Get Your Heavy-Duty GMC Back on the Job
When your 1998-1999 GMC 3500 starts acting upโstalling, shifting erratically, or refusing to startโthe problem often points to a failing Powertrain Control Module (PCM). A down truck means lost time and lost money. This isn’t just an inconvenience; it’s a roadblock to getting your work done. We provide the direct, reliable solution to get your truck’s essential systems back online, fast. This module is the central command for your engine and transmission, and we deliver it ready for immediate installation, programmed specifically for your vehicle.
Common Failure Symptoms & Your Direct-Fit Solution
A failing PCM can cause a wide range of frustrating issues that can be difficult to diagnose. If you’re experiencing any of the following, a faulty module is the likely culprit:
- Engine stalling or random misfires
- Harsh or unpredictable transmission shifting
- Complete no-start condition with power to all other systems
- Check Engine Light with communication error codes (like P0601, P0605)
- Poor fuel economy or a sudden loss of power
- Inaccurate or erratic gauge readings
This replacement module is the definitive fix for these problems. We take the guesswork out of the repair by pre-programming the unit using your truck’s specific Vehicle Identification Number (VIN). This ensures that all factory settings for your engine, transmission, and accessories are perfectly matched, restoring the performance and reliability you depend on. The 1999 GMC 3500 PCM 09366810 is your path to a straightforward and successful repair.
Features & Benefits
- โ VIN-Programmed & Ready to Install: We flash the module with the latest GM software updates specific to your truck. This eliminates the need for expensive dealership programming or special tools.
- โ Restored Drivability: Corrects rough idling, poor acceleration, and harsh shifting by restoring precise control over your engine and transmission.
- โ Plug-and-Play Design: Engineered to be a direct replacement for the original unit, ensuring a perfect fit and seamless connection with your existing wiring harness.
- โ Built for Durability: Each module is thoroughly inspected and tested to withstand the demanding conditions of a heavy-duty work truck environment.
- โ Peace of Mind Included: This unit is backed by our one-year replacement warranty.
An Expert’s Note on VIN Programming
“For these late-90s GM trucks, VIN-specific programming isn’t just a convenienceโit’s critical. The PCM for a 5.7L V8 with a 4L80E transmission has entirely different fuel maps and shift point tables than one for a 7.4L V8. A generic or mismatched module will cause persistent performance issues. By flashing this unit to your exact VIN, we ensure it knows every detail of your truck’s original configuration, from the axle ratio to the tire size. This is the only way to guarantee the smooth, reliable operation your truck had when it left the factory.”
Don’t let a faulty computer sideline your essential vehicle. This is the most efficient and reliable way to solve complex electronic issues and get your truck running properly again. By providing a module that is a direct replacement for part number 09366810, we ensure you get the right component for the job. Order your 1999 GMC 3500 PCM 09366810 and get back to work with confidence.
Frequently Asked Questions
Do I need to do any programming after installation?
No. This module arrives fully programmed to your vehicle’s VIN. In some cases, a simple security relearn procedure (often called a ‘key cycle relearn’) may be required, which takes about 10-15 minutes and does not require any special tools. Instructions are readily available online for this process.
How do I provide my vehicle’s VIN?
After you complete your purchase, you can add your VIN to the order notes or simply reply to your order confirmation email with the 17-digit VIN. We cannot ship the module until we have this information to program it correctly.
Is this compatible with other OEM part numbers?
Yes, this module is a direct replacement for several part numbers, including 16250279, 09366810, and 09355699. Please check the fitment list to confirm it matches your specific make and model.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls the electronic solenoids inside the transmission. A failing PCM is a very common cause of harsh shifting, delayed engagement, or being stuck in one gear (limp mode) on these GM trucks. If you have transmission-related codes, replacing the PCM is often the solution.
Where is the PCM located on my 1999 GMC 3500?
On most 1998-1999 GMC and Chevrolet full-size trucks, the PCM is located in the engine compartment on the driver’s side (LH side), typically near the battery or mounted to the inner fender.