Get Your Truck Back on the Road, Fast.
Is your dependable GMC Sierra suddenly running rough, shifting poorly, or refusing to start? A failing Powertrain Control Module (PCM) can bring your workhorse to a grinding halt, costing you time and money. This isn’t just an inconvenience; it’s a roadblock to getting the job done. We offer the definitive solution: a professionally programmed PCM, flashed with the latest GM software specifically for your truck’s VIN. This is the direct-fit, reliable fix you need to restore performance and clear that frustrating check engine light for good.
Common Symptoms of a Failing PCM & Your Direct Solution
If you’re experiencing any of the issues below, a faulty computer is the likely culprit. This module is the solution for a wide range of problems, including:
- Persistent Check Engine Light (CEL)
- Diagnostic Trouble Codes (DTCs) related to the processor, like P0600-P0606
- Rough or erratic engine idle
- Poor fuel economy
- Harsh or incorrect transmission shifting
- Engine stalling or no-start conditions
- Communication errors with diagnostic scan tools
Instead of wrestling with a used module from a junkyard or paying steep dealership prices for programming, our 1999-2000 GMC Sierra 1500 PCM arrives at your door ready for installation. It’s the most efficient way to get your vehicle running right again.
Features & Benefits
- ✔ VIN-Specific Programming: We flash the module with your truck’s exact VIN, ensuring it communicates perfectly with all other systems for a true plug-and-play installation. No expensive dealer visit required.
- ✔ Latest GM Software Updates: Your PCM comes loaded with the newest factory software, which often corrects earlier bugs and improves engine performance, fuel efficiency, and transmission logic.
- ✔ Comprehensive System Compatibility: This unit is a direct replacement for multiple part numbers, including 16263494 and 16265035, covering a wide array of GM trucks, vans, and SUVs from this era.
- ✔ Rigorously Inspected: Each module is thoroughly inspected and tested to ensure it meets strict quality standards, giving you long-term reliability you can count on.
An Expert’s Note on Diagnostics
“Over my 20 years under the hood, I’ve seen countless owners chase their tails replacing sensors and transmission solenoids, only to find the root cause was the PCM all along. A failing computer can send out false signals, making other good parts seem faulty. By starting with a correctly programmed 1999-2000 GMC Sierra 1500 PCM, you’re not just replacing a part; you’re eliminating guesswork and saving yourself from expensive misdiagnoses. It’s the smart, foundational repair that ensures the rest of your systems operate as designed.”
Take control of your repair. This module is the critical component that serves as the ‘brain’ for your truck’s engine and transmission. Installing our pre-programmed 1999-2000 GMC Sierra 1500 PCM is the most effective way to restore the dependable performance your work and life demand.
Frequently Asked Questions
What is the difference between a PCM and an ECM?
ECM (Engine Control Module) and PCM (Powertrain Control Module) are often used interchangeably. A PCM controls both the engine and the transmission, which is standard for most vehicles like your Sierra. An ECM typically only controls engine functions. For this application, the terms refer to the same part.
Do I need to do anything after installing this module?
Because this unit is pre-programmed to your VIN, it is designed for a plug-and-play installation. In some cases, a CASE (Crankshaft Angle Sensor Error) relearn procedure may be required, which can be performed with most professional-grade scan tools. This is a simple procedure that helps the engine run its smoothest.
How do I provide my VIN?
After you complete your purchase, we will contact you for your 17-digit Vehicle Identification Number (VIN). We cannot program and ship your module without it. You can typically find your VIN on the driver’s side dashboard (visible through the windshield) or on the driver’s side door jamb sticker.
Will this fix my check engine light?
If the check engine light is on due to an internal fault within the original PCM, then yes, this part will resolve the issue and allow the light to be cleared. However, if the light is on due to a separate issue (like a bad sensor or wiring problem), that issue will still need to be repaired.
What if my truck has modifications?
This module is programmed with standard factory software from GM. It is designed for vehicles with original factory equipment and specifications. It is not intended for vehicles with significant performance modifications such as non-factory camshafts, forced induction, or altered fuel systems.