Is your 1999-2000 GMC Yukon, Chevrolet Tahoe, or other GM truck experiencing baffling electrical gremlins, poor performance, or a persistent check engine light? The Powertrain Control Module (PCM), the central computer for your engine and transmission, is often the culprit. A failing PCM can lead to a cascade of issues that can be difficult to diagnose, from rough idling and stalling to erratic shifting and a frustrating no-start condition. This replacement PCM, part number 16263494, is the definitive solution to restore your vehicle’s reliability and performance to factory specifications.
Unlike generic modules that require an expensive trip to the dealership for programming, this unit arrives at your door ready for installation. We take your vehicle’s unique Vehicle Identification Number (VIN) and flash the module with the latest, most stable software updates directly from GM. This ensures perfect communication between all of your vehicle’s systems, optimizes fuel economy and emissions, and corrects common software-related drivability issues that may have been present even before your original module failed. It’s a direct-fit, plug-and-play solution designed to get you back on the road with confidence.
From the Diagnostic Bay
We had a 2000 Chevy Express van come in that was driving the owner crazy. It would start and run fine for a week, then suddenly refuse to start for two days. No rhyme or reason. The fuel pump was good, spark was there, but it just wouldn’t fire. After hours of chasing wires and testing sensors, we finally focused on the PCM. On a hunch, we swapped in a known-good programmed module, and the van fired up instantly. The original PCM had an internal intermittent fault in the injector driver circuit that only showed up when it felt like it. Replacing the PCM with a properly programmed unit like this one was the only permanent fix.
Diagnosing Your 1999-2000 Yukon PCM Failure
The PCM is the brain of your vehicle’s powertrain. When it begins to fail, the symptoms can be widespread and sometimes misleading. If you’re experiencing several of the issues below, there’s a strong probability your PCM is at the end of its service life. This module is a direct replacement for a wide variety of GM trucks and vans, including the Chevrolet Silverado, S10, Suburban, Express, GMC Sierra, Savana, and Cadillac Escalade. Always verify your original part number for a perfect match.
Common Symptoms of a Failing PCM
- ✔ Persistent Check Engine Light (CEL) with various fault codes.
- ✔ Engine stalling or shutting off unexpectedly while driving.
- ✔ Rough or erratic engine idle.
- ✔ Harsh or delayed automatic transmission shifting.
- ✔ A noticeable drop in fuel economy.
- ✔ Vehicle enters ‘limp mode’ with reduced power.
- ✔ Complete no-start condition where the engine cranks but won’t fire.
- ✔ Communication errors with diagnostic scan tools.
Don’t let a faulty computer keep your reliable GM truck off the road. By providing us with your VIN, you guarantee that the module you receive is perfectly matched to your vehicle’s specific configuration, including engine size, transmission type, and emissions equipment. This eliminates guesswork and ensures a smooth installation process. Restore the performance and dependability you expect from your vehicle today.
Frequently Asked Questions
Why do you need my VIN to program the module?
Your Vehicle Identification Number (VIN) contains critical information about your truck’s specific build, including engine type, transmission, emissions systems, and other factory options. Programming the PCM with your VIN ensures it has the correct software and calibration files to operate your vehicle exactly as the manufacturer intended, preventing compatibility issues.
Is any additional programming required after installation?
In most cases, this module is a plug-and-play solution. However, some GM vehicles of this era may require a security relearn procedure (such as for the Passlock or VATS anti-theft system) or a Crankshaft Variation Relearn (CASE relearn). These procedures can often be performed without special tools and instructions are widely available.
Will this PCM fix my vehicle’s specific problem?
This PCM will correct any issue directly caused by a faulty original module. While the symptoms listed are common for PCM failure, it’s essential to ensure your vehicle’s underlying mechanical and electrical systems are in good working order. This module is a solution for a failed computer, not for other faulty sensors or components.
Where is the PCM located on my vehicle?
The location varies slightly by model. On many trucks like the Yukon, Tahoe, and pickups, it’s in the engine compartment, often on the driver’s side fender or near the battery. On vans like the Express and Savana, it is frequently found in the rear of the engine compartment on the driver’s side. Always disconnect the battery before attempting removal or installation.
What part numbers does this module replace?
This module is a direct replacement for service numbers 16263494, 16265035, and 8162634940. It is a compatible solution for many GM vehicles built between 1998 and 2002. Please check the detailed fitment list to confirm it is correct for your specific model and year.