Is Your Truck or Van Running Rough? Get It Back on the Job.
If you’re dealing with frustrating, intermittent issues like a rough idle, poor fuel mileage, a no-start condition, or a persistent Check Engine Light, a failing Powertrain Control Module (PCM) is often the culprit. For a hard-working vehicle like your Chevrolet 3500, Express Van, or Suburban, you can’t afford the downtime. This isn’t just a part; it’s the solution to restoring the reliability you depend on. This module is the central computer for your vehicle, and we’ll program it specifically for your truck or van using your VIN, ensuring it’s ready to install and get you back on the road fast.
Common Symptoms & Your Solution
A faulty engine computer can cause a wide range of problems that can be difficult to diagnose. If you’re experiencing any of the following, this pre-programmed PCM is the definitive fix:
- Stalling, stumbling, or hesitation during acceleration
- Erratic or harsh automatic transmission shifting
- Reduced power and poor fuel economy
- Vehicle won’t start, but the battery and starter are good
- Check Engine Light with codes like P0601 (Internal Control Module Memory Check Sum Error) or P0300-P0308 (Engine Misfires)
Ordering this module is the most effective step towards a reliable 1999 Chevrolet 3500 PCM replacement, solving the root cause of these electronic headaches.
Features & Real-World Benefits
- ✔ Programmed to Your VIN: We flash the unit with the latest GM software updates specific to your vehicle. This means no expensive trips to the dealer for programming – it’s ready for installation right out of the box.
- ✔ Plug & Play Installation: Once you perform the simple security relearn procedure (instructions included), your vehicle will start and run correctly. It’s designed for a straightforward swap.
- ✔ Cost-Effective Solution: Get a dependable, tested OEM computer for a fraction of the cost of a new unit from a dealership, without sacrificing quality or fitment.
- ✔ Broad GM Compatibility: This single unit is a direct replacement for a wide range of part numbers, including 09355699, 16266645, and 16250279, covering dozens of GM trucks, vans, and SUVs from 1998-1999.
- ✔ Peace of Mind: This unit is backed by our one-year replacement warranty. Drive with confidence knowing your purchase is protected.
Expert Insight: The Heart of Your Vortec Engine
The Vortec V8 engines in these late-90s GM trucks are legendary for their durability. Many are still on the road with 200,000, 300,000, or even more miles. The key to that longevity is ensuring the electronics that manage them are functioning perfectly. This PCM is the ‘brain’ that controls everything from fuel mixture and spark timing to transmission shift points. A fresh, properly programmed computer doesn’t just fix problems—it restores the crisp, reliable performance that made these trucks famous. A proper 1999 Chevrolet 3500 PCM replacement ensures your workhorse can keep running strong for years to come.
Frequently Asked Questions
What information do I need to provide?
After you complete your purchase, you must provide us with your vehicle’s 17-digit Vehicle Identification Number (VIN). We cannot ship your part until we have this information, as we use it to program the computer specifically for your vehicle’s factory options.
Will I need to do anything after installing it?
Yes. On most GM vehicles of this era, you will need to perform a simple security relearn procedure, also known as a CASE relearn. This process syncs the new computer with your vehicle’s anti-theft system and crankshaft position sensor. It typically takes about 30 minutes and does not require special tools. We can provide instructions for this procedure.
Is this a new computer?
No, this is a high-quality, used OEM computer that has been sourced from a salvaged vehicle. Each unit is thoroughly inspected and tested to ensure it is fully functional before being programmed and shipped.
How do I know for sure that my PCM is the problem?
While the symptoms listed are strong indicators, it’s always best to have a qualified mechanic diagnose the issue. Common diagnostic steps include checking all power and ground connections to the PCM, verifying sensor inputs, and scanning for specific trouble codes like P0601, which almost always points to internal computer failure. This 1999 Chevrolet 3500 PCM replacement is the solution once a faulty module is confirmed.
Will this fit my vehicle if my part number isn’t 16250279?
Yes, this computer is a direct replacement for multiple part numbers, including 09355699, 16266645, 9355699, 16258815, and more. As long as your vehicle make, model, year, and engine match the fitment list, we will program it to work perfectly in your truck or van.