Is Your GM Truck or Van Running Rough?
If your 1999-2000 GMC Yukon, Chevy Silverado, Express Van, or other compatible GM vehicle is experiencing frustrating issues like stalling, erratic shifting, a persistent check engine light, or a no-start condition, a failing Powertrain Control Module (PCM) is often the culprit. As the central computer of your vehicle, the PCM is responsible for managing everything from fuel injection and spark timing to transmission shift points. When it fails, it can cause a wide range of performance problems that can leave you stranded.
From the Diagnostic Bay
We once had a 2000 Chevy Express 2500 van towed in that had its owner completely stumped. It would start and run for a few seconds, then die. The owner had already replaced the fuel pump and crank sensor. After connecting our scan tool, we noticed intermittent communication loss with the PCM. Before condemning the module, we checked the basics. A quick voltage drop test revealed a corroded ground wire on the engine block. A simple wire cleaning and re-tightening solved the problem. It’s a great reminder to always check your power and ground connections to the PCM before ordering a replacement—it can save you time and money.
Common Symptoms of a Failing PCM
- ✔ Persistent Check Engine Light (CEL) illumination
- ✔ Engine stalling, misfiring, or running poorly
- ✔ Noticeable decrease in fuel economy
- ✔ Harsh, delayed, or incorrect automatic transmission shifting
- ✔ The vehicle cranks but refuses to start
- ✔ Inability to communicate with the module using a diagnostic scan tool
- ✔ Unexplained error codes stored in the system
The Direct-Fit, Programmed Solution for Your Vehicle
Don’t settle for a generic, unprogrammed module that will cause more headaches. This Powertrain Control Module is a direct-fit replacement for your original unit, compatible with part numbers 16263494, 16265035, and 21811787. The key to our service is the VIN-specific programming. When you purchase, simply provide us with your vehicle’s VIN. Our technicians will then flash the module with the latest, most up-to-date software directly from GM. This ensures that the PCM is perfectly matched to your vehicle’s specific configuration, engine, and transmission, restoring original performance and efficiency.
Replacing Your 1999-2000 Yukon PCM
The installation process is straightforward. Once you receive your pre-programmed module, simply disconnect the battery, remove the old PCM, and install the new one. After reconnecting the battery, some GM vehicles of this era require a simple security relearn procedure, often called the Passlock or VATS relearn. This procedure syncs the new module with your vehicle’s anti-theft system and can typically be done in your driveway without any special tools. This simple step ensures your vehicle will start and run correctly with its new ‘brain.’ A properly functioning 1999-2000 Yukon PCM is critical for the reliability and drivability of your truck.
By choosing our programmed module, you are getting a reliable part that is ready to solve your vehicle’s issues right out of the box. Restore the performance and dependability you expect from your GM truck or van with this essential component. This is the definitive fix for a faulty computer, ensuring your engine and transmission operate in perfect harmony as the manufacturer intended.
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 VIN during or after checkout, and we will flash the module with the latest GM software specific to your truck or van.
What is a security relearn procedure?
It’s a simple process that syncs the new PCM to your vehicle’s anti-theft system. It usually involves turning the key to the ‘ON’ position for 10 minutes, off for 10 seconds, and repeating this cycle three times. This allows the vehicle to recognize the new module. Instructions are readily available online for your specific model.
Where is the PCM located on my vehicle?
On most GM trucks and vans from this era, the PCM is located in the engine compartment. On pickups like the Silverado and Sierra, it’s often on the driver’s side fender well, under the battery tray. On vans like the Express and Savana, it’s typically in the LH rear of the engine compartment.
Is this a plug-and-play part?
Yes, for the most part. Because it comes pre-programmed to your VIN, it is a direct plug-in replacement. The only additional step you may need to perform is the security relearn procedure, which requires no special tools.
How do I confirm this is the right part for my vehicle?
Please check the extensive fitment list on this page. The best way to be certain is to match the part number from your original module to one of the compatible numbers listed (e.g., 16263494, 21811787). If you’re unsure, feel free to contact us with your VIN.