Restore Peak Performance to Your GM Truck or Van
Is your trusty GMC, Chevrolet, or Isuzu truck suffering from perplexing issues like a persistent check engine light, poor fuel economy, erratic shifting, or even a no-start condition? These are classic signs that the brain of your vehicle’s powertrain, the Powertrain Control Module (PCM), may be failing. This vital component manages everything from fuel injection and ignition timing to transmission shift points. When it malfunctions, it can cause a cascade of problems that leave you stranded and frustrated. This replacement Powertrain Control Module, compatible with part number 16263494, is the definitive solution to get your vehicle running smoothly and reliably again.
From the Diagnostic Bay
We had a 1999 Chevy Tahoe come in that was driving the owner crazy. It would run fine for a week, then suddenly start stalling at red lights and shifting hard between first and second gear. He’d replaced sensors and checked wiring, but the intermittent nature of the problem made it a nightmare to diagnose. After hooking up our professional scan tool and monitoring live data, we noticed the PCM was intermittently dropping communication. We swapped in a pre-programmed module just like this one, keyed to the truck’s VIN. The difference was immediate. The stalling vanished, the shifts smoothed out, and the owner was thrilled to have his reliable Tahoe back. It’s a perfect example of how a faulty PCM can mimic a dozen other problems.
Common Symptoms of a Failing PCM
- ✔ Check Engine Light is illuminated with various trouble codes.
- ✔ Your vehicle fails to start or has difficulty starting.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ The engine misfires, stalls, or runs rough.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Failure to pass emissions testing.
- ✔ Communication errors with diagnostic scan tools.
Your Direct-Fit Solution: The 1999 GMC 1500 PCM
Don’t settle for a generic, one-size-fits-all module that requires an expensive trip to the dealership for programming. We take the guesswork and hassle out of the repair. When you purchase this module, you provide us with your vehicle’s 17-digit Vehicle Identification Number (VIN). Our technicians then flash the unit with the latest, most up-to-date OEM software directly from GM, ensuring it is a perfect match for your vehicle’s specific configuration. This plug-and-play solution means no additional programming is required on your end. It arrives at your door ready for installation, saving you time, money, and the headache of coordinating with a repair shop.
This module is a direct replacement for a wide range of popular GM trucks and vans from the late 90s and early 2000s, including the Chevrolet Silverado, GMC Sierra, Tahoe, Yukon, Suburban, Express, Savana, and more. Please verify your original part number or consult the detailed fitment list to confirm compatibility. This unit replaces part numbers 16263494, 16265035, 8162634940, 218-11787, and 21811787.
Installation is Straightforward
For most compatible vehicles like the 1999 GMC 1500, the PCM is located in the engine compartment, typically on the driver’s side near the battery or firewall. The process generally involves disconnecting the vehicle’s battery, carefully unplugging the electrical connectors from the old module, unbolting it from its bracket, and then installing the new module in the reverse order. Once the new, pre-programmed module is installed and the battery is reconnected, your vehicle is ready to go. In some cases, a security relearn procedure may be necessary, which can often be done without special tools.
Frequently Asked Questions
Do I need to get this PCM programmed?
No. This module comes fully programmed to your vehicle’s specific VIN before it is shipped. It is ready to install right out of the box, saving you a trip to the dealership.
What information do you need from me?
After you complete your purchase, we will need your vehicle’s 17-digit VIN to load the correct GM software onto the module.
Where is the PCM located on my 1999 GMC 1500 Pickup?
On most 1999 GMC/Chevy 1500 series trucks, the PCM is located in the engine compartment on the driver’s side, often near the battery or attached to the inner fender.
Is this the same as an ECM or Engine Control Module?
The terms are often used interchangeably. A PCM (Powertrain Control Module) typically controls both the engine and the transmission, while an ECM (Engine Control Module) may only control the engine. For this generation of GM trucks, this module functions as the PCM.
Will this fix my check engine light?
If your check engine light and other symptoms are being caused by a faulty PCM, this part is the correct solution. However, if the light is on due to other failing sensors or components, those issues will still need to be addressed separately.