Restore Peak Performance to Your GM Truck or SUV
Is your 1999-2000 GMC Yukon, Chevy Tahoe, or other GM vehicle running rough, stalling, or showing a persistent Check Engine Light? As a technician with over two decades of experience, I’ve seen firsthand how a failing Powertrain Control Module (PCM) can cause a cascade of frustrating and hard-to-diagnose issues. The PCM is the brain of your engine and transmission, and when it starts to fail, you’ll notice everything from poor fuel mileage and harsh shifting to a complete no-start condition. This isn’t just an inconvenience; it’s a critical component for your vehicle’s reliability and safety.
This replacement 1999-2000 Yukon PCM is the definitive solution to these problems. We take the guesswork and hassle out of the repair by programming the module specifically to your vehicle’s VIN before it ever leaves our facility. This process installs the latest, most stable software updates from General Motors, often correcting underlying drivability issues that were present even in the original factory programming. You get a reliable part that’s ready for installation right out of the box, saving you a costly trip to the dealership for programming.
A Technician’s Notebook
I remember a 2000 Chevy Silverado 2500 that came into the shop with an intermittent no-start and random stalling that had stumped two other mechanics. The owner was ready to sell the truck. There were no consistent trouble codes, just a general feeling of unreliability. After checking the basics—fuel pressure, spark, and battery—I focused on the PCM. On these GMT400 and early GMT800 platforms, the PCM is often mounted in the engine bay where it’s exposed to intense heat and vibration. Over 15+ years, the internal solder joints and processors can develop micro-fractures. We swapped in a VIN-programmed PCM, performed the security relearn, and the truck ran perfectly. It’s a fix I’ve performed hundreds of times; that simple module restored the owner’s confidence in his vehicle.
Is Your GM Truck or Van Showing These Signs?
A faulty PCM can manifest in many ways. If you’re experiencing any of the following, a failing computer is a likely culprit:
- ✔ Check Engine Light is on with codes like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (PCM Processor Fault).
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained drops in fuel economy.
- ✔ The transmission shifts harshly, late, or erratically.
- ✔ The engine stalls, hesitates, or misfires for no apparent reason.
- ✔ Failure to pass an emissions/smog test.
- ✔ Loss of communication with the diagnostic scan tool.
A Straightforward Guide to Installation
Installing your new PCM is a job most DIYers can handle in under an hour with basic hand tools. This gets you back on the road without the high labor costs of a repair shop.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the PCM: On most trucks and SUVs like the Yukon or Tahoe, it’s in the engine compartment, typically on the driver’s side fender or near the battery. On Express/Savana vans, it’s often in the LH rear engine compartment.
- Disconnect the Connectors: Carefully unclip the wiring harness connectors. These GM connectors have locking tabs that need to be released before pulling. Never force them.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket and remove it from the vehicle.
- Install the New PCM: Mount your new, pre-programmed module in place and securely tighten the bolts. Reconnect the wiring harnesses, ensuring they click firmly into place.
- Reconnect the Battery: Attach the negative battery terminal.
- Perform Security Relearn (CRITICAL): You must perform the GM security relearn procedure. This syncs the new PCM with your vehicle’s anti-theft system. It’s a simple process that typically involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’, and repeating two more times. Your vehicle will not start until this is completed.
Verified Vehicle Compatibility
This module, identified by part number 16263494, is a direct replacement for a wide range of GM vehicles. Please match your part number or vehicle from the list below to ensure proper fitment. This unit is also a direct replacement for part numbers 16265035, 8162634940, 218-11787, and 21811787.
This module fits various 1998-2002 Chevrolet, GMC, Cadillac, Oldsmobile, and Isuzu models including:
Trucks: Silverado/Sierra 1500/2500/3500, S10/S15/Sonoma, Isuzu Hombre.
SUVs: Tahoe/Yukon, Suburban, Escalade, Blazer/Jimmy, Bravada, Envoy.
Vans: Express/Savana 1500/2500/3500, Astro/Safari.
Note: Compatibility may depend on specific options like engine size (4.3L, 5.0L, 5.7L), build dates (opt ZN4), or matching the ID 16263494. Please verify with your vehicle’s original part.
Frequently Asked Questions
Do I need to program this 1999-2000 Yukon PCM?
No. We handle the programming for you. Simply provide your vehicle’s 17-digit VIN during or after checkout, and we will flash the module with the latest GM software specific to your truck before shipping.
What is the security relearn procedure?
It’s a required anti-theft synchronization process that you can do yourself without any special tools. The most common method is the ’10-minute relearn,’ which involves cycling the ignition key. We include instructions to make it easy.
Will this fix my check engine light and emissions problems?
If the check engine light is caused by an internal PCM failure (like code P0601), this module is the correct fix. By restoring proper engine and emissions system control, it will allow your vehicle to pass a smog test.
How do I find my original part number?
The part number is printed on a sticker on your original PCM. It will typically be a prominent 8-digit number, such as 16263494. Matching this number is the best way to guarantee compatibility.
Is this a simple plug-and-play installation?
Almost. It’s a direct physical replacement, and the programming is done for you. The only extra step is the security relearn procedure, which is essential for the vehicle to start and run with the new module.