Is your 1999 Chevrolet 1500 or other compatible GM truck suffering from perplexing issues like a persistent check engine light, poor fuel mileage, rough idling, or erratic shifting? These are classic symptoms of a failing Powertrain Control Module (PCM). As the central computer of your vehicle, the PCM is responsible for managing critical engine and transmission functions. When it starts to fail, it can cause a cascade of problems that affect performance, reliability, and drivability.
Don’t let a faulty computer keep your reliable GM truck off the road. This replacement PCM is the definitive solution, designed to restore your vehicle’s factory performance and efficiency. It serves as a direct replacement for multiple part numbers, including the common 16263494, ensuring broad compatibility across a wide range of Chevrolet, GMC, Cadillac, and Isuzu models from the late 1990s and early 2000s.
Expert Pro Tip
Before installing your new PCM, it’s crucial to disconnect the vehicle’s battery for at least 15 minutes. After installation, double-check that all electrical connectors are clean and securely seated. A poor connection is a common source of communication errors that can mimic PCM failure. Also, inspect the main engine wiring harness for any signs of chafing or damage, especially where it routes near hot or sharp components.
Your Solution for a Reliable 1999 Chevrolet 1500 PCM
Getting your truck back to peak condition shouldn’t require a complicated and expensive trip to the dealership. Our process is designed for the everyday owner and the professional mechanic alike. We take the guesswork out of the repair by pre-programming this module specifically for your vehicle. All we need is your 17-digit Vehicle Identification Number (VIN) during checkout. Our technicians will flash the unit with the latest, most up-to-date GM factory software calibrations for your exact model. This ensures that the PCM correctly communicates with your engine, transmission, anti-lock brakes, and security system (VATS/Passlock) right out of the box.
Common Symptoms of a Failing PCM:
- ✔ Persistent Check Engine Light (CEL) with various trouble codes
- ✔ Engine stalling, stumbling, or misfiring
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Failure to pass state emissions tests
- ✔ Noticeable decrease in fuel economy
- ✔ Intermittent no-start or hard-starting conditions
- ✔ Communication errors with diagnostic scan tools
This module is a direct fit for dozens of vehicles. While it is a perfect match for a 1999 Chevrolet 1500 PCM, it also fits models like the Chevrolet Silverado, Tahoe, Suburban, Express Van, S10, Blazer, and their GMC counterparts such as the Sierra, Yukon, Savana, and Sonoma, among others. Always confirm your original part number matches 16263494 or one of the other compatible numbers listed to guarantee fitment.
Frequently Asked Questions
Do I need to program this module after I receive it?
No. This PCM arrives at your door fully programmed to your vehicle’s specific VIN. It is a true plug-and-play solution, requiring no further dealer programming or expensive tools. A security relearn procedure may be necessary on some models, which is a simple process you can do in your driveway.
What information do you need from me?
We only need your vehicle’s 17-digit VIN. You can typically find this on the driver’s side of the dashboard (visible through the windshield), on the driver’s door jamb sticker, or on your vehicle’s registration and insurance documents.
Will this fix my check engine light?
If the check engine light is on due to an internal failure of your original PCM, then yes, this part will resolve the issue. We highly recommend having the codes read with a diagnostic scanner before ordering to confirm the problem is related to the computer and not another sensor or component.
What is the difference between a PCM and an ECM?
An ECM (Engine Control Module) typically controls only engine-related functions. A PCM (Powertrain Control Module) is a more integrated unit that controls both the engine and the transmission. For these GM trucks and vans, the terms are often used interchangeably for this single control unit.
Where is the PCM located on my vehicle?
On most compatible trucks and SUVs like the Chevrolet 1500, Tahoe, and Suburban, the PCM is located in the engine compartment, typically on the driver’s side fender well or near the battery. On vans like the Express and Savana, it is often found in the rear of the engine compartment on the driver’s side.