Restore Your GM Vehicle’s Performance and Reliability
Is your 1998 Express 2500 Van running rough, stalling unexpectedly, or showing a persistent Check Engine Light? As a technician with over two decades of experience under the hood of these workhorse GM vehicles, I’ve seen these symptoms countless times. The culprit is often a failing Powertrain Control Module (PCM), the central computer that manages everything from fuel mixture and spark timing to transmission shifts. When it falters, your vehicle’s performance and dependability suffer. This isn’t just an inconvenience; it can leave you stranded.
This replacement PCM is the definitive solution. It’s not just a part; it’s a restoration of your vehicle’s core logic. We take the guesswork out of the repair by programming the module specifically for your vehicle using your VIN. This ensures it has the latest GM software updates and communicates perfectly with your engine, transmission, and all other onboard systems. You get a reliable, direct-fit component that solves the problem without a costly trip to the dealership for programming.
Case Study: The Intermittent Stall
A customer brought in a ’98 GMC Savana 3500—a close cousin to your Express van—with a frustrating issue. It would run perfectly for days, then suddenly stall at a stoplight and refuse to restart for 10-15 minutes. No consistent codes were stored, just a history of random communication errors. After checking all the usual suspects (fuel pressure, ignition system), we focused on the PCM. On the bench, a thermal test revealed the problem: as the module reached operating temperature, an internal processor would fail, cutting communication. Replacing the PCM with a VIN-programmed unit like this one permanently solved the ghost-in-the-machine problem. This is a classic failure mode I’ve diagnosed on dozens of these GM platforms.
Common Signs of a Failing PCM
If you’re experiencing any of the following, a faulty PCM is a highly likely cause. A failing module can often trigger diagnostic trouble codes (DTCs) such as P0601, P0604, or P0606, indicating internal memory or processor errors.
- ✔ Check Engine Light is on or flashing
- ✔ Engine stalling, stumbling, or hesitating
- ✔ No-start or hard-starting conditions
- ✔ Poor fuel economy
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Failure to pass emissions testing
- ✔ Loss of communication with the scan tool
A Straightforward Guide to Installation
This module is designed for a direct-fit replacement. For the confident DIYer or professional mechanic, the process is simple and requires only basic hand tools. Getting it right ensures a smooth, one-time repair.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any electrical work.
- Locate the PCM: On most 1998 Express and Savana vans, the PCM is located in the engine compartment on the driver’s side, near the battery or firewall.
- Disconnect Connectors: Carefully unlatch and remove the electrical wiring harness connectors from the old module. Inspect them for any corrosion or damage.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket and remove it from the vehicle.
- Install the New Module: Mount your new, pre-programmed PCM onto the bracket and securely fasten the bolts.
- Reconnect and Secure: Firmly plug the wiring harnesses into the new module until they click into place. Reconnect the negative battery terminal.
- Security Relearn (If Necessary): In some cases, a security relearn procedure may be required. This typically involves cycling the key and can be done without special tools. We include instructions for this simple process.
Verified Vehicle Compatibility
This module, identified by part number 16250279, is a direct replacement for service numbers 16250279, 09366810, and 09355699. It fits a wide range of Chevrolet and GMC trucks, vans, and SUVs. Please verify your vehicle is on the list below and that your original module carries one of these service numbers.
ASTRO: 1998-1999
BLAZER S10/JIMMY S15: 1998
BRAVADA: 1998
CHEVROLET 1500/2500/3500 PICKUP: 1998-1999
ENVOY: 1998
ESCALADE: 1999
EXPRESS 1500/2500/3500 VAN: 1998
GMC 1500/2500/3500 PICKUP: 1998-1999
ISUZU HOMBRE: 1998
S10/S15/SONOMA: 1998
SAFARI (GMC): 1998-1999
SAVANA 1500/2500/3500 VAN: 1998
SUBURBAN 1500/2500: 1998-1999
TAHOE/YUKON: 1998-1999
Note: Specific options may apply. Matching the part number is the most reliable way to ensure compatibility.
How do I provide my VIN for programming?
How do I provide my VIN for programming?
After you complete your purchase, simply send us a message with your vehicle’s 17-digit Vehicle Identification Number (VIN). We will program the module with the latest GM software matched to your VIN before we ship it.
Do I need to have this programmed by a dealer after I receive it?
No. The main benefit of our service is that the module arrives at your door fully programmed and ready for installation. This saves you the time, expense, and hassle of a dealership visit.
Will this fix my hard shifting or transmission problems?
In many cases, yes. The PCM controls the transmission’s electronic solenoids and shift points. If the module is failing, it can cause erratic shifting, delayed engagement, or other transmission-related symptoms. A new PCM often resolves these issues.
Is this a brand new part?
This is a high-quality, reconditioned OEM part that has been thoroughly tested, cleaned, and has its software updated to the latest available calibration for your vehicle. It meets or exceeds original factory specifications for performance and reliability.
What if my original part number doesn’t match 16250279 exactly?
This module is also a direct replacement for part numbers 09366810 and 09355699. As long as your original module has one of these three numbers, this part will be a correct fit for your vehicle.