Restore Your Van’s Core Performance and Reliability
Is your 1998-1999 GMC Savana 1500 van running rough, stalling unexpectedly, or refusing to start? A faulty Powertrain Control Module (PCM), the vehicle’s central computer, is often the culprit behind these frustrating and hard-to-diagnose issues. I’ve seen it countless times in the shop: a great work van is sidelined by what seems like a ghost in the machine. This replacement PCM is the dependable, cost-effective solution to get your vehicle back on the road and working as hard as you do.
This isn’t just a used part pulled from a yard. We take a quality, OEM-salvaged computer and flash it with the latest GM software updates specifically for your vehicle. By providing your Vehicle Identification Number (VIN) at checkout, you receive a module that is truly plug-and-play. We handle the programming, so you can avoid a costly trip to the dealership and the hassle of specialized tools. This process ensures proper communication between the engine, transmission, and other vehicle systems, restoring the smooth operation you depend on.
Case Study: A Tricky Diagnosis
I remember a ’99 Savana that came into my bay with a complaint of intermittent stalling at stoplights and a flickering check engine light. The owner had already replaced the fuel pump and spark plugs with no luck. A scan showed a P0601 (Internal Control Module Memory Check Sum Error) code, but it wasn’t consistent. After checking all the grounds and wiring, we swapped in a VIN-programmed PCM like this one. The van immediately ran smoother, the code never returned, and the owner was back on the job the next day. Sometimes, the simplest solution is the right one, and a faulty computer can mimic a dozen other problems.
Is Your Van Showing These Symptoms?
A failing engine computer can cause a wide range of issues. If you’re experiencing any of the following, a faulty PCM could be the root cause. This 1998-1999 Savana 1500 PCM is the direct fix for these problems.
- ✔ Check Engine Light is on with codes like P0601, P0605, or U-series communication codes.
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained drops in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Intermittent stalling or rough idling.
- ✔ Failure to pass an emissions test.
- ✔ Apparent loss of spark or fuel injector pulse.
A Straightforward Guide to Installation
Installing your programmed 1998-1999 Savana 1500 PCM is a manageable job for a DIYer with basic tools. Following these steps ensures a smooth process.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any electrical work.
- Locate the PCM: On the 1998-1999 Savana Van, the PCM is typically located in the engine compartment, on the left-hand (driver’s) side, near the rear.
- Disconnect the Connectors: Carefully unclip and remove the wiring harness connectors from the old PCM. Inspect them for any corrosion or damage.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket. It’s usually held in by a few small bolts.
- Install the New Module: Mount your new, VIN-programmed PCM onto the bracket and securely fasten it.
- Reconnect Everything: Plug the wiring harness connectors firmly into the new module. Reconnect the negative battery terminal.
- Perform Security Relearn: Your vehicle is equipped with a Passlock security system. You will need to perform a simple 10 or 30-minute relearn procedure so the vehicle recognizes the new PCM. This involves turning the key to the ‘ON’ position for 10 minutes, then ‘OFF’, and repeating as necessary. Instructions are readily available online for this common procedure.
Verified Vehicle Compatibility
This module is a direct replacement for service number 16258815 and interchanges with several other part numbers, including 09355699 and 16266645. It is guaranteed to fit a wide range of GM trucks and vans from this era. Please verify your vehicle is on the list below and that your original module carries one of the compatible part numbers.
This part fits many models, including but not limited to:
- ✔ 1998-1999 GMC Savana 1500 / 2500 / 3500 Vans
- ✔ 1998-1999 Chevrolet Express 1500 / 2500 / 3500 Vans
- ✔ 1998-1999 Chevrolet & GMC C/K 1500, 2500, 3500 Pickups (Gasoline)
- ✔ 1998-1999 Chevrolet Tahoe & GMC Yukon (Gasoline)
- ✔ 1998-1999 Chevrolet & GMC Suburban (Gasoline)
- ✔ 1999 Cadillac Escalade
- ✔ 1998 Chevrolet Astro & GMC Safari
- ✔ 1998 Oldsmobile Bravada, Chevrolet S10 Blazer, GMC S15 Jimmy
- ✔ 1998 Isuzu Hombre (4.3L)
Frequently Asked Questions
Do I need to do anything after I install it?
Because we program the module to your VIN, no dealer flashing is required. However, you will need to perform a simple security relearn procedure (often called a Passlock relearn) which takes about 10-30 minutes and requires only your car key. This syncs the new PCM with your vehicle’s anti-theft system.
How do I provide my VIN?
After you complete your purchase, simply send us a message with your 17-digit Vehicle Identification Number (VIN). We cannot ship the module until we receive this information, as the programming is specific to your vehicle.
Is this a new part?
This is a high-quality, tested, and fully functional used OEM part sourced from a salvaged vehicle. We then program it with the latest software for your VIN, providing a reliable and affordable alternative to a new dealer part.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls both engine and transmission functions. If the computer is sending faulty signals, it can cause poor shifting, hunting for gears, or failure to shift. If your issues are electronic in nature, this module is the solution.
What if my part number isn’t 16258815 but is on the interchange list?
That’s perfectly fine. Manufacturers use many different service numbers for the same physical part. As long as your original part number is listed in our compatibility list (like 09355699 or 16266645), this module will function as a direct replacement.