The Brain of Your Engine: Restoring Performance and Reliability
Is your Chevrolet Express, GMC Savana, or other GM truck suffering from erratic behavior? Issues like poor fuel economy, shifting problems, a persistent check engine light, or even a no-start condition can often be traced back to a single, critical component: the Powertrain Control Module (PCM). As the central computer for your vehicle’s engine and transmission, the PCM is responsible for managing everything from fuel injection and spark timing to transmission shift points and emissions controls. When it begins to fail, the symptoms can be widespread and frustrating, leaving your reliable workhorse feeling unpredictable.
This replacement Powertrain Control Module is the definitive solution to get your vehicle back to factory-spec operation. It’s not just a part; it’s a comprehensive service. We take the guesswork out of the repair by programming the module specifically for your vehicle using your VIN. This ensures that all factory parameters, anti-theft systems, and vehicle-specific options are correctly configured. By flashing the unit with the latest official GM software updates, we also ensure your vehicle benefits from any performance and reliability improvements released since it left the factory.
From the Diagnostic Bay
We had a 2001 Savana 2500 in the shop that was a real head-scratcher. The owner complained of random stalling at stoplights and a harsh 1-2 shift that came and went. There were no consistent trouble codes, just a generic P0300 random misfire code that would pop up occasionally. We checked plugs, wires, the fuel pump, and even the crank sensor—all were fine. After hours of diagnostics, we hooked up a scope to the PCM outputs and noticed the injector pulse for cylinder 3 would occasionally drop out for a split second. It was an internal PCM fault that was just starting to fail. Swapping in a VIN-programmed module like this one solved the issue instantly. The van ran smoother than it had in years, and the owner was thrilled to have his reliable work van back.
Is Your GM Truck or Van Showing Signs of PCM Failure?
A failing PCM can manifest in numerous ways, often mimicking other component failures. If you’re experiencing any of the following, a faulty module could be the culprit:
- ✔ Check Engine Light: The most common symptom, often with codes related to sensors, emissions, or internal module errors (e.g., P0601-P0606).
- ✔ Engine Performance Issues: Stalling, rough idling, misfiring, hesitation during acceleration, or a noticeable loss of power.
- ✔ Poor Fuel Economy: If the PCM can’t properly regulate the air-fuel mixture, your MPG will suffer significantly.
- ✔ Transmission Problems: Harsh or delayed shifting, or the transmission getting stuck in one gear (limp mode).
- ✔ No-Start Condition: The engine cranks but won’t start because the PCM isn’t firing the ignition coils or fuel injectors.
- ✔ Failed Emissions Test: The PCM directly controls the vehicle’s emissions systems, and a fault will almost certainly cause a test failure.
The Smart Solution: A VIN-Programmed Express 3500 PCM
Don’t risk installing a generic, unprogrammed module from a salvage yard that could cause more problems than it solves. Our process is designed for a seamless repair. When you purchase this Express 3500 PCM, you provide us with your vehicle’s VIN. Our technicians then use that information to load the precise, correct software for your truck’s engine, transmission, and options. This means the module arrives at your door ready for installation, often requiring only a simple security relearn procedure that you can perform yourself. This eliminates the need for an expensive trip to the dealership for programming, saving you both time and money.
This module is a direct replacement for multiple GM part numbers, including 16263494 and 16265035, ensuring broad compatibility across a wide range of popular GM trucks and vans from 1998 through 2002. Please verify your part number and check the detailed fitment list to confirm compatibility.
Frequently Asked Questions
Do I need to send you my old PCM?
No, there is no core charge or need to send in your original module. This is a direct replacement part that we program and ship to you.
What information do you need from me?
After you complete your purchase, we require your vehicle’s 17-digit Vehicle Identification Number (VIN). This is critical for us to program the module with the correct software for your specific vehicle configuration.
Is this module difficult to install?
The physical installation is typically straightforward, involving disconnecting the battery, unplugging the electrical connectors, and unbolting the old module. After installing the new one, you may need to perform a security relearn procedure (often called a CASE relearn or Passlock relearn), which can usually be done without special tools. Instructions can be found online or in a service manual.
Will this fix my check engine light?
If the check engine light and associated symptoms are caused by a faulty PCM, this replacement part will resolve the issue. We recommend having your vehicle properly diagnosed to confirm the PCM is the root cause before ordering.
What does “flashed with the newest updates” mean?
Manufacturers like GM often release software updates for their vehicles to improve drivability, fuel economy, or fix minor bugs. When we program your module, we use the latest software version available from GM for your specific VIN, ensuring your vehicle’s computer is as up-to-date as possible.