordering, you must verify if your module is inside the distributor (TBI engines) or external (Vortec engines).
- Always apply the included thermal paste to the back of the new module to prevent it from overheating and failing.
- Choose a quality brand like Delphi or Standard Ignition for a reliable, long-lasting repair.
Is Your K3500 Stalling or Refusing to Start?
A failing ignition control module (ICM) is a common problem on 1993-2000 GMC K3500 trucks, often causing symptoms that appear suddenly. The most frequent complaint is the engine stalling after it has warmed up. The truck may run fine when cold, but once the engine bay heats up, the module overheats and fails, cutting spark and killing the engine. After it cools down for 15-30 minutes, it might start again, only to repeat the problem. Other signs include a crank-but-no-start condition, engine misfires, rough idling, and a Check Engine Light.
Common Ordering Mistake: Know Your Engine
The 1993-2000 period covers two different engine styles for the K3500, and the ignition module is in a different place for each. Ordering the wrong one is a common mistake.
- 1993-1995 (approx.) TBI Engines: On trucks with Throttle Body Injection (TBI), the ignition module is located inside the distributor. You must remove the distributor cap to access it.
- 1996-2000 (approx.) Vortec Engines: On the newer Vortec engines, the module is mounted externally on a metal bracket next to the ignition coil, typically on the driver's side of the engine.
Visually inspect your engine to confirm the location before you buy a new part.
Choosing the Right Aftermarket Ignition Module
For a part this critical, quality matters. While many brands exist, sticking with reputable names is your best bet for a lasting repair. Since original GM parts are becoming harder to find, a quality aftermarket part is a smart choice.
Delphi: Delphi was an original equipment (OE) manufacturer for General Motors, meaning they made the parts that went into your truck at the factory. Choosing a Delphi module is the closest you can get to the original part's quality and fit. They are engineered to meet or exceed GM's specifications for performance and durability.
Standard Ignition (SMP): Standard Motor Products is a well-respected aftermarket brand that has been around for decades. They offer a reliable alternative to OE parts and are a trusted choice for professional mechanics. They often provide a good balance of quality and price.
Pro Tip: Don't Forget the Thermal Paste!
Your new ignition module will come with a small packet of thermal grease. You MUST apply a thin, even layer to the metal back of the module before installation. This paste helps transfer heat to the mounting bracket or distributor base, acting as a heat sink. Skipping this step will cause the new module to overheat and fail in a very short time.
Ignition Control Module Cost for 1993-2000 GMC K3500
| Part Type | Estimated Cost |
|---|---|
| New Aftermarket (Delphi, Standard) | $79.96 - $138.79 |
| Shop Labor | $100 - $150 |
Frequently Asked Questions
Can a bad ignition coil damage the new module?
Yes. A failing ignition coil can have incorrect primary resistance, causing it to draw too much current and overload the ignition module, leading to premature failure. If your module has failed, it's wise to test the ignition coil with a multimeter to ensure it's within spec.
Is there a recall on the ignition module for my K3500?
No. While GM had major recalls for ignition switches and lock cylinders on other vehicles, these did not apply to the ignition control module on the 1993-2000 K3500. There are no active recalls for this specific part on your truck.
Can I test my old module before replacing it?
Testing can be tricky because they often fail when hot. Many auto parts stores have a bench tester for ignition modules. You can take your module to the store and have them test it. Ask them to run the test several times to see if it fails as it heats up.
What tools do I need for the replacement?
The job requires basic hand tools. For most models, you will need a ratchet and a 5.5mm socket. You may also need a flathead screwdriver or an 8mm socket to remove parts of the air intake for better access on Vortec models.
Technical Specifications
OEM Part Numbers: 19245558 D1996A LX340
Controls ignition coil firing based on distributor signal. Requires thermal paste for heat dissipation.
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 K3500: