Restore Peak Performance to Your GM Truck or Van
If your 1999-2000 GMC Yukon or other compatible GM vehicle is suffering from frustrating issues like stalling, erratic shifting, a persistent check engine light, or poor fuel economy, a failing Powertrain Control Module (PCM) is often the culprit. As the central computer of your vehicle, the PCM governs everything from fuel mixture and ignition timing to transmission shift points. When it falters, the entire vehicle’s performance suffers. This isn’t just an inconvenience; it can affect your vehicle’s reliability and safety. In my 20+ years of diagnostics, I’ve seen countless drivers replace expensive sensors and parts, only to find the root problem was the PCM all along.
This replacement PCM is the definitive solution. We take the guesswork and hassle out of the repair by programming the module specifically for your vehicle using your VIN. This means it arrives at your door with the latest GM software updates already installed, ready for a straightforward installation. You get a reliable, effective repair without the costly trip to a dealership for programming.
Case Study: A Tricky Diagnosis
A customer brought in a 2000 Chevy Express van with a complaint of intermittent hard shifting and a random no-start condition. They had already replaced the throttle position sensor and the crankshaft position sensor, but the problem persisted. No specific sensor codes were present, just a generic P0601 (Internal Control Module Memory Check Sum Error). After verifying power and ground to the PCM, it was clear the module’s internal processor was failing. We installed one of our pre-programmed modules, performed the security relearn, and the van ran perfectly. It’s a classic example of how a faulty PCM can mimic other component failures, making a direct replacement the only true fix.
Is Your GM Vehicle Showing These Signs of PCM Failure?
- ✔ Check Engine Light is illuminated, often with codes like P0601, P0605, or U-series communication codes.
- ✔ Your vehicle fails to start or starts intermittently.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ The engine stalls, sputters, or runs rough for no apparent reason.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Failure to pass an emissions inspection.
- ✔ Communication loss with your scan tool.
A Straightforward Guide to Installation
- ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- ✔ Locate the PCM: On most compatible trucks and vans, the PCM is located in the engine compartment, typically on the driver’s side fender well or near the battery.
- ✔ Disconnect Connectors: Carefully unlatch and remove the wiring harness connectors from the old module. Inspect them for any corrosion or damage.
- ✔ Remove Old Module: Unbolt the old PCM from its mounting bracket and remove it from the vehicle.
- ✔ Install New Module: Mount your new, pre-programmed PCM onto the bracket and securely re-fasten the bolts.
- ✔ Reconnect and Secure: Plug the wiring harnesses back into the new module until they click firmly into place. Reconnect the negative battery terminal.
- ✔ Perform Security Relearn: You will need to perform a simple security relearn procedure (often called a ‘key-on/key-off’ cycle) to sync the new PCM with your vehicle’s anti-theft system. This typically takes about 30 minutes and requires no special tools.
Verified Vehicle Compatibility
This module is a direct replacement for part numbers 16263494, 16265035, 8162634940, 218-11787, and 21811787. It is guaranteed to fit a wide range of GM trucks and vans. Please verify your vehicle is on this list. Note that for some 1998/1999 models, you must match the service ID number (ID 16263494) on your original module.
Fits select models of: GMC Yukon (1999-2000), Chevrolet Tahoe, Suburban, Silverado & C/K Pickups, GMC Sierra & C/K Pickups, Cadillac Escalade, Chevy Express & GMC Savana Vans, Chevy Astro & GMC Safari Vans, Chevy S10/Blazer, GMC Sonoma/Jimmy, Oldsmobile Bravada, and Isuzu Hombre. Please refer to the detailed fitment data to confirm compatibility with your specific year and engine.
Frequently Asked Questions
How does the VIN programming work?
After you complete your purchase, you will need to provide us with your vehicle’s 17-digit VIN. Our technicians use this number to load the exact, most current GM-approved software for your specific vehicle onto the module before we ship it. This ensures it works correctly right out of the box.
Is this a simple plug-and-play installation?
Almost. Because the module is pre-programmed to your VIN, it eliminates the need for dealer-level flashing tools. However, you will need to perform a standard security relearn procedure after installation so the PCM recognizes your vehicle’s keys. This process is straightforward and instructions are readily available online or in service manuals.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls transmission line pressure and shift solenoids based on data from various sensors. If the PCM is faulty, it can cause harsh shifting, delayed engagement, or hunting for gears. A new, correctly functioning 1999-2000 Yukon PCM often resolves these issues.
Do I need to send my old PCM back?
No core charge or return is required for this part. You can keep or recycle your old module.
Where is the PCM located on my 1999 Yukon?
On the 1999-2000 GMC Yukon and Chevy Tahoe, the Powertrain Control Module is typically found in the engine bay, mounted to a bracket on the driver’s side inner fender, near the battery.