Get Your Dependable GM Truck Back on the Road
Is your trusty 1998-1999 GM truck, van, or SUV suddenly stalling, refusing to start, or running rough? A failing Powertrain Control Module (PCM) is often the culprit behind these frustrating and immobilizing issues. Don’t let a bad computer sideline the vehicle you rely on. This replacement PCM is the straightforward, reliable solution to restore your vehicle’s performance and get you back to work and on the road with confidence. We take the guesswork out of the repair by pre-programming this unit specifically for your vehicle using your VIN, ensuring a seamless installation process.
Common Symptoms of a Failing GM PCM & Your Solution
If you’re experiencing any of the following, a faulty engine computer is the likely cause. This unit is the definitive fix for:
- Complete no-start condition where the engine cranks but won’t fire.
- Intermittent stalling for no apparent reason, either while driving or at idle.
- Harsh or erratic automatic transmission shifting.
- Check Engine Light illumination with communication error codes (e.g., P0601, P0605).
- Poor fuel economy and reduced engine power.
- Erratic behavior from dashboard gauges.
Instead of paying for expensive diagnostics and dealership programming, this programmed 16258815 PCM arrives ready to solve the problem. It’s the smart, efficient way to fix it right the first time.
Features & Benefits
- ✔ Plug & Play Installation: This unit is professionally programmed to your vehicle’s unique VIN. This critical step ensures it communicates correctly with your truck’s systems right out of the box, eliminating the need for a costly trip to the dealership.
- ✔ Updated GM Software: We flash the module with the latest software updates from General Motors. This can resolve underlying factory bugs, improve transmission shifting logic, and enhance overall engine performance and efficiency.
- ✔ Guaranteed Compatibility: This computer is a direct replacement for part numbers 16258815, 09355699, 16266645, and others listed in the fitment guide, ensuring a perfect match for your vehicle.
- ✔ Cost-Effective Repair: Get your vehicle running perfectly again without the high cost of a new-from-dealer part. This is a practical and budget-friendly solution for a critical component.
- ✔ Peace of Mind Guarantee: This unit is backed by our one-year replacement warranty.
An Expert’s Take on GMT400 Reliability
As a technician with over two decades of experience, I have a deep respect for these late-90s GM trucks and SUVs. They are some of the most durable and straightforward vehicles ever built. However, after 20+ years of heat cycles and vibrations, the original PCM is often the one electronic component that gives up. The good news is that replacing it with a properly programmed 16258815 PCM is like turning back the clock, restoring the rock-solid dependability these trucks are famous for. This isn’t just a repair; it’s an investment in keeping a legendary vehicle on the road for years to come.
Frequently Asked Questions
What do I need to do after I place my order?
After you complete your purchase, you must provide us with your vehicle’s 17-digit VIN (Vehicle Identification Number). We cannot program and ship the module without it. You can typically add this in the buyer’s notes during checkout or send it to us in a message.
Will any additional programming be required after installation?
In most cases, you will need to perform a simple security relearn procedure (often called a CASE relearn or Passlock relearn) after installation. This syncs the new computer with your vehicle’s anti-theft system and can typically be done in your driveway with just the ignition key. Instructions for this procedure are widely available online for your specific model.
Is this a new computer?
No, this is a high-quality, tested computer that has been sourced from a salvaged vehicle. This allows us to provide a reliable and affordable solution for your repair needs.
How do I find my vehicle’s VIN?
Your VIN can be found on a metal plate on the driver’s side of the dashboard (visible through the windshield), on the driver’s side door jamb sticker, and on your vehicle’s registration and insurance documents.
How can I be sure this fits my truck?
Please review the detailed fitment list on this page. The most accurate way to ensure compatibility is to match the part number from your original computer to one of the numbers listed, such as 16258815 or 09355699.