Is Your GM Truck or Van Suddenly Unreliable?
There’s nothing more frustrating than a vehicle you can’t count on, especially when it’s your daily workhorse or family hauler. If you’re dealing with a persistent check engine light, strange shifting behavior, a rough idle, or even a vehicle that won’t start at all, the problem often points to a failing Powertrain Control Module (PCM). This isn’t just an inconvenience; it’s a critical failure that sidelines your truck or van. This Programmed 9355699 PCM is the straightforward, reliable solution to get you back on the road with confidence.
Common Symptoms & Your Solution
A faulty PCM can cause a cascade of confusing issues. You might be experiencing one or more of the following:
- Check Engine Light (CEL) with communication-related Diagnostic Trouble Codes (DTCs).
- No-Start or Hard-Start Condition: The engine cranks but refuses to fire up.
- Erratic Transmission Shifting: Harsh shifts, getting stuck in gear, or delayed engagement.
- Poor Engine Performance: Misfires, stalling, hesitation, and a noticeable loss of power or fuel economy.
- Failure to pass emissions testing.
Instead of wrestling with a dead module or paying steep dealership prices for programming, this unit offers a direct path to repair. We take a genuine, tested GM module and flash it with the latest factory software, specifically matched to your vehicle’s VIN. This ensures all systems communicate correctly from the moment you install it, restoring the dependable operation you need. This is the definitive fix for a failed computer.
Features & Benefits
- ✔ VIN-Programmed for Your Vehicle: We flash the module with your truck’s specific VIN before shipping. This means it arrives ready for a plug-and-play installation, eliminating the need for expensive dealer programming tools.
- ✔ Updated GM Software: Your module is loaded with the newest updates from General Motors, ensuring optimal engine performance, fuel efficiency, and transmission control.
- ✔ Restored Drivability: By replacing your faulty unit, you’ll solve those frustrating performance issues, smooth out your idle, and restore crisp, correct transmission shifts.
- ✔ Cost-Effective Repair: Get a reliable, pre-programmed part at a fraction of the cost of a new module and dealership service, putting your truck back to work without breaking the budget.
- ✔ Peace of Mind Included: This unit is backed by our one-year replacement warranty. Drive with the assurance that your vehicle’s core electronic system is solid.
Expert Insight: The Heartbeat of Your Truck
Back in the late 90s, these GM computers were the central hub for everything. They didn’t just manage the engine; they talked to the transmission, the anti-lock brakes, and even the security system (Passlock/VATS). That’s why simply swapping a used computer from another truck often leads to a no-start condition or a host of other electrical gremlins. Having a Programmed 9355699 PCM that is correctly matched to your VIN is non-negotiable. It ensures the security handshake is correct and all the operating parameters are set for your specific engine, transmission, and options package, making for a smooth repair and reliable long-term operation.
Frequently Asked Questions
Do I need to do anything after installation?
In most cases, this is a plug-and-play installation. However, some GM vehicles of this era may require a Security Relearn procedure, which is a simple process you can do yourself without any special tools. Additionally, a Crankshaft Variation Relearn (CASE Relearn) may be needed with a scan tool to clear a P1336 code, though the vehicle will run and drive without it.
How do I provide my Vehicle Identification Number (VIN)?
After you complete your purchase, you will need to send us your 17-digit VIN. You can typically find this on your vehicle’s registration, insurance card, or on a plate on the driver’s side of the dashboard visible through the windshield.
Is this a new part?
No, this is a thoroughly tested, genuine used computer that was sourced from a salvaged vehicle. This allows us to provide a reliable and affordable solution for keeping these classic trucks and vans on the road.
How do I know this will fit my vehicle?
This module, identified by service number 9355699, fits a wide range of 1998-1999 GM trucks, vans, and SUVs. Please carefully review the detailed fitment list on this page to confirm compatibility with your specific make, model, and engine size. Matching the part number is the most reliable way to ensure a correct fit.
What if I have questions during installation?
Our team has extensive experience with these vehicles. If you encounter an issue, please contact us. We are here to help guide you through the process and ensure your repair is successful.