Restore Peak Performance to Your GM Truck or Van
Is your 1999-2002 GMC Savana 3500, Chevrolet Express, or other compatible GM vehicle suffering from erratic engine behavior, poor fuel economy, or transmission shifting problems? The Powertrain Control Module (PCM), often called the Electronic Control Module (ECM), is the central computer of your vehicle. It meticulously manages engine timing, fuel delivery, transmission shift points, and emissions systems. When it fails, it can cause a cascade of frustrating and difficult-to-diagnose issues. This direct-fit replacement PCM, part number 8162634940, is the definitive solution to restore your vehicle’s reliability and drivability.
From the Diagnostic Bay
We had a 2001 Chevy Express 2500 come into the shop with a complaint of harsh, unpredictable shifting and a check engine light. The owner had already replaced the transmission speed sensor and was considering a costly transmission rebuild. After hooking up our scanner, we saw erratic data coming from the PCM and communication errors with the transmission module. Instead of a mechanical failure, the PCM itself was the culprit. We installed a VIN-programmed module just like this one, performed the security relearn, and the van drove like new. It saved the customer thousands and highlights how critical a properly functioning PCM is to the entire powertrain.
Symptoms of a Failing 1999-2002 Savana 3500 PCM
A failing powertrain control module can manifest in various ways, often mimicking other component failures. If you’re experiencing any of the following, your PCM could be the root cause:
- ✔ Check Engine Light: The most common indicator, often with codes related to sensors, emissions, or internal module failure.
- ✔ Engine Stalling or Misfiring: The engine may stall unexpectedly, run rough, or misfire as the PCM fails to properly control spark and fuel.
- ✔ No-Start Condition: A completely failed PCM can prevent the engine from starting at all by failing to activate the fuel pump or ignition system.
- ✔ Poor Fuel Economy: Incorrect fuel mixture and timing calculations can lead to a sudden and significant drop in MPG.
- ✔ Erratic Transmission Shifting: The PCM controls transmission solenoids, and a faulty module can cause harsh shifts, delayed engagement, or getting stuck in one gear.
- ✔ Failure to Communicate: Your mechanic’s diagnostic scan tool may be unable to connect with the PCM, a clear sign of an internal fault.
The Plug-and-Play Solution
Don’t settle for a generic, unprogrammed module that requires expensive dealership tools for setup. We take the guesswork out of the repair. When you purchase this module, you provide us with your vehicle’s VIN. Our technicians will then program the unit with the latest GM-certified software specific to your vehicle’s configuration. This ensures that all systems—engine, transmission, and anti-theft—are correctly calibrated right out of the box. While a security relearn procedure may be necessary upon installation (a simple process you can often do yourself), the core programming is complete, saving you time and money.
This module is a direct replacement for multiple part numbers, including 16263494, 16265035, and 218-11787, and fits a wide array of GM trucks and vans from 1998 to 2002. Please verify your part number and check the extensive fitment list to ensure compatibility.
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to program the PCM with the exact software and calibrations your specific vehicle requires. This includes engine size, transmission type, emissions equipment, and other options, ensuring a perfect match and proper function.
Is this part difficult to install?
Physically replacing the PCM is typically straightforward. It’s usually located in the engine bay and held in by a few bolts. After installation, you will likely need to perform a security relearn procedure (often called a CASE learn or Passlock relearn), which pairs the new PCM to your vehicle’s anti-theft system. Instructions for this are widely available online or in service manuals.
Will this fix my check engine light?
If the check engine light is caused by a faulty PCM, then yes, this replacement part will resolve the issue. However, it’s crucial to properly diagnose the problem first. If the light is on due to a bad sensor or another component, replacing the PCM will not fix it.
What is the difference between a PCM and an ECM?
The terms are often used interchangeably. ECM stands for Engine Control Module, while PCM stands for Powertrain Control Module. A PCM is a more advanced type of ECM that controls both the engine and the transmission, which is standard on most vehicles this module fits.
How do I know if my original part number matches?
Your original module will have a sticker with the part number on it. This module is a direct replacement for several part numbers, including 16263494, 16265035, 8162634940, and 218-11787. As long as your original part number is on our compatibility list, this module will work for you.