Is Your Trusty GM Truck or Van Suddenly Unreliable?
There’s nothing more frustrating than turning the key on your work van or family SUV and being met with silence, a check engine light, or an engine that runs rough and stalls. Your 1998-1999 GM vehicle is the backbone of your daily life, and when its brain—the Powertrain Control Module (PCM)—starts to fail, everything grinds to a halt. You’re left dealing with unpredictable performance, poor fuel economy, and the constant worry of being stranded. This isn’t just an inconvenience; it’s lost time and money.
Common Symptoms of a Failing GM PCM & Your Solution
A faulty PCM can cause a wide range of confusing issues. If you’re experiencing any of the following, there’s a high probability your engine computer is the culprit:
- Complete no-start or intermittent starting problems
- Engine stalling, stumbling, or running rough
- Harsh or erratic automatic transmission shifting
- A persistent Check Engine Light with communication-related codes (like P0601, P0605, P0606)
- Poor fuel mileage and loss of power
- Inability for a scan tool to communicate with the module
This genuine, road-tested PCM is your direct, effective solution. We take the guesswork and hassle out of the repair by programming it specifically to your vehicle’s unique Vehicle Identification Number (VIN) before it ships. This ensures that it communicates perfectly with your vehicle’s systems, restoring the dependable performance you rely on. By using a Programmed GM 9355699 PCM, you are choosing a straightforward path to getting your vehicle back in service.
Features & Benefits
- ✔ VIN-Programmed for Your Vehicle: We flash the unit with the latest GM software updates for your specific VIN. This means it arrives ready for a much simpler installation process, saving you a costly trip to the dealership.
- ✔ Restores Peak Performance: A correctly functioning PCM is critical for engine efficiency, fuel economy, and smooth transmission operation. Get your power and mileage back.
- ✔ Solves Frustrating Electrical Gremlins: Put an end to confusing, intermittent issues caused by a failing computer. This module provides a stable, reliable foundation for your vehicle’s electronics.
- ✔ Cost-Effective Solution: Get a dependable, programmed module for a fraction of the cost of a new unit from a dealer. It’s the smart choice for keeping your workhorse on the road without breaking the bank.
- ✔ This unit is backed by our one-year replacement warranty.
An Expert’s Note on GM “Black Box” Computers: The PCM in these late-90s GM trucks and vans is a workhorse, but it’s also specific. Grabbing one from a salvage yard without programming is a recipe for a headache. The Vehicle Anti-Theft System (VATS/Passlock) will prevent the engine from starting. Our service of pre-programming this Programmed GM 9355699 PCM to your VIN handles the complex part for you. In most cases, you’ll simply need to perform a straightforward security relearn procedure after installation, which typically doesn’t require special tools. This saves you hundreds in programming fees and diagnostic time.
Frequently Asked Questions
What information do you need from me?
After you complete your purchase, you must provide us with your 17-digit Vehicle Identification Number (VIN). We cannot program and ship the module without it. The VIN is typically found on your driver’s side dashboard (visible through the windshield) or on the driver’s door jamb sticker.
Is this part difficult to install?
The physical installation is generally straightforward for someone with basic mechanical skills. It involves disconnecting the battery, unplugging the electrical connectors, and unbolting the old module. Because this Programmed GM 9355699 PCM is pre-flashed, you avoid the need for advanced programming tools. You may need to perform a security relearn procedure, which can often be done with just the ignition key. We recommend consulting a repair manual for your specific vehicle’s procedure.
Will this fix my exact problem?
This PCM is a direct solution for failures within the module itself. While it corrects the vast majority of the symptoms listed above, it’s essential to ensure your vehicle’s wiring and sensors are in good condition. Proper diagnosis is always recommended. This module will not fix issues caused by faulty wiring or other failed components.
Is this a used computer?
Yes, this is a genuine OEM computer sourced from a salvaged vehicle. Each unit is thoroughly inspected and tested to ensure it is fully functional before being programmed and shipped to you. This provides OEM reliability at a more accessible price point.
How do I find my part number?
Your original PCM will have a sticker on it with the service number. This unit is a direct replacement for service numbers 09355699, 16266645, 9355699, 16250279, 16258815, 09366810, and 9366810. As long as your vehicle is listed in the compatibility chart, this programmed unit will work, even if your original number differs slightly.