Get Your Workhorse Van Back on the Road Fast
Is your 1998-1999 GMC Savana 2500 van running rough, stalling unexpectedly, or refusing to start? As a mechanic with over two decades of experience under the hood, I’ve seen these symptoms countless times. Often, the culprit is a failing Powertrain Control Module (PCM), the central computer of your vehicle. When it fails, it can cause a cascade of frustrating issues, from poor fuel mileage to a dead vehicle. This isn’t just an inconvenience; it’s lost time and money, especially when your van is your livelihood.
We offer a dependable and straightforward solution: a thoroughly tested, used OEM PCM with service ID 9355699. The best part? We handle the complex part for you. Before shipping, we will program the module with the latest GM software updates, specifically matched to your van’s Vehicle Identification Number (VIN). This means you receive a part that is truly ready for installation, saving you a costly trip to the dealership and their programming fees. This is the smart, efficient fix for getting your Savana running reliably again.
From the Diagnostic Bay: The Intermittent No-Start Nightmare
I remember a 1998 Express Van—a close cousin to the Savana—that came into my shop. The owner was at his wit’s end. He’d replaced the battery, alternator, and starter, but the van would randomly refuse to start. There were no consistent codes, just an intermittent crank-no-start condition. After checking fuel pressure and spark, which were intermittently absent, my gut pointed to the PCM. On these older GM platforms, the internal processors can develop micro-fractures, leading to heat-sensitive failures. We swapped in a VIN-programmed PCM just like this one. The van fired up on the first try and never had the issue again. It’s a classic failure mode, and this is the definitive fix.
Is Your Van Exhibiting These Classic PCM Failure Signs?
A failing PCM can manifest in various ways. If you’re experiencing any of the following, a faulty engine computer is a likely cause:
- ✔ Check Engine Light is illuminated with codes like P0601 (Internal Control Module Memory Check Sum Error) or P0605 (Internal Control Module ROM Error).
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained stalling or rough idling.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ A noticeable drop in fuel economy.
- ✔ Communication errors with your scan tool.
A Straightforward Guide to Installation
One of the biggest benefits of our service is the ease of installation. Because we program the module beforehand, you can perform the swap yourself with basic hand tools. For the 1998-1999 Savana 2500 PCM, the module is typically located in the left-hand rear of the engine compartment.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before working on electrical components.
- Locate and Remove: Find the PCM in the engine bay. Carefully unplug the electrical connectors—they have locking tabs that need to be released. Then, unbolt the module from its bracket.
- Install the New Module: Bolt the replacement PCM into place and securely reconnect all the electrical harnesses. Ensure they click into place.
- Reconnect Battery: Reattach the negative battery terminal.
- Perform Security Relearn: This is a crucial final step. Turn the key to the ‘ON’ position (without starting the engine) for 10-15 minutes. The security light should turn off. Turn the key off for 10 seconds. Repeat this cycle two more times (for a total of three cycles). Your vehicle will then recognize the new PCM, and you’ll be ready to start the engine.
Verified Vehicle Compatibility
This Electronic Control Module, identified by service number 9355699, is a direct-fit replacement for a wide range of GM trucks, vans, and SUVs. While this listing is for the 1998-1999 Savana 2500, it also fits many other models. Please verify your original module has the ID number 9355699. Compatible part numbers include: 09355699, 16266645, 16250279, 16258815, and 09366810.
Do I need to have this module programmed by a dealer?
No. We program the module to your vehicle’s specific VIN before we ship it. It arrives ready for installation and the security relearn procedure.
What is the security relearn procedure?
It’s a simple process that syncs the new PCM with your vehicle’s anti-theft system. It involves cycling the ignition key on and off for set periods, as described in the installation guide above. No special tools are needed.
Is this a new part?
No, this is a high-quality, tested used part sourced from a salvaged vehicle. This allows us to provide a reliable, cost-effective solution.
How do I give you my VIN?
After you complete your purchase, you will need to send us a message with your 17-digit VIN. We cannot program and ship your part without it.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls both engine and transmission functions. Erratic shifting is a very common symptom of a failing PCM, and replacing it often resolves these issues.