Restore Peak Performance to Your GM Truck or SUV
Is your 1999-2000 Chevrolet Tahoe, Suburban, or GMC Yukon suffering from baffling electrical issues, poor engine performance, or erratic transmission shifting? The Powertrain Control Module (PCM), often called the Engine Control Module (ECM), is the central computer of your vehicle. When it fails, it can cause a cascade of problems that are often misdiagnosed, leading to wasted time and money on unnecessary parts. This replacement PCM, part number 16265035, is the definitive solution to restore your vehicle’s factory performance and reliability.
This isn’t just a generic, off-the-shelf part. We provide a fully programmed module tailored specifically to your vehicle. Upon purchase, you simply provide us with your vehicle’s 17-digit Vehicle Identification Number (VIN). Our technicians will then flash the module with the latest, most stable software updates directly from General Motors. This ensures perfect compatibility with your engine, transmission, and all factory options, eliminating the need for an expensive trip to the dealership for programming.
From the Diagnostic Bay
A customer brought in his 2000 Chevy Silverado with the 4.3L V6, complaining of a harsh 1-2 shift and a persistent check engine light for a transmission solenoid code. He had already replaced the solenoid twice and even had the transmission fluid flushed, all to no avail. The problem was intermittent but frustrating. After hooking up our professional scan tool, we noticed the PCM was commanding the shift pressure erratically. The module itself was failing internally, sending incorrect signals. We installed a VIN-programmed PCM, performed the quick security relearn, and the truck shifted like it just rolled off the assembly line. It’s a classic case where the root cause was the computer, not the mechanical parts it controls.
Is Your 1999-2000 Tahoe PCM Failing?
A faulty powertrain control module can manifest in numerous ways. If your vehicle is experiencing any of the following symptoms, a failing PCM could be the culprit. Replacing it can resolve these frustrating and potentially damaging issues.
- ✔ Check Engine Light is on with various or no specific codes
- ✔ Engine cranks but refuses to start
- ✔ Rough or unstable idling
- ✔ Poor fuel economy
- ✔ Harsh or delayed automatic transmission shifting
- ✔ Misfire codes (e.g., P0300) even after replacing plugs and wires
- ✔ Loss of communication with the diagnostic scan tool
- ✔ Vehicle stalls intermittently for no apparent reason
The Importance of VIN Programming
In modern vehicles, the PCM is more than just a simple controller; it’s integrated with the anti-theft system (Passlock/VATS), transmission controls, and emissions equipment. A module from another vehicle will not work correctly, as it’s coded to a different VIN and option set. Our VIN programming service ensures that the module you receive is a true plug-and-play solution. It correctly identifies your vehicle’s specific configuration, from engine size to axle ratio, guaranteeing seamless operation. This process is critical for proper engine function, transmission strategy, and preventing anti-theft system lockouts.
This module is a direct replacement for several part numbers, including: 16263494, 16265035, 8162634940, 218-11787, and 21811787. Please verify your original part number to ensure compatibility, or contact us with your VIN, and we can confirm the correct fitment for you.
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to program the PCM with the exact software and calibrations for your specific vehicle’s engine, transmission, and options. This ensures the module works perfectly right out of the box.
Is this part difficult to install?
Installation is straightforward for anyone with basic mechanical skills. The module is typically located in the engine bay. After swapping the physical unit, you may need to perform a simple security relearn procedure, which takes about 30 minutes and does not require special tools. Instructions are readily available online.
Will this fix my check engine light?
If the check engine light and associated codes are caused by a failing PCM, then yes, this replacement module will resolve the issue. It’s crucial to properly diagnose the problem first, as the light can be triggered by many other components like sensors or wiring.
What is the security relearn procedure?
The security relearn, or VATS/Passlock relearn, syncs the new PCM with your vehicle’s anti-theft system. It typically involves turning the key to the ‘ON’ position for 10 minutes, then ‘OFF’ for 10 seconds, and repeating this cycle three times. This allows the components to communicate and authorize the new module.
Is this a new or used part?
This is a high-quality, fully tested replacement part that has been programmed with the latest GM software for your vehicle. It is guaranteed to meet or exceed original equipment performance.