Is Your GM Truck or Van Running Rough? The PCM Might Be the Culprit.
The Powertrain Control Module, or PCM, is the central computer of your vehicle’s engine and transmission. It manages everything from fuel injection and ignition timing to transmission shift points and emissions controls. When it begins to fail, it can cause a wide range of confusing and frustrating problems that can be difficult to diagnose. If your Chevrolet Express, GMC Savana, Silverado, or other compatible GM vehicle is experiencing erratic behavior, a faulty PCM is a very likely cause.
This replacement Powertrain Control Module, part number 16265035, is the definitive solution to restore your vehicle’s performance, reliability, and efficiency. We take the guesswork out of the repair by programming the module specifically for your vehicle using your VIN. This ensures that it has the correct calibration and the latest software updates directly from GM, addressing potential issues that may have been discovered after your vehicle left the factory. This isn’t just a replacement part; it’s a direct path to resolving complex electronic issues and getting your dependable truck or van back to work.
From the Diagnostic Bay
We had a 2001 Savana 3500 work van come into the shop that was driving the owner crazy. It would randomly stall at idle and had a harsh 1-2 shift that would jerk the whole van. The owner had already replaced the throttle position sensor and the mass airflow sensor based on some generic trouble codes, but the problem persisted. After hooking up our professional scan tool, we noticed the PCM was losing communication intermittently. Instead of chasing more sensors, we identified the PCM as the root cause. We installed a VIN-programmed module just like this one, performed a quick security relearn, and the van ran perfectly. The harsh shifting was gone, the stalling stopped, and the owner was thrilled to have his reliable workhorse back without wasting any more money on unnecessary parts.
Symptoms of a Failing GM Powertrain Control Module
A failing PCM can manifest in numerous ways. If you’re noticing any of the following issues, it’s time to consider a replacement Express 2500 PCM:
- ✔ Persistent Check Engine Light (CEL) that won’t clear or returns with various codes.
- ✔ Rough or unstable idling.
- ✔ Engine stalling or cutting out unexpectedly.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh, erratic, or delayed transmission shifting.
- ✔ The vehicle enters “limp mode” with reduced power.
- ✔ Complete no-start condition where the engine cranks but won’t fire up.
- ✔ Communication errors with diagnostic scan tools.
The Plug-and-Play Solution for Your Vehicle
Why choose our pre-programmed module? We simplify a complex repair. Dealerships can charge a fortune for a new module, programming, and installation. We provide a cost-effective, high-quality component that is ready for installation right out of the box. Simply provide us with your vehicle’s VIN during or after checkout, and our technicians will flash the module with the precise software your vehicle needs. This critical step ensures all systems communicate correctly, from the engine and transmission to the anti-lock brakes and security system.
This module is a direct replacement for multiple part numbers, including 16263494, 16265035, and 8162634940. It is compatible with a vast range of popular GM trucks and vans from the late 1990s and early 2000s, including the Chevrolet Silverado, GMC Sierra, Tahoe, Yukon, Astro, Safari, and many more. Please verify your part number and consult the detailed fitment list to ensure perfect compatibility with your specific model and year.
Replacing your faulty Express 2500 PCM is a straightforward job for a competent DIY mechanic or any professional technician. Once installed, some vehicles may require a simple security relearn procedure (often called Passlock or VATS), which can typically be done without special tools. This ensures the new module communicates with your vehicle’s anti-theft system. Restoring your vehicle’s brain is the most effective way to solve deep-rooted electronic issues and ensure it runs reliably for years to come.
Frequently Asked Questions
What is a PCM and what does it do?
The Powertrain Control Module (PCM) is your vehicle’s main computer. It controls all aspects of the engine’s performance and the automatic transmission’s operation to ensure optimal power, fuel efficiency, and low emissions.
How do I provide my VIN?
You can enter your 17-digit Vehicle Identification Number (VIN) during the checkout process or send it to us via email after you place your order. We cannot ship your part until we have your VIN to program it correctly.
Is any additional programming required after installation?
No, this module comes fully programmed to your VIN with the latest GM software. However, depending on your specific vehicle, you may need to perform a simple security relearn procedure to sync the module with your 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, this part is the correct solution. However, the light can be triggered by many other components. It is always best to have the vehicle properly diagnosed to confirm the PCM is the point of failure before ordering.
Is this a new or used part?
This is a genuine, quality-inspected component that has been meticulously tested to meet or exceed original equipment specifications. It is then programmed with factory-fresh software specific to your vehicle.