Restore Peak Performance to Your GM Truck or Van
Is your truck or van suffering from baffling electrical issues, a persistent check engine light, or poor performance? The Powertrain Control Module (PCM), often called the ECM or engine computer, is the central command unit for your vehicle’s engine and transmission. When it begins to fail, it can cause a cascade of problems that are often difficult to diagnose. This replacement PCM is the definitive solution to restore your vehicle’s reliability and drivability. It arrives fully programmed to your vehicle’s specific Vehicle Identification Number (VIN), loaded with the latest GM factory software updates to ensure optimal performance and efficiency right out of the box.
From the Diagnostic Bay
We had a 2000 Chevy Express van come in that the owner had been chasing a ghost in for months. It would randomly stall at idle and had a harsh 1-2 shift. He had already replaced the throttle position sensor, the idle air control valve, and even the fuel pump based on advice from forums. After hooking up our scanner, we noticed the data stream from the PCM would freeze just before a stall. We checked all power and ground circuits to the computer and found them to be perfect. The issue was internal to the original module. After installing one of our VIN-programmed PCMs, the van ran like new. It’s a classic case where throwing parts at a problem costs more than correctly diagnosing the central computer failure from the start.
Is Your 1999-2000 GMC 2500 PCM Failing?
A faulty PCM can manifest in numerous ways, often mimicking other sensor or component failures. Before you spend hundreds on parts you don’t need, check if your vehicle is exhibiting any of these common symptoms of a bad engine computer. This module is the correct solution for these issues.
- ✔ Persistent Check Engine Light (CEL) that won’t clear.
- ✔ Error codes related to PCM communication or internal processor failure.
- ✔ Harsh, erratic, or delayed transmission shifting.
- ✔ Engine misfires, stumbling, or poor idling.
- ✔ Complete no-start condition where the engine cranks but will not fire up.
- ✔ Unexplained drop in fuel economy and loss of power.
- ✔ Intermittent problems that seem to have no pattern.
The Critical Advantage of VIN Programming
Simply swapping a used PCM from another vehicle will not work. Modern GM vehicles utilize a sophisticated anti-theft system (Passlock/VATS) and require precise software tailored to the engine, transmission, and options your vehicle was built with. Our process eliminates the hassle and expense of a dealership visit. We take your VIN, access the official GM database, and flash the module with the exact software your vehicle needs. This ensures all components communicate correctly and that you benefit from any performance and reliability improvements GM has released since your truck was new. This is a true plug-and-play repair solution for your 1999-2000 GMC 2500 PCM.
This module is a direct replacement for a wide range of GM trucks and vans from the era, including the Chevrolet Silverado, Express, Tahoe, Suburban, S10, Blazer, and their GMC Sierra, Savana, Yukon, and Sonoma counterparts. Please verify your part number or consult the detailed fitment list to confirm compatibility. This unit replaces part numbers 16263494, 16265035, 8162634940, 218-11787, and 21811787.
Frequently Asked Questions
What information do you need from me?
After you place your order, we simply need your 17-digit Vehicle Identification Number (VIN). You can typically find this on your vehicle’s dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.
Will this module be truly ‘plug and play’?
Yes, for most vehicles. We program it so the engine and transmission will operate correctly upon installation. However, on some GM models, you may need to perform a simple security relearn procedure (often called a Passlock or VATS relearn) to sync the new PCM with your vehicle’s anti-theft system. This procedure typically involves turning the key on and off in a specific sequence and does not require special tools.
Do I need to send my old PCM back?
No. There is no core charge or need to return your old, faulty module. You can recycle it locally or keep it.
How do I know this will fix my problem?
While this PCM is the solution for the symptoms listed, we always recommend proper vehicle diagnostics. Ensure that the power and ground connections to your existing PCM are clean, tight, and showing correct voltage before condemning the module. A faulty sensor or wiring issue can sometimes mimic PCM failure.
Does this come with the latest software?
Absolutely. We flash every module with the most recent and stable software version available from General Motors for your specific VIN. This can resolve many common drivability issues, improve transmission shifting, and enhance overall performance.