Is Your GM Truck or Van Running Rough?
If your 1998-1999 Savana 3500 is experiencing baffling issues like a persistent check engine light, erratic shifting, a no-start condition, or poor fuel economy, the problem often points directly to a failing Powertrain Control Module (PCM). As the central computer for your engine and transmission, a faulty PCM can cause a host of frustrating problems that can sideline your vehicle. In my 20+ years as a technician, I’ve seen these exact symptoms hundreds of times on this generation of GM trucks. The good news is, the fix is more straightforward than you might think.
The Simple, Reliable Solution: A VIN-Programmed PCM
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We are offering a dependable, used OEM PCM that is professionally programmed to your vehicle’s specific Vehicle Identification Number (VIN). This critical step ensures that the computer has the correct software and calibrations for your engine, transmission, and options, straight from GM’s official database.
- โ VIN Programmed for You: We flash the module with the latest GM software updates using your VIN before it ships. This ensures perfect compatibility.
- โ No Dealer Required: Because the programming is done beforehand, this becomes a simple plug-and-play installation. No expensive trips to the dealership for coding are necessary.
- โ Guaranteed Compatibility: This module is a direct replacement for a wide range of part numbers, including 16250279 and 09355699. See our full fitment list to confirm.
- โ Cost-Effective Repair: Get a reliable, tested OEM part that solves the problem without the high cost of a new module.
Expert Pro Tip from a 20-Year Veteran Technician
Before you replace your PCM, take 10 minutes to check the main engine-to-chassis ground straps. On these GM vans and trucks, a corroded or loose ground (often found near the alternator bracket or on the back of the passenger-side cylinder head) can cause low voltage to the PCM, mimicking failure symptoms like flickering gauges and random codes. Cleaning the contact points with a wire brush is a simple check that has saved my customers hundreds of dollars in unnecessary diagnostics.
Easy Installation to Get You Back on the Road
You don’t need to be a master mechanic to install this part. The process is designed to be simple and can typically be done in under 30 minutes with basic hand tools.
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the PCM: On most of these vehicles, the PCM is located in the engine bay, typically on the driver’s side inner fender or near the battery.
- Disconnect and Remove: Carefully unclip the wiring harness connectors. They have locking tabs, so be gentle. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed PCM into place. Firmly reconnect the wiring harnesses until they click, ensuring a secure connection.
- Reconnect Battery: Re-attach the negative battery terminal. Your vehicle is now ready to start.
Is This the Right Part for Your 1998-1999 Savana 3500 PCM?
This engine computer is the correct fit for a massive range of GM vehicles from 1998-1999. It is a direct replacement for units with service numbers 09355699, 16266645, 9355699, 16250279, 16258815, 09366810, and 9366810. Whether you have a Chevrolet Express, GMC Sierra, Suburban, Tahoe, or an Isuzu Hombre, if your original module carries one of these numbers, this is the correct, pre-programmed replacement for you. Simply provide your VIN at checkout, and we’ll handle the rest.