Get Your Truck Back to Work, Fast.
Is your reliable GM truck or van suddenly running rough, shifting poorly, or refusing to start? A failing Powertrain Control Module (PCM) can bring your work to a grinding halt, causing frustrating diagnostic dead-ends and costly downtime. This isn’t just an inconvenience; it’s a direct hit to your productivity. This replacement PCM is the definitive, hassle-free solution to get your vehicle’s brain back in perfect working order, restoring the power and dependability you count on every day.
Common Symptoms & Your Solution
If you’re experiencing any of the following issues, a faulty computer is the likely culprit:
- Persistent Check Engine Light (CEL) with communication codes (U-codes) or internal processor codes (P0600-P0606).
- Harsh or erratic automatic transmission shifting.
- Engine stalling, stumbling, or misfiring with no clear mechanical cause.
- Complete no-start condition where the engine cranks but won’t fire.
- Poor fuel economy and a noticeable loss of power.
This module is the answer. We take a quality, tested PCM and program it specifically to your vehicle’s VIN using the latest official GM software updates. This ensures that all factory-addressed bugs and performance improvements are loaded and ready to go. When you install our expertly prepared 1999 GMC 2500 PCM 16263494, you’re not just replacing a part; you’re restoring your vehicle’s core operational integrity.
Features & Tangible Benefits
- โ VIN-Specific Programming Included: We flash the module with your vehicle’s exact VIN before shipping. This means it arrives ready for installation, eliminating the need for an expensive trip to the dealership for programming.
- โ Loaded with Latest GM Software: Your engine and transmission will benefit from the most current calibrations, often improving idle quality, shift points, and overall efficiency beyond what your old module could offer.
- โ Direct-Fit OE Replacement: Guaranteed to physically match and connect to your factory wiring harness without any modifications. This makes for a straightforward installation process.
- โ Rigorously Tested for Functionality: Every module undergoes comprehensive testing on our benches to ensure all circuits are operational and it’s ready to command your engine and transmission flawlessly.
- โ Broad Model Compatibility: This single unit is the correct replacement for a wide range of popular GM workhorses, including Silverado, Sierra, Express, Savana, Tahoe, and Yukon models.
Expert Insight: The Vortec Engine’s Lifeline
The Vortec engines in these late 90s/early 00s GM trucks are legendary for their durability, but they are entirely dependent on the PCM for everything from fuel mixture to spark timing and transmission control. Over time, the original capacitors and processors in these modules can fail from millions of heating and cooling cycles. A failing PCM can mimic a dozen other mechanical problems, leading to wasted time and money on unnecessary parts. Installing a professionally programmed 1999 GMC 2500 PCM 16263494 with updated software is the single most effective way to solve these complex electronic issues and ensure your workhorse engine runs for another 200,000 miles.
Frequently Asked Questions
Do I need to get this module programmed?
No. The programming service is included in the price. We will flash the module with the latest GM software matched to the VIN you provide, so it arrives ready to install.
Will I need to perform any other procedures after installation?
Yes, you will need to perform a simple security relearn procedure, also known as the Passlock or VATS relearn. This can be done yourself in about 30 minutes without any special tools and ensures the module syncs with your vehicle’s anti-theft system. We include instructions for this easy process.
Where is the PCM located on my vehicle?
On most trucks like the Silverado, Sierra, Tahoe, and Yukon, the PCM is located in the engine compartment on the driver’s side, often under or near the battery tray. On vans like the Express and Savana, it’s typically found in the rear of the engine compartment on the driver’s side.
What information do you need from me after I order?
After you complete your purchase, please send us your 17-digit Vehicle Identification Number (VIN). We cannot ship your part until we receive the VIN, as the programming is specific to your vehicle.
Will this fix my specific problem?
This module will correct any issues directly caused by a failing PCM. While it solves a wide range of electrical and performance problems, it’s essential to ensure your vehicle’s mechanical and wiring systems are in good condition. A proper diagnosis is always recommended. This 1999 GMC 2500 PCM 16263494 is the correct solution for an electronically failed computer.
Is this compatible with my original part number?
Yes, this module is the correct, programmed replacement for part numbers 16263494, 16265035, 8162634940, 218-11787, and 21811787. Please check the detailed fitment list to confirm your vehicle’s year, make, and model.