Get Your Workhorse Running Right Again
Is your trusty GM truck or van giving you headaches? Stalling at intersections, refusing to start, or showing a persistent check engine light can bring your work to a grinding halt. Don’t let a faulty engine computer keep you off the road. This Powertrain Control Module (PCM) is the reliable, cost-effective solution to restore your vehicle’s performance and get you back to work. We pre-program this unit specifically for your vehicle using your VIN, ensuring it’s ready for a straightforward installation right out of the box.
Common Symptoms & Your Solution
A failing PCM can cause a host of frustrating and difficult-to-diagnose issues. If you’re experiencing any of the following, a faulty module is a likely culprit:
- Engine cranks but will not start
- Vehicle stalls intermittently while driving or at idle
- Harsh or erratic automatic transmission shifting
- Poor fuel economy and loss of power
- Check Engine Light is on with communication error codes (U-codes)
- No communication with the PCM using a scan tool
This professionally programmed unit is the definitive fix for these problems, restoring the critical link between your vehicle’s engine, transmission, and sensors. By purchasing a 1999 Chevy Express 3500 PCM 16266645 that’s flashed with the latest GM software, you’re not just replacing a part—you’re restoring your vehicle’s core operational integrity.
Features & Benefits
- ✔ VIN-Programmed for Your Vehicle: We flash the module with your specific VIN and the latest GM software updates. This ensures perfect compatibility and eliminates the need for an expensive trip to the dealership for programming.
- ✔ Plug-and-Play Installation: Because it arrives pre-programmed, installation is as simple as swapping the old module out and putting this one in. No special tools or software required.
- ✔ Restores Peak Operation: A correctly functioning PCM ensures optimal fuel delivery, ignition timing, and transmission shift points, bringing back the reliable performance your vehicle had from the factory.
- ✔ Broad GM Compatibility: This module is a direct replacement for multiple part numbers, including 09355699, 16266645, 9355699, 16250279, 16258815, 09366810, and 9366810, fitting a wide range of GM trucks, vans, and SUVs.
- ✔ Purchase with Confidence: This unit is backed by our one-year replacement warranty.
Expert Insight: The Brain of Your Vortec Engine
In the late 90s, the GM Vortec engine family was the heart of millions of work trucks and family haulers. The PCM, often called the ‘black box,’ is the brain behind that brawn. It does more than just manage the engine; it controls transmission shift strategy, ABS communication, and even the anti-theft system. When it fails, the entire vehicle is compromised. Using a used, OEM module like this 1999 Chevy Express 3500 PCM 16266645, professionally flashed with updated software, is often a more reliable solution than a poorly made aftermarket alternative. You’re getting a genuine GM part with software that has been refined to fix bugs the originals may have had.
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) is essential for us to load the exact, correct software for your vehicle’s specific engine, transmission, and options. This ensures the 1999 Chevy Express 3500 PCM 16266645 works perfectly right out of the box.
Is this part difficult to install?
For most of these GM trucks and vans, the PCM is located in the engine bay and is held in by a few bolts and electrical connectors. Installation is typically a straightforward process for a DIYer with basic hand tools. Always disconnect the battery before starting.
Will I need to have the keys reprogrammed?
For most vehicles of this era, a security relearn procedure may be required after installation. This is a simple process that typically involves turning the key on and off in a specific sequence and does not require a locksmith or special tools. We can provide instructions for this procedure.
Is this a new computer?
No, this is a quality used OEM computer that has been sourced from a salvaged vehicle. Each unit is tested for functionality before being programmed and shipped to ensure reliability.
How do I provide my VIN?
After you complete your purchase, you will need to send us your 17-digit VIN. You can typically add it as a note during checkout or send it to us in a message referencing your order number.