Restore Peak Performance to Your GM Truck or Van
Is your 1998-1999 GMC Savana, Chevy Express, or other GM truck plagued by frustrating issues like stalling, a persistent check engine light, or a no-start condition? The Powertrain Control Module (PCM), often called the engine’s brain, is a common culprit. This vital component manages everything from fuel delivery and ignition timing to transmission shifting. When it fails, it can cause a cascade of problems that are often misdiagnosed, leading to costly and unnecessary repairs. This listing is for a reliable, used OEM PCM, part number 09355699, that serves as a direct-fit replacement for your faulty unit.
The Critical Role of a Programmed 1998-1999 Savana PCM
Unlike a simple mechanical part, a PCM is a sophisticated computer that must be precisely calibrated to your vehicle’s specific configuration. Factors like engine size, transmission type, and factory options are all stored within its software. That’s why we offer a comprehensive programming service. When you purchase this module, we will flash it with the latest official GM software updates using the Vehicle Identification Number (VIN) you provide. This ensures that the computer you receive is perfectly matched to your vehicle, eliminating compatibility issues and ensuring seamless integration. It arrives ready for installation, helping you get back on the road quickly and confidently.
From the Diagnostic Bay
We had a 1999 Chevy Suburban 1500 come into the shop with an intermittent stalling problem that was driving the owner crazy. It would die at stoplights without warning, but then start right back up. He had already replaced the fuel pump and ignition control module with no luck. After hooking up our professional scan tool, we noticed that the PCM would randomly lose communication with other modules right before the stall occurred. This pointed to an internal failure in the engine computer. We sourced a quality used PCM, programmed it to the truck’s VIN, and performed the security relearn procedure. The Suburban ran perfectly, and the stalling issue was completely resolved. It’s a classic example of how a failing PCM can mimic other component failures.
Symptoms of a Failing GM Engine Computer
- ✔ Check Engine Light: The light is on, and you may have codes related to PCM failure, sensor circuits, or communication errors (U-codes).
- ✔ No-Start Condition: The engine cranks but refuses to start, often due to a lack of fuel injector pulse or spark command from the PCM.
- ✔ Engine Stalling: The vehicle stalls unexpectedly while driving or at idle for no apparent reason.
- ✔ Poor Performance & Fuel Economy: You may notice a significant drop in gas mileage, hesitation during acceleration, or a general lack of power.
- ✔ Erratic Transmission Shifting: The transmission may shift harshly, at the wrong times, or get stuck in one gear (limp mode).
- ✔ Failed Emissions Test: A faulty PCM can prevent the engine from running cleanly, leading to a failed smog check.
This module is a dependable and cost-effective solution to these common issues. Sourced from a salvaged vehicle and rigorously tested, it provides OEM reliability without the high cost of a new dealership part. By providing us with your VIN, you guarantee that the part you receive is correctly configured for your exact vehicle, taking the guesswork out of the repair.
Installation Note: While this PCM is programmed to your VIN, your vehicle’s anti-theft system (VATS/Passlock) will need to relearn the new computer. This is a straightforward security procedure that can typically be performed by the owner in their driveway with no special tools required. Instructions for this process are widely available online for your specific model.
Frequently Asked Questions
Why do I need to provide my VIN?
Your vehicle’s VIN allows us to program the PCM with the exact software and calibrations for your specific engine, transmission, and options. This ensures perfect compatibility and function, just like the original module.
Is this part plug-and-play?
Almost. The module is programmed and ready for installation, but you will need to perform a security relearn procedure so your vehicle’s anti-theft system recognizes the new computer. This is a simple process you can do yourself.
What are the most common signs my PCM is failing?
The most common symptoms include a check engine light with communication error codes, intermittent stalling, a no-start condition where the engine still cranks, and erratic transmission shifting.
Is this a new computer?
No, this is a high-quality, tested used OEM computer sourced from a salvaged vehicle. This provides the reliability of a genuine GM part at a fraction of the cost of a new one.
Will this PCM fit other vehicles besides the Savana van?
Yes, this PCM with part number 09355699 fits a wide range of 1998-1999 GM trucks and vans, including the Chevy/GMC pickups, Suburban, Tahoe, Yukon, Express, and more. Please check the detailed fitment list on this page to confirm compatibility.