Is Your GM Truck or Van Running Rough?
If you’re dealing with frustrating issues like a persistent check engine light, erratic engine behavior, poor fuel economy, or even a no-start condition in your 1998-1999 GM vehicle, a failing Powertrain Control Module (PCM) is often the culprit. The PCM is the brain of your vehicle, managing everything from fuel injection and ignition timing to transmission shifting. When it fails, it can cause a cascade of problems that are difficult to diagnose. This isn’t just an inconvenience; it’s a critical component failure that can leave you stranded.
We offer a straightforward and reliable solution: a genuine, used OEM Powertrain Control Module with service number 9355699. This isn’t just a part in a box. It’s a fully programmed, plug-and-play solution tailored specifically to your vehicle. Simply provide us with your Vehicle Identification Number (VIN) after purchase, and our technicians will flash the module with the latest, most stable software updates directly from GM. This ensures perfect compatibility and restores your vehicle’s original performance and reliability.
From the Diagnostic Bay
I once had a 1999 Chevy Suburban in the shop that was driving the owner crazy. It had a random misfire code that would pop up, and the transmission would shift hard intermittently. The owner had already replaced spark plugs, wires, and even the transmission fluid, all to no avail. After hooking up the scanner, I noticed the data stream from the PCM was inconsistent. The processor was struggling. Instead of chasing more phantom sensor issues, we installed a correctly programmed PCM. The difference was immediate. The engine smoothed out, the transmission shifted like new, and all the codes vanished. It’s a classic case of the symptoms pointing everywhere except the real source: the vehicle’s central computer.
Common Symptoms of a Failing PCM
- ✔ Check Engine Light is on with various, often unrelated, trouble codes.
- ✔ Vehicle refuses to start or stalls unexpectedly.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Engine stutters, misfires, or runs poorly.
- ✔ Failure to pass emissions testing.
- ✔ Communication errors with diagnostic scan tools.
The Right Solution for Your 1998-1999 Savana PCM
Replacing the PCM on these classic GM trucks and vans can be a headache. Sourcing a compatible part is only the first step; it then requires expensive programming at a dealership. Our service eliminates that hassle. We take a quality, road-tested used module and professionally program it to your exact VIN. This means it arrives ready for installation, often only requiring a simple security relearn procedure that you can do yourself. This 1998-1999 Savana PCM is a direct replacement for part number 9355699 and is also compatible with other service numbers like 16266645, 16250279, and 9366810, ensuring broad fitment across many popular models like the Chevy Silverado, GMC Sierra, Tahoe, Yukon, and Express vans.
Don’t let a faulty engine computer keep your reliable truck off the road. This is the most efficient and cost-effective way to restore your vehicle’s core electronic functions. By providing your VIN, you guarantee that the module you receive is perfectly matched to your vehicle’s specific options and systems, just as it was from the factory.
Frequently Asked Questions
What is a PCM?
The Powertrain Control Module (PCM), also known as the Engine Control Module (ECM), is your vehicle’s main computer. It controls all aspects of engine and transmission operation to ensure optimal performance, fuel economy, and emissions.
Is any additional programming required after installation?
No. We program the unit with your vehicle’s VIN and the latest GM software before shipping. In most cases, you will only need to perform a simple security relearn procedure (often called a CASE learn or anti-theft relearn), which can be done without special tools. We can provide instructions for this process.
How do I provide my VIN?
After you complete your purchase, you can send us a message with your 17-digit VIN. We cannot ship the part until we receive your VIN, as programming is a required step.
Is this a new part?
This is a high-quality, tested, and fully functional used OEM part sourced from a salvaged vehicle. Each unit is inspected and programmed by our expert technicians to ensure it meets or exceeds original factory standards.
My original part number is different. Will this still work?
Yes, this module (9355699) is a direct replacement for several part numbers, including 09355699, 16266645, 16250279, 16258815, 09366810, and 9366810. As long as your vehicle is on the compatibility list, this programmed module will work perfectly.