Restore Your GM Van’s Performance and Reliability
If you’re dealing with frustrating issues like your 1998-1999 GMC Savana 2500 van stalling, running rough, or simply refusing to start, a failing Powertrain Control Module (PCM) is often the culprit. As a technician with over two decades of experience, I’ve seen firsthand how a faulty engine computer can cause a cascade of problems that are tough to diagnose. This isn’t just an inconvenience; for a work van, it’s lost time and money. This replacement PCM is the straightforward, reliable solution to get your vehicle running properly again.
This is a quality, tested used PCM, sourced from a salvaged vehicle, that we program specifically for your van. Forget the hassle and high cost of dealership programming. Simply provide us with your vehicle’s VIN (Vehicle Identification Number) after purchase, and we’ll flash the module with the latest GM software updates. This ensures it communicates perfectly with your van’s specific systems, restoring factory performance and efficiency. It’s the most direct path to fixing complex electronic issues without the guesswork.
Case Study: The Ghost in the Machine
A local contractor brought in his ’99 Express 2500—a sister van to the Savana—with a problem that was driving him crazy. It would run fine for days, then suddenly stall at a stoplight or lose power on the highway. He’d replaced sensors and checked wiring, but the issue persisted. After connecting my scan tool, I saw no hard fault codes, just intermittent communication loss with the PCM. On these GM platforms, this is a classic sign of the main processor failing internally. We installed one of our VIN-programmed PCMs, performed the security relearn, and the van was back on the road, solid as a rock. He called a week later to say it hadn’t missed a beat since. This is the kind of reliable fix this part provides.
Is Your GM Truck or Van Showing These Symptoms?
- ✔ Check Engine Light is on with codes like P0601 (Internal Memory Error) or P0605 (ROM Error).
- ✔ Your vehicle fails to start or starts and then immediately stalls.
- ✔ Unexplained drop in fuel economy.
- ✔ The engine runs rough, misfires, or hesitates during acceleration.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Loss of communication with the scan tool.
A Straightforward Guide to Installation
Installing your 1998-1999 Savana 2500 PCM is a manageable job for a DIYer. While the exact location can vary slightly by model, the process is generally the same.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the PCM: On most Savana and Express vans, the PCM is found in the engine compartment, typically on the driver’s side near the battery or firewall.
- Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs that need to be released. Once disconnected, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed PCM into place and securely reconnect the electrical harnesses. Ensure they click into place.
- Reconnect Battery: Reattach the negative battery terminal.
- Perform Security Relearn: You will need to perform a simple security relearn procedure (often called a Passlock or Passkey relearn) to sync the new PCM with your vehicle’s anti-theft system. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times. Your vehicle will not start until this is completed. Instructions are readily available online for your specific model.
Verified Vehicle Compatibility
This module, identified by service number 16250279 or ID 09355699 / 9355699, is a direct fit for a wide range of GM trucks and vans. Please verify your original part number or match your vehicle from the list below. This part is compatible with other numbers including 16266645, 16258815, and 09366810.
- Chevrolet Express / GMC Savana Vans (1500, 2500, 3500): 1998-1999
- Chevrolet / GMC Pickups (1500, 2500, 3500): 1998-1999
- Chevrolet Tahoe / GMC Yukon: 1998-1999
- Chevrolet Suburban (1500, 2500): 1998-1999
- Cadillac Escalade: 1999
- Chevrolet Astro / GMC Safari: 1998
- Chevrolet S10 / GMC Sonoma / Isuzu Hombre (4.3L): 1998
- Chevrolet Blazer / GMC Jimmy / Oldsmobile Bravada (4.3L): 1998
- GMC Envoy: 1998
Frequently Asked Questions
How do I provide my VIN for programming?
After you complete your purchase, simply send us a message with your 17-digit VIN. We cannot ship the module until we receive this information, as the programming is essential for it to function in your vehicle.
Is this a new part?
No, this is a thoroughly tested, genuine GM part sourced from a salvaged vehicle. This provides a reliable and cost-effective solution compared to a new unit from a dealer.
Will I need to do anything else after installing it?
Yes. After installation, you must perform the vehicle’s security relearn procedure. This is a simple process that syncs the new PCM to your anti-theft system and does not require any special tools. Your vehicle will not start until this is done.
How do I know if this PCM will fit my truck?
The best way is to match the part number from your original PCM to one of the compatible numbers listed (e.g., 16250279 or 09355699). You can also use the detailed compatibility list provided above. If you’re unsure, feel free to contact us with your VIN.
What if my original part number is not listed?
The part numbers listed (like 16250279, 09355699, 16266645) cover a wide range of applications. If your number is different, please contact us. We can verify compatibility to ensure you get the correct part for your vehicle.