Restore Peak Performance to Your GM Van or Truck

If you’re dealing with frustrating engine problems, a persistent check engine light, or poor fuel economy in your 1999-2002 GMC Savana 3500, the root cause is often the vehicle’s brain: the Powertrain Control Module (PCM). As a technician with over two decades of experience, I’ve seen firsthand how a failing PCM can create a host of baffling issues. This isn’t just a replacement part; it’s a comprehensive solution designed to restore your vehicle’s reliability and performance, arriving at your door programmed and ready for installation.

We take the guesswork and hassle out of the repair. Simply provide your vehicle’s VIN during checkout, and our experts will flash this module with the latest, most stable software updates directly from GM. This ensures perfect compatibility and often corrects underlying drivability issues that older software versions didn’t address. This is the same service a dealership provides, but without the high cost and inconvenience. With this pre-programmed 1999-2002 Savana 3500 PCM, you’re getting a part that’s ready to work the moment it’s installed.

Is Your Van Exhibiting These Telltale Signs?

A failing PCM doesn’t always die suddenly. It often gives warning signs. If you’re experiencing any of the following, your engine computer may be the culprit:

• ✔ Check Engine Light is on with codes like P0601, P0602, P0606, or U-series communication codes.
• ✔ The engine cranks but refuses to start.
• ✔ Unexplained drop in fuel economy.
• ✔ Harsh or erratic automatic transmission shifting.
• ✔ Engine stuttering, misfiring, or stalling for no apparent reason.
• ✔ Communication issues with your OBD-II scan tool.

A Straightforward Guide to Installation

Replacing the 1999-2002 Savana 3500 PCM is a task a confident DIYer can handle. While locations vary slightly by model (see fitment list), the process is generally the same.

1. Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental reconnection.
2. Locate the PCM: On most Savana/Express vans, it’s in the engine compartment on the driver’s side, near the rear. On pickups and SUVs, it’s often on the driver’s side fender well or near the battery.
3. Disconnect the Harnesses: Carefully unlatch and remove the electrical connectors. These connectors have locking tabs; do not force them. Inspect the pins for any corrosion or damage.
4. Remove the Old Module: Unbolt the old PCM from its mounting bracket. Keep the hardware as you’ll need it for the new module.
5. Install the New Module: Mount your new, pre-programmed PCM onto the bracket and secure it with the original hardware.
6. Reconnect Everything: Firmly plug the electrical harnesses back into the new module until they click into place. Reconnect the negative battery terminal.
7. Perform Security Relearn (If Necessary): 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, and repeating two more times. This allows the new PCM to sync with your vehicle’s anti-theft system.

Verified Vehicle Compatibility List

This module is a direct replacement for a wide range of GM trucks and vans. Please verify your vehicle is on this list and that your original module carries one of the compatible part numbers: 16263494, 16265035, or 8162634940.

Frequently Asked Questions About Your 1999-2002 Savana 3500 PCM