Restore Peak Performance to Your GM Truck or Van
Is your truck or van suffering from frustrating issues like a persistent check engine light, rough idling, stalling, or a complete no-start condition? These are classic signs of a failing Powertrain Control Module (PCM), the central computer that manages your vehicle’s engine and transmission. This replacement PCM is the definitive solution to restore your vehicle’s reliability, fuel efficiency, and drivability. It arrives at your door pre-programmed with the latest GM software updates, specifically matched to your vehicle using your VIN. This eliminates the need for an expensive trip to the dealership for programming.
From the Diagnostic Bay
I once had a 2000 Chevy Express van come in that had its owner chasing his tail for weeks. The van would randomly stall at stoplights and had a terrible hesitation on acceleration. The owner had already replaced the throttle position sensor, the idle air control valve, and even the fuel pump based on advice from forums. When we hooked up our professional scan tool, we saw erratic data from multiple sensors, but they all tested fine individually. The real culprit was the PCM’s internal processor, which was failing under heat. Installing a correctly programmed PCM, like this one, solved all the issues in one go. It’s a reminder that when multiple, seemingly unrelated electronic issues pop up, the problem often lies with the central computer.
Is Your Vehicle Showing These Symptoms?
- ✔ Persistent Check Engine Light (CEL) with various trouble codes.
- ✔ Engine stalling, stumbling, or hesitating during acceleration.
- ✔ Rough or inconsistent idle.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Complete no-start condition where the engine cranks but won’t fire.
- ✔ Failure to communicate with diagnostic scan tools.
The Importance of a Pre-Programmed 1999-2000 Sierra 1500 PCM
The Powertrain Control Module is not a simple plug-and-play part from the factory. Each module is programmed with specific software tailored to your vehicle’s engine, transmission, and emissions equipment. Our service takes the guesswork and hassle out of the replacement process. By providing us with your Vehicle Identification Number (VIN) at checkout, you receive a module that is ready for installation. This 1999-2000 Sierra 1500 PCM will have the most current GM-approved software, which can often resolve underlying drivability issues that were present even before the original module failed. This ensures optimal performance and longevity for your vehicle.
This module is a direct replacement for multiple service numbers, including 16263494, 16265035, and 8162634940. It fits a wide array of GM trucks and vans from the late 1990s and early 2000s, making it a versatile and reliable solution for many owners.
Installation and Setup
Physical installation is straightforward. The PCM is typically located in the engine bay, often on the driver’s side fender or near the battery. After disconnecting the battery, you can unbolt the old module, disconnect the wiring harnesses, and install the new one. Once installed and the battery is reconnected, your vehicle should start and run. In some cases, a Crankshaft Variation Relearn procedure (also known as a CASE relearn) may be necessary to clear certain trouble codes related to engine misfires. This procedure can be performed by most professional scan tools.
Frequently Asked Questions
What is a PCM and what does it do?
The Powertrain Control Module (PCM) is your vehicle’s main computer. It controls all aspects of engine and transmission operation, including fuel injection, ignition timing, and shift points, to ensure optimal performance, fuel economy, and emissions.
Do I need to have this module programmed?
No. This module comes pre-programmed to your vehicle’s specific VIN. Simply provide us with your 17-digit VIN when you order, and we handle all the programming before it ships. It’s ready to install right out of the box.
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to access the exact factory software and calibration files for your specific vehicle. This ensures perfect compatibility with your engine, transmission, and all factory options.
Will this fix my check engine light?
If the check engine light is caused by a faulty PCM, then yes, this part will resolve the issue. However, it’s important to properly diagnose the vehicle first, as the light can be triggered by other failing components like sensors or wiring.
Is any other procedure required after installation?
In many cases, no further steps are needed. However, some GM vehicles may require a Crankshaft Variation Relearn (CASE relearn) to be performed with a compatible scan tool to prevent a P1336 trouble code. This is a simple procedure for any qualified mechanic.
How can I be sure this fits my vehicle?
This module is compatible with part numbers 16263494, 16265035, and 21811787. Please check the extensive fitment list on this page and match the part number on your original module to ensure compatibility.