Is Your 1999-2000 Escalade or GM Truck Running Rough or Not Starting?
If you’re dealing with a frustrating no-start condition, a persistent check engine light, erratic engine performance, or harsh transmission shifting, the problem often points directly to a failing Powertrain Control Module (PCM). As the central computer for your engine and transmission, when the PCM begins to fail, it can create a cascade of confusing and difficult-to-diagnose issues. You’re not just buying a part; you’re restoring the core functionality and reliability of your vehicle.
From the Shop Floor: A Real-World Diagnosis
“A customer’s 2000 GMC Yukon Denali, which uses this exact same PCM, came in on a tow truck last week. It would crank but wouldn’t start, and when it occasionally did, it ran terribly and the transmission would shift hard into gear. The owner had already replaced the fuel pump and crank sensor. After plugging in my scan tool, I found a ‘No Communication with PCM’ error. That’s a classic sign. We traced the power and grounds to the moduleโthey were perfect. The internal processor on the original PCM had simply failed from years of heat and vibration. Installing one of our pre-programmed modules had it running smoothly in under 20 minutes.”
Common Symptoms of a Failing GM Powertrain Control Module
Over my 20 years in the garage, I’ve seen hundreds of these specific ‘black box’ PCMs fail. The symptoms are often consistent across the wide range of trucks and vans they’re used in. Look out for:
- โ Check Engine Light (CEL) is on with various communication or sensor codes.
- โ The engine cranks but refuses to start.
- โ Rough or unstable idling.
- โ Poor fuel economy and loss of power.
- โ Harsh or erratic automatic transmission shifting.
- โ The vehicle stalls intermittently while driving.
- โ Inability for a scan tool to communicate with the PCM.
The Brain of Your Operation: The Right Solution
Don’t let a faulty computer keep your truck off the road. This Powertrain Control Module is the definitive solution to these problems. The most significant advantage we offer is our professional programming service. Before we ship the module, we flash it with the latest official GM software updates, precisely matched to your vehicle’s 17-digit Vehicle Identification Number (VIN). This critical step ensures that the module works seamlessly with your specific engine, transmission, and options, eliminating the need for an expensive trip to the dealership for programming.
- โ Programmed for You: Arrives ready to install, pre-programmed to your specific VIN.
- โ Solves Common Issues: Directly addresses no-start, poor performance, and CEL problems caused by a faulty PCM.
- โ Latest GM Software: We load the newest calibrations to improve performance and efficiency over the original software.
- โ Simple Installation: Designed for a direct, plug-and-play installation process.
Installation and Compatibility
Installation is straightforward for a DIY mechanic. Simply disconnect the vehicle’s battery, locate your existing PCM (often on the driver’s side in the engine bay, sometimes under the battery tray), disconnect the color-coded electrical connectors, unbolt the old unit, and install this one in its place. After installation, you may need to perform a simple security relearn or Crankshaft Variation (CASE) relearn procedure, which can often be done without special tools.
This module is a direct replacement for several part numbers, ensuring wide compatibility. If your original module has one of the following numbers, this part is a guaranteed match:
- โ 16265035
- โ 16263494
- โ 8162634940
- โ 218-11787
- โ 21811787
While this listing is for the 1999-2000 Escalade, this PCM is also the correct computer for a vast range of GM trucks and vans from approximately 1998-2002, including the Chevrolet Silverado, GMC Sierra, Tahoe, Yukon, Suburban, S10/Blazer, and Express/Savana vans. Please verify the part number on your original module to confirm fitment.