Is Your GM Truck or Van Running Rough?
The Powertrain Control Module, or PCM, is the central computer of your vehicle. It’s the brain behind the operation, managing everything from fuel injection and ignition timing to transmission shift points and emissions controls. When the PCM begins to fail, it can cause a wide range of frustrating and difficult-to-diagnose issues. You might be chasing symptoms by replacing sensors and other parts, only to find the root cause is the module itself. This is especially common in hardworking vehicles like the Chevrolet Express, GMC Savana, Silverado, and Sierra from the late 90s and early 2000s.
From the Diagnostic Bay
We had a 2000 Chevy Silverado 1500 in the shop that was driving the owner crazy. It would randomly stall at stoplights, but only when warm. It threw intermittent misfire codes that would disappear. The owner had already replaced the spark plugs, wires, and even the fuel pump. After hours of diagnostics, we hooked up a scope to the PCM outputs and found the injector driver for cylinder 3 was dropping out erratically. A new, properly programmed PCM fixed the issue instantly. It’s a reminder that when nothing else makes sense, the computer is often the culprit.
Symptoms of a Failing Powertrain Control Module
- ✔ Unexplained Check Engine Light (CEL) illumination.
- ✔ Engine stalling, stumbling, or hesitating during acceleration.
- ✔ Rough or erratic idling.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh or incorrect automatic transmission shifting.
- ✔ Failure to pass state emissions inspections.
- ✔ Vehicle entering ‘limp mode’ with reduced power.
- ✔ Complete no-start condition where the engine cranks but won’t fire.
The Direct-Fit Solution: A Pre-Programmed Savana 2500 PCM
Don’t let a faulty computer keep your truck off the road. This Powertrain Control Module is the definitive solution for your 1999-2002 GMC Savana 2500 and a wide range of other GM vehicles. The biggest hurdle in replacing a PCM is the required programming—a step that often means a costly trip to the dealership. We eliminate that problem entirely. When you purchase this module, we use the Vehicle Identification Number (VIN) you provide to flash it with the latest, most up-to-date factory software directly from GM. This ensures perfect compatibility and optimal performance for your specific vehicle configuration.
This module is a direct replacement for multiple part numbers, including 16263494, 16265035, 8162634940, 218-11787, and 21811787. By providing your VIN, you guarantee that the unit you receive is ready for installation right out of the box, restoring the precise engine and transmission management your vehicle had when it was new.
Frequently Asked Questions
Do I need to get this PCM programmed by a dealer?
No. The main benefit of our service is that we program the module for you before shipping. Simply provide your vehicle’s VIN during or after checkout, and it will arrive ready to install.
What happens if I install it without programming?
An unprogrammed module will not work correctly. It lacks the specific data for your vehicle’s engine, transmission, and options. In most cases, the vehicle will not start due to the anti-theft system (PassLock/VATS). Our pre-programming service handles all of this for you.
Where is the PCM located on my 1999-2002 Savana 2500 Van?
On most GM vans like the Savana and Express, the PCM is located in the engine compartment on the driver’s side, often near the rear of the engine bay. On pickups like the Silverado or S10, it can be on the driver’s side inner fender or under the battery tray. Always disconnect the battery before removal or installation.
Will I need to perform any other procedures after installation?
In some cases, you may need to perform a Crankshaft Position System Variation Learning Procedure, also known as a CASE relearn. This can be done with a capable bi-directional scan tool and is sometimes required to clear certain trouble codes after PCM replacement. Many vehicles do not require this step.
How do I provide my VIN?
You can add your VIN in the notes section during checkout or send us a message with your order number after you complete your purchase. We cannot ship your order until we have your VIN to ensure correct programming.