Restore Your Van’s Reliability and Performance
Is your 1998-1999 GMC Savana 2500 van running rough, stalling unexpectedly, or refusing to start? A failing Powertrain Control Module (PCM) is often the culprit behind these frustrating and costly issues. As the central computer for your engine and transmission, its health is critical for your van’s operation. This isn’t just a replacement part; it’s a direct solution to get your workhorse vehicle back on the job, running smoothly and dependably. We take the guesswork and extra expense out of the repair by programming this module specifically to your vehicle’s VIN before it ever leaves our facility.
A Technician’s Notebook: The Intermittent Stall Case
I remember a customer with a ’99 Express van—essentially the same platform—that had a ghost of a problem. It would run perfectly for days, then suddenly stall at a stoplight and refuse to restart for 10 minutes. No consistent check engine light, just random, infuriating stalls. After checking fuel pressure and ignition components, which were all fine, we focused on the PCM. On these late-90s GM vehicles, I’ve seen internal solder joints on the PCM board crack from years of heat cycles and vibration. This creates an intermittent open circuit that cuts power to the fuel pump or injectors without warning. Swapping in a tested, correctly programmed PCM like this one solved the problem instantly. It’s a classic failure mode I’ve diagnosed hundreds of times.
Common Signs of a Failing Engine Computer
If the brain of your vehicle is struggling, it will let you know. A faulty module can manifest in various ways, disrupting your van’s performance and leaving you stranded. Here are some of the most common indicators that your PCM may need replacement:
- ✔ Check Engine Light is on with codes like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (PCM Processor Fault).
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained drops in fuel economy.
- ✔ Rough or erratic idling and stalling.
- ✔ Harsh or incorrect automatic transmission shifting.
- ✔ Communication errors with diagnostic scan tools.
A Straightforward Guide to Installation
One of the biggest benefits of our service is that this 1998-1999 Savana 2500 PCM arrives ready to install. No need for a trip to the dealer for expensive programming. You can perform this replacement with basic hand tools right in your driveway.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 10 minutes to ensure the system is fully discharged.
- Locate the PCM: On the Savana and Express vans, the PCM is typically located in the engine compartment, on the left-hand (driver’s) side, often near the rear of the engine bay.
- Disconnect the Harnesses: Carefully unclip and disconnect the electrical wiring harnesses from the old module. The connectors have locking tabs that may need to be gently pried or squeezed to release.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket. Keep the hardware, as you will need it to install the new unit.
- Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and securely tighten the bolts. Reconnect the wiring harnesses, ensuring they click firmly into place.
- Reconnect and Start: Reconnect the negative battery terminal. The vehicle may require a security relearn procedure, which typically involves turning the key to the ‘ON’ position for 10-15 minutes before starting. Consult your owner’s manual for specific steps if needed.
Verified Vehicle Compatibility
This module, identified by service number 16258815 or ID 09355699 / 9355699, is a direct replacement for a wide range of GM trucks and vans. Please verify your part number or contact us with your VIN to confirm fitment. This part is compatible with the following vehicles equipped with matching options:
- Chevrolet:
- Astro Van (1998)
- Blazer S10 (1998)
- C/K 1500/2500/3500 Pickup (1998-1999)
- Express 1500/2500/3500 Van (1998-1999)
- S10 Pickup (1998)
- Suburban 1500/2500 (1998-1999)
- Tahoe (1998-1999)
- GMC:
- Envoy (1998)
- Jimmy S15 (1998)
- C/K 1500/2500/3500 Pickup (1998-1999)
- Safari Van (1998)
- Savana 1500/2500/3500 Van (1998-1999)
- Sonoma S15 (1998)
- Yukon (1998-1999)
- Other GM:
- Cadillac Escalade (1999)
- Oldsmobile Bravada (1998)
- Isuzu Hombre (1998)
This quality used part has been sourced from a salvaged vehicle and is ready to provide many more years of reliable service. By purchasing this 1998-1999 Savana 2500 PCM, you are choosing a cost-effective and dependable repair.
What exactly is VIN programming?
What exactly is VIN programming?
VIN programming is the process of loading your vehicle’s specific software and settings onto the PCM. This includes information about your engine, transmission, and factory options. We perform this service before shipping, so the module is ready to install and operate your vehicle correctly without any additional dealer visits.
Is this a new part?
No, this is a high-quality, tested computer that has been sourced from a salvaged vehicle. Each unit is inspected to ensure it is fully functional before being programmed and shipped.
How do I provide my VIN?
After you complete your purchase, you will need to send us your 17-digit Vehicle Identification Number (VIN). You can typically find this on your vehicle’s dashboard (visible through the windshield) or on the driver’s side door jamb sticker. This is crucial for us to program the module correctly.
Will I need to do anything else after installation?
In most cases, the module is plug-and-play. However, some GM vehicles of this era may require a simple security relearn procedure (often called a Passlock or Passkey relearn). This can usually be done without special tools by following a sequence of key turns. We recommend checking your vehicle’s specific procedure.
My part number is slightly different, will this work?
This module replaces several part numbers, including 09355699, 16266645, and others listed. As long as your vehicle is on the compatibility list and your original module has one of the interchangeable part numbers, this part will function correctly once programmed to your VIN.