Is Your GM Truck or Van Running Rough?
If your late 90s or early 2000s GMC, Chevrolet, or Isuzu is suffering from perplexing issues like a persistent check engine light, erratic shifting, poor fuel economy, or a no-start condition, the culprit is often the Powertrain Control Module (PCM). As the central computer of your vehicle, the PCM orchestrates everything from fuel injection and ignition timing to transmission shift points and emissions controls. When it begins to fail, it can cause a cascade of problems that are frustrating and difficult to diagnose.
The Direct Solution for a Failing Engine Computer
Don’t let a faulty computer keep your reliable truck or van off the road. This Powertrain Control Module, compatible with part numbers including 16263494 and 8162634940, is the definitive solution. We take the guesswork and hassle out of the replacement process. Unlike sourcing a part from a salvage yard that may have its own issues or require expensive dealership programming, this module arrives at your door ready for installation. We use your vehicle’s Vehicle Identification Number (VIN) to flash the unit with the latest, most stable software updates directly from GM. This ensures perfect compatibility and optimal performance from the moment you plug it in.
From the Diagnostic Bay
We had a 2000 Chevy Express van come in that the owner used for his plumbing business. The van would randomly stall at stoplights and occasionally wouldn’t start in the morning. He’d already replaced the fuel pump and ignition coil to no avail. After hooking up our professional scan tool, we noticed intermittent communication loss with the PCM. Instead of a hard fault code, the computer was just… disappearing. We knew these symptoms pointed to an internal PCM failure. We installed a VIN-programmed module just like this one, performed the quick security relearn, and the van fired up perfectly. The owner called a week later to say his van hadn’t run that smoothly in years. That’s the difference a reliable, correctly programmed module makes.
Restore Peak Performance with a Programmed GMC 2500 PCM
Your vehicle was built to work hard, and its engine computer is the key to its longevity and efficiency. Over time, heat cycles, vibrations, and electrical stress can degrade the sensitive internal components of the original PCM. Our replacement modules are meticulously inspected and programmed to restore the precise control your engine and transmission require. By providing us with your VIN during checkout, you guarantee that the module you receive is loaded with the correct calibration file for your specific engine, transmission, and emissions equipment.
Common Symptoms of a Failing PCM
- âś” Persistent Check Engine Light (CEL) with various codes
- âś” Rough, unstable, or surging engine idle
- âś” Noticeable decrease in fuel economy
- âś” Harsh, delayed, or incorrect transmission shifting
- âś” Engine stalling, stumbling, or complete failure to start
- âś” Inability to pass state emissions inspections
- âś” No communication with OBD-II diagnostic scan tools
This module is a direct-fit replacement for a wide array of popular GM vehicles, including the Chevrolet Silverado, GMC Sierra, Tahoe, Yukon, Express, Savana, and more. Please review the detailed fitment list and confirm your original part number to ensure compatibility.
Frequently Asked Questions
Why do you need my vehicle’s VIN?
Your VIN (Vehicle Identification Number) allows us to access the exact factory calibration file for your truck or van. We program the module with this specific software, including all GM updates, to ensure it communicates perfectly with your vehicle’s engine, transmission, and other systems. This makes the installation plug-and-play.
Will I need to do any programming after I install it?
No dealership programming is required. The module arrives fully flashed for your vehicle. However, on most GM vehicles of this era, you will need to perform a simple security relearn procedure (often called the Passlock or VATS relearn) which syncs the new PCM to your vehicle’s anti-theft system. This procedure takes about 30 minutes and can be done in your driveway with just the ignition key.
How do I perform the security relearn procedure?
The most common procedure is: 1) Turn the key to the ‘ON’ position (don’t start the engine). 2) Wait for the ‘Security’ light to turn off (approx. 10-15 minutes). 3) Turn the key ‘OFF’ for 10 seconds. 4) Repeat steps 1-3 two more times for a total of three cycles. After the third cycle, the vehicle should start and run normally.
Where is the PCM located on my vehicle?
The location varies by model. On most pickups like the GMC 2500, Silverado, and Sierra, it’s located in the engine compartment on the driver’s side, often near the battery or firewall. On vans like the Express and Savana, it’s typically in the rear of the engine compartment on the driver’s side.
Is this a guaranteed fix for my vehicle’s problems?
This module will resolve any issues directly caused by a faulty PCM. While the symptoms listed are very common for PCM failure, they can also be caused by other failing sensors or wiring issues. Proper vehicle diagnosis is always recommended to confirm the PCM is the root cause of the problem before ordering.