Restore Your GM Truck’s Brain and Get Back to Work
If your 1998-1999 GMC Savana 2500 Van is giving you headaches with stalling, no-start conditions, or a persistent Check Engine Light, the problem often lies with a failing Powertrain Control Module (PCM). As an experienced technician, I’ve seen countless work vans and trucks sidelined by a faulty computer. It’s the central command for your engine and transmission, and when it fails, everything grinds to a halt. This isn’t just an inconvenience; it’s lost time and money. This genuine, tested OEM PCM is your direct-fit, reliable solution.
We take the guesswork and dealer hassle out of the equation. Unlike pulling a random part from a junkyard, each module we ship is professionally programmed with the latest GM software updates specifically for your vehicle. All we need is your VIN. This ensures that when you receive your 1998-1999 Savana 2500 PCM, it’s ready to communicate perfectly with your engine, transmission, and all related sensors, often correcting underlying drivability issues the original software never addressed.
A Technician’s Notebook: The Phantom Misfire
I remember a ’99 Chevy Suburban that came into the shop with a stubborn misfire on cylinder 3. The owner had replaced the plug, wire, cap, and rotor, but the misfire code (P0303) kept coming back. On the scope, we saw the signal to the injector was weak and erratic. The culprit? A failing driver circuit inside the original PCM. It’s a common failure point on these older units after decades of heat cycles. We installed a VIN-programmed PCM just like this one, and the truck ran like it just rolled off the factory floor. Sometimes, the problem isn’t the part you think it is—it’s the computer controlling it.
Is Your GM Truck or Van Showing These Signs?
A failing PCM can manifest in numerous ways. If you’re experiencing any of the following, a replacement module is the likely fix:
- ✔ Check Engine Light is on with codes like P0601 (Internal Memory Error) or P0606 (PCM Processor Fault).
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained stalling or rough idling, especially when warm.
- ✔ Harsh, erratic, or delayed transmission shifting.
- ✔ A noticeable drop in fuel economy.
- ✔ Failure to pass an emissions or smog test.
- ✔ Communication errors with diagnostic scan tools.
A Straightforward Guide to PCM Installation
Installing your replacement 1998-1999 Savana 2500 PCM is a manageable job for a DIYer with basic tools. Follow these steps carefully for a smooth installation.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- Locate the PCM: On most of these GM vans and trucks, the PCM is located in the engine compartment, typically on the driver’s side inner fender or near the battery.
- Disconnect the Harnesses: Carefully unclip and remove the large electrical connectors from the old PCM. Inspect the pins for any corrosion or damage before proceeding.
- Remove the Old Module: Unbolt the PCM from its mounting bracket. It’s usually held in by a few 10mm bolts.
- Install the New Module: Mount your new, pre-programmed PCM onto the bracket and securely fasten the bolts.
- Reconnect Everything: Firmly plug the electrical harnesses back into the new module until they click into place. Reconnect the negative battery terminal.
- Final Step – Security Relearn: In some cases, you may need to perform a simple security relearn procedure. This typically involves turning the key to the ‘ON’ position for 10-15 minutes. Consult your vehicle’s service information for the exact procedure if needed.
Verified Vehicle Compatibility
This module, identified by part number 09355699, is a direct replacement for a wide range of GM vehicles. It is interchangeable with part numbers 16266645, 16250279, 16258815, and 09366810. Please verify your vehicle is on this list and that your original module carries one of these service numbers for guaranteed compatibility.
CHEVROLET 2500 PICKUP 98-99 (Gasoline)
CHEVROLET 3500 PICKUP 98-99 (Gasoline)
EXPRESS 1500/2500/3500 VAN 98-99 (Gasoline)
SAVANA 1500/2500/3500 VAN 98-99 (Gasoline)
SUBURBAN 1500/2500 98-99 (Gasoline)
TAHOE 98-99 (Gasoline)
GMC 1500/2500/3500 PICKUP 98-99 (Gasoline)
YUKON 98-99
CADILLAC ESCALADE 99
OLDSMOBILE BRAVADA 98 (4.3L, w/o build date opt ZN4)
GMC ENVOY 98 (w/o build date opt ZN4)
ISUZU HOMBRE 98 (4.3L, w/o extended build date opt ZN4)
CHEVROLET ASTRO 98
GMC SAFARI 98
CHEVROLET BLAZER S10 98 (w/o build date opt ZN4)
GMC JIMMY S15 98 (w/o build date opt ZN4)
CHEVROLET S10/GMC SONOMA 98 (4.3L, w/o build date opt ZN4)
Frequently Asked Questions About Your PCM
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to program the PCM with the exact software and calibrations your specific vehicle requires. This includes engine size, transmission type, and any other factory options, ensuring it works perfectly right out of the box.
Is this part truly plug-and-play?
Yes, because we program it to your VIN, it is designed to be a plug-and-play installation. In rare cases, a simple ‘security relearn’ procedure may be needed, which doesn’t require special tools.
Will this fix my hard transmission shifting?
In many cases, yes. The PCM controls transmission line pressure and shift points. If the module is failing, it can cause erratic and harsh shifting. A new, correctly programmed PCM with updated software often resolves these issues.
This is a used part. How can I be sure it’s reliable?
Every module is sourced from a salvaged vehicle and then undergoes a thorough inspection and testing process on a dedicated bench simulator to ensure all circuits are functioning correctly before it is programmed and shipped.
What if my original part number isn’t an exact match to 09355699?
This module is a direct replacement for several part numbers, including 16266645, 16250279, 16258815, and others listed. As long as your vehicle is on the compatibility list, this programmed module will function correctly.