Restore Peak Performance to Your GM Truck or Van
Is your trusty 1999-2000 GMC Yukon, or another GM vehicle from that era, suddenly giving you headaches? Maybe it’s a persistent Check Engine Light, rough idling, stalling for no reason, or transmission shifts that feel harsh and unpredictable. As a technician with over two decades of experience under the hood, I’ve seen these exact symptoms hundreds of times. More often than not, the culprit is a failing Powertrain Control Module (PCM)—the central computer of your vehicle.
When the PCM’s internal components degrade from years of heat cycles and vibration, it can no longer make the precise calculations needed for optimal engine performance and fuel economy. This isn’t just an annoyance; it can leave you stranded. This replacement 1999-2000 Yukon PCM is the definitive solution to get your vehicle running like it should. We eliminate the biggest hurdle in PCM replacement: programming. Simply provide us with your vehicle’s VIN during checkout, and our experts will flash the module with the latest official GM software specific to your vehicle. It arrives at your door ready to install, saving you a costly and time-consuming trip to the dealership.
Case Study: The Intermittent Stall
A customer brought in a 2000 Yukon Denali with a frustrating problem: it would randomly stall at stoplights, but not always. There were no consistent trouble codes, just an occasional generic communication error. We checked fuel pressure, ignition components, and sensors—all were fine. After spending hours on diagnostics, my gut told me to look at the PCM. On these models, heat soak can cause microscopic cracks in the circuit board, leading to intermittent failures. We swapped in one of our pre-programmed PCMs, and the problem vanished instantly. The customer went from being ready to sell the truck to having his reliable daily driver back. That’s the difference a quality, correctly programmed module makes.
Is Your Vehicle Showing These Signs of a Bad PCM?
- ✔ Persistent Check Engine Light (CEL) that won’t go away.
- ✔ Stored diagnostic trouble codes (DTCs) like P0601 (Internal Memory Error) or P0606 (PCM Processor Fault).
- ✔ The engine cranks but refuses to start (no-start condition).
- ✔ Rough or erratic idling and stalling.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Harsh or delayed automatic transmission shifting.
- ✔ Failure to pass state emissions testing.
A Straightforward Guide to Installation
- ✔ Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- ✔ Locate the PCM: On most compatible trucks and SUVs (like the Yukon, Tahoe, Silverado), the PCM is in the engine bay, typically on the driver’s side fender well or near the battery. On Express/Savana vans, it’s often in the rear of the engine compartment.
- ✔ Disconnect Connectors: Carefully unclip the wiring harness connectors from the old PCM. There are usually multiple connectors with locking tabs; be gentle to avoid breaking them.
- ✔ Remove the Old Module: Unbolt the old PCM from its mounting bracket. Keep the hardware as you will reuse it.
- ✔ Install the New Module: Mount your new, pre-programmed PCM onto the bracket and securely fasten it.
- ✔ Reconnect Everything: Firmly plug the wiring harnesses into the new module until they click into place. Reconnect the negative battery terminal.
- ✔ Final Step: In some cases, a security relearn procedure may be necessary. This can typically be done without special tools by cycling the key. Your vehicle is now ready to go!
Will This Fit My Vehicle?
This module is a direct replacement for part numbers 16263494, 16265035, and 8162634940. It is guaranteed to be compatible with the following vehicles, provided you match the options listed:
Chevrolet: Tahoe (99-00), Silverado/Chevrolet Pickup (99-00), Suburban (99), Express Van (99-02), Astro Van (99-01), Blazer S10 (98-00), S10 Pickup (98-00)
Cadillac: Escalade (99-00)
Oldsmobile: Bravada (98-00)
Isuzu: Hombre (98-00)
Note: Please review the full compatibility list in the product details to confirm specific engine and build date options for your exact model. A correct match is essential for proper function. This is the correct 1999-2000 Yukon PCM for many applications.
Frequently Asked Questions
Do I need to have this module programmed by a dealer?
No! That’s the best part. We program the module to your vehicle’s specific VIN before we ship it. It arrives ready for installation, saving you time and money.
What is a VIN and where do I find it?
The VIN is your Vehicle Identification Number, a unique 17-digit code. You can find it on your driver’s side dashboard (viewable through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.
What if my original part number is slightly different?
This module replaces several part numbers, including 16263494, 16265035, and 8162634940. As long as your vehicle is on our compatibility list and your original module is one of these numbers, this part will work perfectly.
Is this a simple plug-and-play installation?
Yes, for the most part. Once you swap the physical module, the pre-programming handles the software side. Some vehicles may require a simple security relearn procedure, which involves a few key cycles and does not require a scan tool.
Will this fix my transmission problems?
If your transmission issues, like hard or erratic shifting, are caused by faulty signals from the PCM, then yes, this will resolve them. The PCM controls both engine and transmission functions, so a failing module is a very common cause of these symptoms.