Is Your GM Truck or Van Running Rough?
If your late 90s or early 2000s Chevrolet, GMC, or Isuzu is suffering from issues like stalling, erratic shifting, a persistent check engine light, or a no-start condition, a failing Powertrain Control Module (PCM) is often the culprit. The PCM is the central computer of your vehicle, managing everything from fuel injection and spark timing to transmission shift points and emissions controls. When it begins to fail, it can cause a cascade of frustrating and difficult-to-diagnose problems, leaving your reliable workhorse dead in the driveway.
From the Diagnostic Bay
We had a 2000 Chevy Express van come in on the hook last month. The owner, a contractor, said it would crank all day but wouldn’t fire up. He’d already replaced the fuel pump and the crank sensor, but nothing worked. After plugging in our scanner, we found we couldn’t communicate with the engine computer at all. We checked the powers and grounds to the PCM connector and they were all good. That’s a classic sign of internal PCM failure. We installed one of our pre-programmed modules, performed the quick security relearn, and the van fired up on the first try. It’s a common failure on these hardworking vehicles, but a straightforward fix with the right part.
The Direct Solution for Your 1999-2000 Chevrolet 2500 PCM
Don’t let a faulty computer sideline your vehicle. This Powertrain Control Module is a direct-fit replacement, solving the root cause of these complex electronic issues. We take the guesswork and hassle out of the repair by programming the module specifically for your vehicle using your VIN. This ensures that it has the latest GM factory software updates and will integrate seamlessly with your truck’s existing systems. Once installed, it will restore proper engine and transmission function, improve fuel economy, and get you back on the road with confidence.
Common Symptoms of a Failing GM PCM
- ✔ Persistent Check Engine Light (CEL) that won’t clear.
- ✔ Engine cranks but refuses to start.
- ✔ Unexplained stalling or rough idling.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ A noticeable decrease in fuel efficiency.
- ✔ Misfire codes or other sensor codes that return after replacing the parts.
- ✔ No communication with the module when using a diagnostic scan tool.
This module is a reliable and effective solution for a wide range of GM vehicles. Simply provide your VIN after purchase, and we’ll handle the programming. Installation is straightforward, and in most cases, only a simple security relearn procedure is required, which you can do yourself in your driveway. This part is a direct replacement for multiple service numbers, including 16263494, 16265035, and 8162634940.
By ordering our pre-programmed 1999-2000 Chevrolet 2500 PCM, you are not just buying a part; you are getting a complete solution that saves you a costly trip to the dealership for programming and diagnostics.
Frequently Asked Questions
What is the difference between a PCM, ECM, and ECU?
These terms are often used interchangeably. ECM (Engine Control Module) typically just controls engine functions. A PCM (Powertrain Control Module) is more integrated and controls both the engine and the transmission. ECU (Electronic Control Unit) is a more generic term for any computer in the vehicle. For this generation of GM trucks, PCM is the most accurate term.
How do I provide my VIN for programming?
After you complete your purchase, you will receive instructions on how to send us your vehicle’s 17-digit VIN. We cannot ship your module until we receive this information, as the programming is essential for the part to function in your truck or van.
Is this part truly plug-and-play?
Yes, because we program it to your VIN, it is designed to be a plug-and-play installation. However, due to GM’s Passlock security system, you will likely need to perform a simple security relearn procedure after installation. This usually involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times. We provide instructions for this simple process.
How can I be sure my old PCM is the problem?
While the symptoms listed are strong indicators, it’s always best to have a proper diagnosis. Key signs of a bad PCM include a lack of communication with a scan tool (when powers and grounds are confirmed good at the module) and multiple unrelated trouble codes that appear simultaneously.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls the transmission’s electronic solenoids to manage shift points. If your transmission issues are electronic in nature and caused by a faulty PCM, this replacement part will resolve them. It will not fix internal mechanical failures within the transmission itself.