Is Your Workhorse Van Stumbling? Restore its Power and Reliability.
The Powertrain Control Module (PCM), often called the Engine Control Module (ECM), is the electronic brain of your 1998-1999 Chevrolet Express or GMC Savana Van. It meticulously manages everything from fuel injection and spark timing to transmission shift points and emissions controls. When this critical component begins to fail, it can cause a cascade of confusing and frustrating problems, turning your reliable vehicle into a source of constant headaches. From a sudden drop in fuel economy to a van that refuses to start, a faulty PCM can bring your work or travels to a grinding halt.
Common Symptoms of a Failing PCM
- ✔ Check Engine Light: The most common sign. The light may be on constantly or intermittently, often with codes that seem unrelated or random.
- ✔ Engine Performance Issues: You might experience rough idling, engine stumbling, hesitation during acceleration, or a noticeable loss of power.
- ✔ Poor Fuel Economy: If the PCM can’t properly regulate the air-fuel mixture, your van’s gas mileage can plummet unexpectedly.
- ✔ Transmission Problems: The PCM also controls automatic transmission functions. A faulty module can lead to harsh shifting, delayed engagement, or getting stuck in one gear.
- ✔ No-Start Condition: In severe cases, the PCM can fail completely, preventing the engine from starting at all, even if the battery and starter are good.
- ✔ Failed Emissions Test: A malfunctioning PCM can prevent the emissions system from operating correctly, leading to an automatic failure at the inspection station.
The Direct-Fit Solution: Your 1998-1999 Express 3500 PCM
Don’t let a faulty computer sideline your vehicle. This is a genuine, road-tested OEM Powertrain Control Module, the same quality part that was installed in your van at the factory. We take the guesswork and complexity out of the repair by pre-programming the module specifically for your vehicle. Simply provide us with your van’s Vehicle Identification Number (VIN) during checkout, and our technicians will flash the unit with the latest, most stable software updates from General Motors. This ensures perfect compatibility with your engine, transmission, and all factory options.
This isn’t just a replacement part; it’s a restoration of your vehicle’s core operational integrity. The process is simple: you order, you provide your VIN, and we ship a module that is ready to be installed right out of the box. No expensive trips to the dealership for programming are required. This plug-and-play solution for your 1998-1999 Express 3500 PCM gets you back on the road faster and more affordably.
Guaranteed Fitment for Multiple Part Numbers
This module is a direct replacement for a wide range of GM trucks and vans from this era. It is compatible with the following service and ID numbers:
09355699, 16266645, 9355699, 16250279, 16258815, 09366810, 9366810
This part will fit the following makes and models (verify your part number or ID 09355699):
- 1998-1999 Chevrolet & GMC 1500/2500/3500 Pickups (Gasoline)
- 1998-1999 Chevrolet Express & GMC Savana 1500/2500/3500 Vans (Gasoline)
- 1998-1999 Chevrolet Suburban 1500/2500 (Gasoline)
- 1998-1999 Chevrolet Tahoe & GMC Yukon
- 1999 Cadillac Escalade
- 1998 Chevrolet Astro & GMC Safari
- 1998 Oldsmobile Bravada
- 1998 GMC Envoy
- 1998 Isuzu Hombre (4.3L)
- 1998 Chevrolet S10 & GMC Sonoma (4.3L)
- 1998 Chevrolet S10 Blazer & GMC S15 Jimmy
Frequently Asked Questions
Why do you need my VIN?
Your vehicle’s VIN (Vehicle Identification Number) allows us to program the PCM with the exact software and calibrations for your specific engine, transmission, and factory options. This ensures the module works perfectly right out of the box.
Is this part difficult to install?
Installation is straightforward for someone with basic mechanical skills. The PCM is typically located in the engine bay. It involves disconnecting the battery, unplugging the electrical connectors, and unbolting the old module to swap in the new one. No special programming tools are needed on your end.
Will I need to perform a security relearn procedure?
For many GM vehicles of this era, a security relearn (often called a Passlock or VATS relearn) may be necessary after installation. This is a simple procedure that typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times. Instructions are readily available online for your specific model.
Is this a used part?
Yes, this is a genuine OEM part sourced from a salvaged vehicle. Each unit is thoroughly inspected and tested to ensure it is fully functional before being programmed and shipped to you. This provides OEM quality and reliability at a significant saving.
What if my original part number is not 09366810 but is on the list?
If your part number is one of the compatible numbers listed (e.g., 09355699, 16266645), this module will work for your vehicle. We program it based on your VIN, making it a direct replacement for any of the part numbers in the interchange list.