Is Your GM Truck or Van Running Rough?
If you’re dealing with frustrating issues like a persistent check engine light, erratic engine behavior, poor fuel economy, or harsh transmission shifting, the root cause is often a failing Powertrain Control Module (PCM). As the central computer of your vehicle, the PCM is responsible for managing everything from fuel injection and ignition timing to transmission shift points and emissions controls. When it begins to fail, it can create a cascade of problems that are difficult to diagnose and can leave your vehicle unreliable or even undrivable.
This replacement Powertrain Control Module is the definitive solution for a wide range of popular GM trucks and vans from the late 90s and early 2000s, including the GMC Safari, Chevy Astro, Express, Silverado, and many more. Don’t let a faulty computer keep your workhorse off the road. This module restores the precise communication and control your vehicle needs to operate as it did from the factory.
Diagnosing a Faulty 1999-2001 GMC Safari PCM
A failing PCM can manifest in numerous ways, often mimicking other sensor or component failures. If you’ve replaced sensors and chased down wiring issues with no success, it’s time to consider the main computer. A faulty module can store false trouble codes, send incorrect signals, or fail to communicate altogether, making proper diagnosis a challenge for even seasoned mechanics. Our direct replacement module eliminates the guesswork.
Common Symptoms of a Failing PCM
- ✔ Persistent Check Engine Light (CEL) that won’t clear or returns immediately.
- ✔ Engine stalling, stumbling, or misfiring for no apparent reason.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ A noticeable drop in fuel economy.
- ✔ The vehicle fails to start, even with a good battery and starter.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Multiple unrelated trouble codes being stored in memory.
Plug-and-Play Solution with VIN Programming
What sets this module apart is our professional programming service. Before we ship your part, we flash it with the latest, most up-to-date software directly from GM, tailored specifically to your vehicle’s Vehicle Identification Number (VIN). This critical step ensures that the module has the correct parameters for your engine, transmission, and factory options. This eliminates the need for an expensive trip to the dealership for programming. Once you receive the module, installation is straightforward. In most cases, after installation, you will only need to perform a simple security relearn procedure (often called a CASE relearn or anti-theft relearn), which can be done without special tools. This process syncs the new PCM with your vehicle’s anti-theft system.
This module is a direct replacement for multiple part numbers, including 16263494, 16265035, and 8162634940. By providing your VIN at checkout, you guarantee you receive a perfectly matched and updated computer for your specific application, restoring performance and reliability.
Frequently Asked Questions
What do I need to do after I purchase?
After placing your order, you must provide us with your vehicle’s 17-digit VIN. We cannot program and ship the module without it. You can typically send this through the order messaging system.
Is this part difficult to install?
The physical installation is typically simple. It involves disconnecting the battery, unplugging the electrical connectors from the old module, unbolting it, and then installing the new one in reverse order. The most important step after installation is the security relearn procedure, which varies slightly by model but instructions are widely available online.
Will this fix my vehicle’s specific problem?
This PCM is a solution for issues caused by a faulty module. While it resolves the common symptoms listed, we always recommend a proper diagnosis by a qualified mechanic to confirm the PCM is the point of failure before ordering.
Do I need to send my old PCM back?
This listing does not require a core return. You can keep your old part.
How do I know if this fits my vehicle?
This module fits a very wide range of GM vehicles. Please review the detailed fitment list on this page. The most crucial step is providing your VIN, as we will program it to match your exact vehicle build, ensuring compatibility.