Is Your Workhorse Van Stumbling? Get It Back on the Job.
If your 1998 or 1999 GMC Savana 3500 is showing signs of trouble—like a persistent Check Engine Light, erratic shifting, a no-start condition, or just plain poor performance—the Powertrain Control Module (PCM) is often the culprit. As the brain of your vehicle, when it fails, it can cause a cascade of frustrating and hard-to-diagnose issues. You need a reliable solution that doesn’t involve days of downtime and a massive bill from the dealership.
This is a thoroughly tested, OEM Powertrain Control Module that offers a direct-fit, plug-and-play solution. We take the guesswork and hassle out of the repair. Before this module ever leaves our facility, we flash it with the latest official GM software, programmed specifically to your vehicle’s unique VIN. This ensures perfect communication between your engine, transmission, and all related systems, restoring the performance and reliability you depend on.
The Real-World Diagnosis: A Story from the Shop
“A customer’s ’99 Savana 3500 work van came in last week with a persistent P0601 code, which is an Internal Control Module Memory Check Sum Error. The driver complained of harsh 1-2 shifts and intermittent stalling at idle. After my technician verified the main power and ground circuits to the PCM were solid—a critical first step—we knew the module itself had failed internally. Swapping in a pre-programmed unit like this one had their van running smoothly and back on the road in under an hour, saving them from a costly tow to the dealer and a lost day of work.”
Common Symptoms of a Failing PCM:
- ✔ Persistent Check Engine Light (CEL)
- ✔ Unexplained engine stalling or misfires
- ✔ Harsh or failed transmission shifting
- ✔ Poor fuel economy
- ✔ Complete no-start or intermittent starting issues
- ✔ Communication error codes with a scan tool
Plug-and-Play Installation: No Dealer Visit Required
Installing your replacement 1998-1999 Savana 3500 PCM is a straightforward process you can do with basic hand tools. Since we program it beforehand, you won’t need any special scan tools or a trip to the dealership.
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the PCM: On most Savana/Express vans, the PCM is located in the engine compartment, typically on the driver’s side, sometimes near the rear of the engine bay. On other compatible vehicles like pickups, it’s often on the driver’s side fender well.
- Disconnect the Connectors: Carefully unclip and remove the electrical wiring harnesses from the old module. Inspect the pins and connectors for any corrosion or damage and clean them if necessary.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket.
- Install the New Module: Bolt your new, pre-programmed PCM into place and securely reconnect the wiring harnesses.
- Reconnect the Battery: Reattach the negative battery terminal. The vehicle is now ready to start.
Guaranteed Compatibility and VIN Programming
This module, identified by part number 16266645, is a direct replacement for a wide range of GM trucks and vans. It is interchangeable with several other part numbers, including 09355699, 16250279, and 16258815. To ensure a flawless installation, you must provide your vehicle’s 17-digit VIN at checkout. This allows us to load the correct, updated software for your specific engine, transmission, and options. This is not a generic part; it’s a solution tailored for your vehicle.
Don’t let a faulty computer keep your truck or van sidelined. This pre-programmed 1998-1999 Savana 3500 PCM is the most efficient and cost-effective way to solve complex electronic issues and restore your vehicle’s factory operation.