Restore Your Van’s Performance and Reliability
Is your 1999-2002 GMC Savana 1500 van plagued by frustrating issues like a persistent check engine light, rough idling, stalling, or poor fuel economy? These are classic signs of a failing Powertrain Control Module (PCM), the central computer of your vehicle. A faulty PCM can disrupt everything from engine timing to transmission shifting, making your workhorse van unreliable. This replacement PCM, part number 16263494, is the definitive solution to get your vehicle running smoothly and efficiently again.
As a seasoned technician, I’ve seen firsthand how a failing PCM can cause a cascade of problems that are often misdiagnosed. This isn’t just a part; it’s the core of your vehicle’s operational logic. We take the guesswork and hassle out of the repair. Each module is professionally programmed with the latest official GM software updates, specifically matched to your vehicle using your VIN. This means you receive a part that is truly plug-and-play, eliminating the need for an expensive trip to the dealership for programming.
A Technician’s Notebook
I remember a 2001 Express 2500 that came into the shop with a maddening intermittent no-start condition. The owner had already replaced the battery, alternator, and starter. It would run fine for days, then suddenly refuse to crank. After hours of tracing wires, we found a corroded ground strap near the engine block. This poor ground had been sending voltage spikes back to the PCM, slowly cooking its internal circuits. We replaced the ground and installed a freshly programmed 1999-2002 Savana 1500 PCM (the same family of modules). The van fired up instantly and the problem never returned. It’s a powerful reminder that the PCM is sensitive and a solid electrical foundation is key to its longevity.
Is Your Van Showing These Red Flags?
A failing PCM can manifest in various ways. If you’re experiencing any of the following, it’s a strong indicator that your module needs attention:
- ✔ Unexplained Check Engine Light (CEL) activation
- ✔ Stored diagnostic trouble codes (DTCs) like P0601, P0602, or P0606
- ✔ Vehicle fails to start or has a hard starting condition
- ✔ Rough or erratic engine idle
- ✔ Noticeable decrease in fuel efficiency
- ✔ Harsh or incorrect automatic transmission shifting
- ✔ Engine stalling or cutting out while driving
Your Straightforward PCM Installation Guide
Installing your new 1999-2002 Savana 1500 PCM is a manageable job for a DIYer with basic tools. Follow these steps carefully for a successful replacement.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent any accidental power surges.
- Locate the Module: On most Savana and Express vans, the PCM is located in the engine compartment, typically on the driver’s side (LH rear engine compartment). It’s a metal box with several large electrical connectors.
- Disconnect the Connectors: Carefully release the locking tabs on each of the wiring harness connectors and pull them straight out from the module. Avoid pulling on the wires themselves.
- Remove the Old PCM: Unbolt the mounting hardware that secures the old PCM to its bracket. Note the orientation before removing it completely.
- Install the New PCM: Mount the new module in the same position as the old one and secure it with the original hardware.
- Reconnect Everything: Firmly plug the wiring harness connectors into the new PCM until they click into place. Reconnect the negative battery terminal.
- Perform Security Relearn (If Necessary): In many cases, you will need to perform a simple security relearn procedure to sync the new PCM with your vehicle’s anti-theft system. This typically involves turning the key to the ‘ON’ position for 10-15 minutes. Consult your owner’s manual for the specific procedure for your vehicle.
Verified Fitment For These GM Models
This module is a direct replacement for part number 16263494 and is also compatible with part numbers 16265035, 8162634940, 218-11787, and 21811787. Please verify your vehicle is on this list and provide your VIN upon purchase for correct programming. This module fits a wide range of GM trucks and vans, including many Chevrolet, GMC, Isuzu, and Oldsmobile models from approximately 1998 to 2002. Refer to the detailed fitment list provided on this page to confirm compatibility.
Frequently Asked Questions
Do I need to get this programmed by a dealer?
No. We handle the programming for you before we ship. Simply provide your vehicle’s VIN during checkout, and it will arrive ready to install with the latest GM software.
What is a VIN and where do I find it?
The VIN is your 17-digit Vehicle Identification Number. You can find it on your vehicle’s registration, insurance card, or on a small plate on the driver’s side dashboard visible through the windshield.
Will I need to perform any other procedures after installation?
You may need to perform a simple security relearn procedure, which takes about 10-15 minutes and involves cycling the ignition key. In some cases, a Crankshaft Position Sensor (CASE) relearn may be required, which can be done with many professional-grade scan tools.
Is this a reliable replacement for my original PCM?
Absolutely. This module is a high-quality replacement built to meet or exceed original equipment specifications. With the latest software updates, it often resolves issues that were present even in the original factory programming.
My original part number isn’t 16263494 but is on the compatible list. Will this work?
Yes. This module is a direct replacement for all part numbers listed in the description (16263494, 16265035, 8162634940, 218-11787, 21811787). As long as your vehicle is on the fitment list, we will program it correctly for your specific application.