Restore Peak Performance to Your GM Truck or Van
Is your workhorse 1999-2002 GMC Savana 3500 Van running rough, stalling unexpectedly, or showing a persistent Check Engine Light? These are classic signs of a failing Powertrain Control Module (PCM), the central computer that manages your engine and transmission. Ignoring these symptoms can lead to poor fuel economy, failed emissions tests, and even leave you stranded. This replacement PCM is the reliable, straightforward solution to get your vehicle running like new again.
From the Diagnostic Bay: The Intermittent Stall Case
I remember a 2001 Savana 3500 work van that came into my shop with a frustrating problem. The owner, a plumber, said it would run fine for an hour, but after getting hot on a job site, it would refuse to restart. There were no consistent codes, just a history of random misfires. After checking fuel pressure and spark, which were fine when it was running, I focused on the PCM. Heat soak is a common killer of these modules. We installed a new, properly programmed PCM, and the problem vanished. That van went on to serve him reliably for another 100,000 miles. It’s not just about replacing a part; it’s about restoring dependability.
Is Your GM Van or Truck Showing These Signs?
A failing PCM can cause a wide range of confusing issues. If you’re experiencing any of the following, this module is likely the solution you need:
- ✔ Persistent Check Engine Light (CEL)
- ✔ Diagnostic Trouble Codes (DTCs) related to internal module failure, such as P0601 or P0606
- ✔ Engine stalling or shutting off while driving
- ✔ Rough or erratic idling
- ✔ Harsh or incorrect transmission shifting
- ✔ A no-start condition where the engine cranks but won’t fire up
- ✔ Noticeable decrease in fuel efficiency
- ✔ Failure to pass state emissions testing
The Power of VIN-Specific Programming
Don’t settle for a generic, off-the-shelf module that requires an expensive trip to the dealership. We take the hassle out of the process. When you purchase, simply provide us with your vehicle’s 17-digit VIN. Our technicians will then program this 1999-2002 Savana 3500 PCM with the latest official GM software specific to your exact vehicle configuration. This ensures that your engine, transmission, anti-theft system (PassLock/VATS), and all other related systems communicate flawlessly, just as they did from the factory.
A Straightforward Guide to Installation
Installing your new PCM is a manageable job for a DIY enthusiast. Follow these steps carefully for a smooth installation. Typically, the PCM is located in the engine compartment on the driver’s side.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental reconnection.
- Locate the PCM: On most Savana and Express vans, the PCM is found in the LH (driver’s side) rear of the engine compartment. On pickups and SUVs, it’s often on the driver’s side fender well or near the battery.
- Disconnect the Harnesses: Carefully unplug all electrical connectors from the old PCM. These connectors have locking tabs that may need to be squeezed or lifted to release. Do not force them.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket. Keep the hardware, as you may need it for the new module.
- Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and secure it with the original hardware.
- Reconnect Everything: Plug the electrical harnesses firmly into the new module. You should hear or feel a ‘click’ as they lock into place. Reconnect the negative battery terminal.
- Final Steps: Depending on your vehicle, a security relearn procedure may be required. This is a simple process you can do yourself (instructions are easily found online or in your service manual). It typically involves turning the key to the ‘ON’ position for 10-15 minutes.
Verified Vehicle Compatibility
This module, part number 16265035, is a direct replacement for several original part numbers including 16263494, 8162634940, 218-11787, and 21811787. It fits a wide range of GM trucks, vans, and SUVs. Please verify your vehicle from the list below:
Astro (99-01), Blazer (98-00), C/K Pickups (99-00), Express Van (99-02), S10 (98-00), Silverado (99-00), Suburban (99), Tahoe (99-00)
GMC:
C/K Pickups (99-00), Envoy (98-00), Jimmy (98-00), Safari Van (99-01), Savana Van (99-02), Sierra (99-00), Sonoma (98-00), Yukon (99-00)
Cadillac:
Escalade (99-00)
Oldsmobile:
Bravada (98-00)
Isuzu:
Hombre (98-00)
Note: Specific engine and build options apply. Matching the part number or confirming with your VIN is the best way to ensure perfect fitment.
Frequently Asked Questions
Why do I need to provide my VIN?
Your VIN (Vehicle Identification Number) allows us to program the PCM with the exact software your vehicle needs. This includes engine and transmission calibrations, tire size, gear ratios, and security information, ensuring a true plug-and-play installation.
Is this part difficult to install?
For most DIYers with basic tools, this is a straightforward job that takes less than an hour. The most important steps are disconnecting the battery and carefully handling the electrical connectors.
Will this fix my Check Engine Light?
If the Check Engine Light is caused by an internal PCM failure (like code P0601), then yes, this module will resolve the issue and allow the light to be cleared.
What is the difference between an ECM and a PCM?
The terms are often used interchangeably. ECM (Engine Control Module) typically just controls the engine. A PCM (Powertrain Control Module) is more integrated and controls both the engine and the automatic transmission, which is standard for these GM vehicles.
Do I need to do a security or CASE relearn after installation?
In many cases, a simple key-cycle security relearn may be needed, which you can do at home. A CASE (Crankshaft Angle Sensor Error) relearn is sometimes required to clear a P1336 code and is best done with a professional scan tool, though the vehicle will run fine without it.