Restore Peak Performance to Your GM Truck or Van
Is your 1999-2000 Chevrolet 3500, or another compatible GM vehicle, suffering from frustrating and unpredictable issues? A faulty Powertrain Control Module (PCM), often called the Engine Control Module (ECM), is frequently the culprit behind poor engine performance, erratic transmission shifting, and a persistent check engine light. This module is the central computer of your vehicle, managing everything from fuel injection and ignition timing to transmission shift points and emissions controls. When it fails, the entire vehicle’s performance and reliability are compromised.
This is not just a replacement part; it’s a complete, ready-to-install solution. We take the guesswork and complexity out of the repair by programming this module specifically for your vehicle using your VIN. It will arrive loaded with the latest factory software updates from GM, ensuring optimal performance, fuel efficiency, and drivability right out of the box. Simply provide your VIN after purchase, and our experts will handle the critical programming before shipping.
From the Diagnostic Bay
We once had a 2000 GMC Sierra in the shop with classic PCM failure symptoms—stalling, no communication with our scan tool, and multiple error codes. The owner had already replaced two other sensors trying to chase the problem. Before condemning the module, we did a voltage drop test on the main ground wire from the battery to the engine block. We found high resistance due to hidden corrosion under the bolt. After cleaning the connection point and re-securing the ground, all the symptoms vanished. Always verify your main power and ground connections to the PCM are clean and tight before replacing it. A solid electrical foundation is critical for these modules to function correctly.
Is Your PCM Failing? Common Symptoms
- ✔ Persistent Check Engine Light (CEL) that won’t clear.
- ✔ Engine stalling, misfiring, or running rough.
- ✔ A noticeable decrease in fuel economy.
- ✔ Harsh, delayed, or incorrect automatic transmission shifts.
- ✔ Complete no-start or intermittent starting condition.
- ✔ Failure to communicate with diagnostic scan tools.
- ✔ Various seemingly unrelated warning lights on the dashboard.
Your Direct-Fit 1999-2000 Chevrolet 3500 PCM Solution
Choosing this pre-programmed PCM is the most efficient way to get your truck back on the road. Bypassing a trip to the dealership for expensive programming saves you both time and money. Our process ensures that the module you receive is a perfect match for your vehicle’s original configuration and benefits from any performance and reliability improvements included in the latest GM software calibrations. This module is a direct replacement for multiple part numbers, including 16263494, 16265035, and 8162634940, and fits a wide range of GM trucks and vans from 1998 to 2002. Please verify your vehicle in the detailed fitment list to ensure compatibility.
Frequently Asked Questions
Why do you need my vehicle’s VIN?
Your Vehicle Identification Number (VIN) is essential for us to program the PCM with the exact software and calibrations your vehicle requires. This ensures perfect compatibility with your engine, transmission, and other factory options, making the installation process seamless.
Is this module difficult to install?
Physically replacing the module is straightforward for most DIY mechanics, typically involving disconnecting the battery, unplugging a few electrical connectors, and removing mounting bolts. However, depending on your vehicle’s security system, a security relearn procedure (often called a CASE relearn) may be required after installation. This can often be done without special tools and instructions can be readily found online.
Will this fix my check engine light?
If the check engine light and associated diagnostic trouble codes (DTCs) are caused by a faulty PCM, then this replacement will resolve the issue. We always recommend having a proper diagnosis performed to confirm the PCM is the root cause before ordering.
What is the process after I place my order?
After you complete your purchase, we will contact you to request your vehicle’s VIN. Once we receive it, our technicians will program the module and typically ship it out within 1-2 business days.
Does this PCM come with the latest software?
Yes. We flash every module with the most current GM-approved calibration available for your specific VIN. This can help resolve common drivability issues that were addressed in later software releases.