Is Your GM Truck or Van Running Rough?
If you’re dealing with a persistent check engine light, erratic engine behavior, poor fuel economy, or harsh transmission shifting in your 1999-2000 GMC 3500 or other compatible GM vehicle, a failing Powertrain Control Module (PCM) is a likely culprit. As the central computer for your vehicle, the PCM is responsible for managing everything from fuel injection and ignition timing to transmission shift points and emissions controls. When it starts to fail, it can cause a cascade of frustrating and potentially damaging issues.
From the Diagnostic Bay
I once had a 2000 Chevy Express van come in that had its owner chasing his tail for weeks. The van would randomly stall at idle and had a terrible hesitation under acceleration. The owner had already replaced the throttle position sensor, the MAF sensor, and even the fuel pump based on various forum suggestions. After hooking up our professional scan tool, we noticed that the data stream from the PCM was erratic and dropping out intermittently. A quick check of the power and ground circuits to the module confirmed they were solid. The root cause wasn’t a faulty sensor, but a failing processor inside the PCM itself. We installed a VIN-programmed module just like this one, performed the security relearn, and the van ran like it just rolled off the assembly line. It saved the customer from throwing more money at parts he didn’t need.
Symptoms of a Failing Powertrain Control Module
- ✔ Check Engine Light is on with various trouble codes (DTCs)
- ✔ Engine stalling, stumbling, or hesitating
- ✔ Rough or inconsistent idling
- ✔ Noticeable decrease in fuel mileage
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Failure to pass state emissions inspections
- ✔ Vehicle enters ‘limp mode’ with reduced power
- ✔ Intermittent or complete no-start condition
The Direct-Fit Solution: A Programmed 1999-2000 GMC 3500 PCM
Don’t let a faulty computer keep your reliable truck off the road. This Powertrain Control Module is the definitive solution to restore your vehicle’s performance and reliability. We take the guesswork and hassle out of the repair by pre-programming the unit specifically for your vehicle using your VIN. This ensures that the module has the correct calibration for your engine, transmission, and factory options, along with the latest software updates from General Motors. This critical step means you can avoid a costly and time-consuming trip to the dealership for programming.
This module is a direct replacement for multiple part numbers, including 16263494, 16265035, and 8162634940, and fits a wide array of GM trucks and vans from the era, such as the Chevrolet Silverado, Express, Tahoe, S10, and GMC Sierra, Savana, Yukon, and more. Simply provide your vehicle’s VIN at checkout, and we’ll handle the rest. The module will arrive at your door, ready for a straightforward installation.
Frequently Asked Questions
Do I need to have this module programmed by a dealer?
No. We program the module to your vehicle’s specific VIN before shipping it to you. It arrives ready to install, loaded with the latest GM software updates for your vehicle.
What happens if I don’t provide my VIN?
Providing your VIN is mandatory for this part. We cannot ship the module without programming it, as it will not function correctly in your vehicle. The order will be delayed until the VIN is provided.
Where can I find my vehicle’s VIN?
Your 17-digit Vehicle Identification Number (VIN) can be found on your vehicle’s registration, insurance card, or on a metal plate on the driver’s side dashboard visible through the windshield.
Is installation difficult?
For most of the listed vehicles, the PCM is located in the engine bay and is relatively easy to access. The process typically involves disconnecting the battery, unplugging the electrical connectors, and unbolting the module. While it’s a DIY-friendly job for many, we always recommend consulting a service manual for your specific vehicle.
Will I need to perform any other procedures after installation?
In many cases, you may need to perform a security relearn procedure (often called a Passlock or CASE relearn) to sync the new PCM with your vehicle’s anti-theft system. This procedure can typically be done without special tools and instructions are widely available online for your specific model.