Restore Peak Performance to Your GM Truck or Van
The Powertrain Control Module (PCM), often called the Engine Control Module (ECM), is the central computer of your vehicle’s engine and transmission. It meticulously manages fuel delivery, ignition timing, transmission shift patterns, and emissions controls. When this critical component begins to fail in your Chevrolet Express, GMC Savana, Silverado, or other compatible GM vehicle, it can lead to a cascade of frustrating and performance-robbing issues. This replacement PCM is the definitive solution to restore your vehicle’s original drivability, efficiency, and reliability.
Unlike generic modules that require expensive dealer programming, this unit arrives at your door completely programmed to your specific vehicle. We use your Vehicle Identification Number (VIN) to load the latest, most stable GM-certified software, ensuring seamless integration and optimal performance right out of the box. This process corrects common factory software issues and ensures all systems communicate flawlessly, just as the manufacturer intended.
From the Diagnostic Bay
We recently had a 2001 Savana 2500 work van come into the shop with a complaint of harsh, unpredictable shifting and a persistent P0700 transmission control system code. The transmission itself had been inspected and was mechanically sound. After hours of chasing wires and testing sensors, we traced the fault to an internal failure in the PCM that was sending erratic signals to the transmission solenoids. Swapping in a VIN-programmed module like this one resolved all the shifting issues instantly. The driver was thrilled, stating the van drove better than it had in years.
Symptoms of a Failing 1999-2002 Express 3500 Van PCM
A faulty PCM can manifest in various ways, often mimicking other component failures. If you’re experiencing any of the following, your PCM could be the culprit. This module is designed to correct these common issues and get you back on the road with confidence.
- ✔ Check Engine Light: A persistent Check Engine Light (CEL) that won’t clear, often with communication-related trouble codes (U-codes) or performance codes.
- ✔ Poor Fuel Economy: An unexplained and sudden drop in your vehicle’s MPG due to incorrect fuel and air mixture calculations.
- ✔ Erratic Shifting: Harsh, delayed, or slipping gear changes as the PCM struggles to properly control the transmission.
- ✔ Engine Performance Problems: Rough idling, stalling, hesitation during acceleration, or a general lack of power.
- ✔ No-Start Condition: The engine cranks but refuses to start because the PCM is not correctly firing the fuel injectors or ignition coils.
- ✔ Failed Emissions Test: Inability to pass a smog or emissions inspection due to the PCM’s failure to manage the vehicle’s emissions systems correctly.
The Plug-and-Play Solution
Stop chasing ghosts in your vehicle’s electrical system. This module is a direct-fit replacement for OEM part numbers 16263494, 16265035, 8162634940, and 21811787. The installation process is straightforward for a DIY mechanic or any professional technician. While the module is fully programmed, some vehicles may require a simple security relearn procedure (often called a CASE relearn) to sync with your vehicle’s anti-theft system and crankshaft position sensor. This can typically be done with a capable bi-directional scan tool or by following a specific key-on/key-off procedure.
By providing us with your VIN upon purchase, you ensure that you receive a component perfectly matched to your vehicle’s specific build, including engine size, transmission type, and emissions equipment. This eliminates guesswork and guarantees a successful repair.
Frequently Asked Questions
How do I provide my vehicle’s VIN?
After you complete your purchase, you will receive instructions on how to send us your 17-digit VIN. We cannot program and ship your module without it.
Is this a difficult part to install?
The physical installation is typically simple, involving disconnecting the battery and swapping the module. However, some vehicles may require a security or crankshaft position (CASE) relearn procedure with a scan tool for full functionality.
Will this fix my transmission shifting problems?
If your transmission issues are caused by faulty signals from the PCM, then yes, this module is designed to correct those problems and restore proper shift patterns.
Does this module come with a warranty?
Yes, all of our modules come with a standard warranty against defects. Please see our warranty policy page for complete details.
Is any other programming required after installation?
No, the module arrives fully programmed with the latest GM software for your VIN. The only potential additional step is a security/CASE relearn, which does not involve flashing the module.
My original part number is slightly different. Will this still work?
This module replaces several part numbers, including 16263494 and 16265035. As long as your vehicle is on the compatibility list, our VIN-based programming ensures it will work correctly.