Restore Peak Performance to Your GM Truck or Van
Is your Chevrolet Express, Silverado, GMC Sierra, or another GM vehicle from the late 90s and early 2000s suffering from perplexing issues? Problems like erratic shifting, a persistent check engine light, stalling, or poor fuel economy often point to a failing Powertrain Control Module (PCM). As the central computer for your engine and transmission, a faulty PCM can cause a wide range of frustrating and performance-robbing symptoms. This replacement PCM, part number 8162634940, is the definitive solution to restore your vehicle’s reliability and drivability.
From the Diagnostic Bay
We recently had a 2001 Savana work van come into the shop with a complaint of harsh 1-2 shifts and intermittent stalling at stoplights. The owner had already replaced the transmission fluid and filter with no improvement. Our scan tool revealed a P0601 code (Internal Control Module Memory Check Sum Error). After verifying all power and ground connections to the module were solid, we confirmed the original PCM was failing internally. We installed one of these pre-programmed modules, performed a quick security relearn, and the van was shifting smoothly and running perfectly. It saved the owner a costly trip to the dealership and got his work van back on the road the same day.
Is Your Vehicle Exhibiting These Symptoms?
A failing PCM can manifest in numerous ways. If you’re experiencing any of the following, it’s a strong indicator that your engine computer may need replacement:
- ✔ Persistent Check Engine Light (CEL) with codes related to internal module failure (e.g., P0601, P0606).
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Unexplained drop in fuel economy.
- ✔ Engine stalling, stumbling, or running rough.
- ✔ Difficulty starting the vehicle or a no-start condition.
- ✔ Failure to pass state emissions testing.
- ✔ Communication errors when trying to use a diagnostic scan tool.
The Right Solution: A Programmed 1999-2002 Express PCM
Don’t settle for a generic, unprogrammed module that requires an expensive trip to the dealership. We simplify the repair process by programming this module specifically for your vehicle before it ever leaves our facility. Using your vehicle’s unique Vehicle Identification Number (VIN), we flash the unit with the latest, most stable software updates directly from GM. This ensures that all factory parameters for your engine, transmission, and emissions systems are perfectly calibrated. This module is a direct replacement for multiple part numbers, including 16263494, 16265035, 8162634940, and 218-11787.
This attention to detail means a smoother installation process and the restoration of your vehicle’s original performance and efficiency. By providing us with your VIN upon purchase, you receive a component that is truly ready for installation, minimizing downtime and eliminating the need for specialized programming 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, emissions systems, and automatic transmission shift points to ensure optimal performance, fuel economy, and low emissions.
Is this part difficult to install?
The physical installation is straightforward for most DIY mechanics. It typically involves disconnecting the battery, unplugging the electrical connectors, and unbolting the old module to replace it with the new one. Since we pre-program the module, you avoid the most complex part of the job.
Do I need to do anything after installing this module?
In many cases, it is a plug-and-play installation. However, some GM vehicles of this era may require a security relearn procedure (often called a CASE learn or Passlock relearn) to sync the new PCM with your vehicle’s anti-theft system. This can often be done without special tools, or by a qualified mechanic with a capable scan tool.
How do I provide my VIN?
After you complete your purchase, you will receive instructions on how to send us your 17-digit VIN. You can typically find your VIN on the driver’s side dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.
Will this fix my check engine light?
If the check engine light is on due to an internal failure of the original PCM, this replacement module will resolve the issue. It is crucial to properly diagnose the vehicle first to ensure the PCM is the root cause of the problem and not a faulty sensor or wiring issue.