Restore Peak Performance to Your GM Truck or Van
Is your work van or truck plagued by frustrating issues like a persistent check engine light, erratic shifting, a no-start condition, or poor fuel economy? These are classic signs of a failing Powertrain Control Module (PCM), the electronic brain of your vehicle. Don’t let a faulty computer keep your vehicle off the road. This replacement PCM is the reliable, straightforward solution you need to restore your vehicle’s engine and transmission performance to factory specifications.
As a technician, I’ve seen countless GM vehicles from this era come into the bay with baffling electrical problems that trace back to a failing computer. This isn’t just a part; it’s a definitive fix. We take the guesswork and hassle out of the repair by programming this module specifically to your vehicle’s VIN before it ships. This process installs the latest official GM software updates, often correcting drivability issues you didn’t even know were software-related. You get a component that’s ready for installation right out of the box, saving you a costly trip to the dealership for programming.
A Technician’s Notebook
I remember a 2001 Express 2500 work van that came in on the hook. The owner was at his wit’s end. It would run fine for weeks, then suddenly refuse to start, only to fire right up an hour later. No consistent codes, just intermittent chaos. After checking the usual suspects—fuel pressure, spark, crank sensor—I focused on the PCM. On these vans, it’s tucked in the engine bay where it soaks up heat. I used a heat gun on the old PCM, and sure enough, the no-start condition returned every time. A replacement, like this one, solved the problem for good. Heat cycles and vibration are the top enemies of these older modules, causing internal connections to fail over time.
Is Your GM Truck or Van Showing These Signs?
A failing PCM can manifest in many ways. If you’re experiencing any of the following, a faulty engine computer could be the culprit:
- ✔ Unexplained Check Engine Light (CEL)
- ✔ Diagnostic Trouble Codes (DTCs) like P0601, P0604, or P0606 pointing to internal module failure
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Engine stalling, stumbling, or misfiring
- ✔ Intermittent no-start or hard-starting conditions
- ✔ Noticeable decrease in fuel efficiency
- ✔ Failure to communicate with a diagnostic scan tool
A Straightforward Guide to Installation
Installing your new 1999-2002 Savana 3500 PCM is a job most DIYers or any professional mechanic can handle. Since we program it beforehand, you can skip the expensive dealership visit.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any electrical work.
- Locate the PCM: On most Savana and Express vans, the PCM is located in the engine compartment, typically on the driver’s side. On pickups and SUVs, it’s often on the driver’s side fender well or near the battery.
- Disconnect and Remove: Carefully unplug the electrical connectors. There are usually retaining clips that need to be released. Once disconnected, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new PCM into place and securely reconnect all electrical harnesses. Ensure they click into place to establish a solid connection.
- Reconnect Battery: Re-attach the negative battery terminal.
- Perform Security Relearn (If Needed): In many cases, you may need to perform a simple security relearn procedure. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’ for 10 seconds, and repeating this cycle three times. This allows the new PCM to sync with your vehicle’s anti-theft system.
Verified Vehicle Compatibility
This module is a direct replacement for a wide range of GM vehicles and is compatible with part numbers 16263494, 16265035, 8162634940, 218-11787, and 21811787. Please verify your vehicle is on the list below. Providing your VIN at checkout is essential for correct programming.
GMC: C1500/C2500/C3500 Pickup, Envoy, Jimmy S15, Safari, Savana 1500/2500/3500 Van, Sierra 1500, Sonoma, Yukon
Cadillac: Escalade
Oldsmobile: Bravada
Isuzu: Hombre
Note: This part fits specific years and engine options within these models from approximately 1998-2002. The provided fitment list in the product details contains the exact applications.
Frequently Asked Questions
Do I need to program this module?
No. We handle all the programming for you before shipment. Simply provide your vehicle’s 17-digit VIN during or after checkout, and we will flash the module with the latest GM software for your specific vehicle.
Where do I find my VIN?
Your VIN can be found on the driver’s side of the dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.
Is this a simple plug-and-play installation?
Yes, for the most part. After physically installing the module, you may need to perform a security relearn procedure, which is a simple process that does not require special tools. Instructions are widely available online or in service manuals.
What is the difference between a PCM and an ECM?
ECM stands for Engine Control Module, while PCM stands for Powertrain Control Module. For these GM vehicles, the terms are often used interchangeably. A PCM is technically more comprehensive as it controls both the engine and the transmission functions, which is what this module does.
Will this fix my transmission shifting problems?
If the shifting problems are caused by faulty electronic commands from the PCM, then yes, this will resolve them. The PCM controls shift points and line pressure. However, it will not fix internal mechanical issues within the transmission itself.