Restore Peak Performance to Your GM Truck or Van
Is your 1999 Chevrolet 1500, or another compatible GM vehicle, suffering from perplexing issues like a persistent check engine light, rough idling, stalling, or erratic transmission shifting? These are classic signs of a failing Powertrain Control Module (PCM), the central computer that governs your vehicle’s engine and transmission functions. When the PCM begins to fail, it can cause a cascade of problems that are often misdiagnosed, leading to wasted time and money on unnecessary parts. This replacement PCM, service number 16263494, is the definitive solution to restore your vehicle’s reliability and drivability.
From the Diagnostic Bay
We recently had a 1999 GMC Sierra in the shop with a persistent P0300 random misfire code. The owner had already replaced the spark plugs, wires, distributor cap, rotor, and even the costly fuel spider injector assembly. The misfire persisted. After verifying fuel pressure and ignition system integrity, we connected a scope to the injector control signals coming from the PCM. We found that the driver for cylinder 3 was dropping out intermittently under load. A new, correctly programmed PCM fixed the issue instantly. It’s a powerful reminder that when all the mechanical components check out, the computer itself is often the root cause.
Why Choose Our Programmed 1999 Chevrolet 1500 PCM?
This is not just a generic, off-the-shelf part. We provide a comprehensive solution tailored specifically to your vehicle. Before this module ships, our technicians will flash it with the latest official GM software updates using the unique Vehicle Identification Number (VIN) you provide. This critical step ensures that the PCM is a perfect match for your vehicle’s specific configuration, including engine size, transmission type, and emissions equipment. This process corrects factory bugs, improves performance, and guarantees a seamless plug-and-play installation without requiring a trip to the dealership for expensive programming.
Is Your Truck Showing Signs of PCM Failure?
- ✔ Persistent Check Engine Light (CEL) with various trouble codes.
- ✔ Engine stalling, stumbling, or hesitating during acceleration.
- ✔ Rough or inconsistent idle.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh, delayed, or incorrect transmission shifting.
- ✔ Failure to start or intermittent starting issues.
- ✔ Inability for a scan tool to communicate with the module.
Guaranteed Compatibility and Simple Installation
This module is a direct replacement for service number 16263494 and is also compatible with part numbers 16265035, 8162634940, 218-11787, and 21811787. It fits a wide array of GM trucks, SUVs, and vans from the late 1990s to the early 2000s, including the Chevrolet Silverado, Express, Tahoe, S10, Blazer, and their GMC counterparts like the Sierra, Savana, Yukon, and Sonoma. Please verify the part number on your original module to ensure a perfect match.
Installation is straightforward for any DIY mechanic or professional technician. Simply disconnect the battery, locate your existing PCM (typically in the engine bay), unplug the wiring harnesses, unbolt the old unit, and install the new one in its place. Once the battery is reconnected, you may need to perform a simple security relearn procedure (often called a CASE learn), which can typically be done without special tools. This restores communication between the PCM and your vehicle’s anti-theft system.
Frequently Asked Questions
Do I need to have this PCM programmed by a dealer?
No. We handle all the programming for you before the part is shipped. Simply provide us with your vehicle’s 17-digit VIN during checkout, and it will arrive ready to install with the latest GM software updates for your specific vehicle.
What information do you need from me?
All we need is your vehicle’s complete 17-digit VIN. This allows us to flash the module with the exact software and calibrations your truck or van requires for proper operation.
Is this a simple plug-and-play installation?
Yes, for the most part. The module is physically a direct swap. After installation, some vehicles may require a security relearn procedure to sync the new PCM with the vehicle’s anti-theft system. This is a standard procedure and instructions can be readily found online or in a service manual.
How can I be sure my old PCM is the problem?
While the symptoms listed above are strong indicators of a faulty PCM, it’s always best to have a proper diagnosis performed by a qualified technician. This involves checking for trouble codes, testing sensor inputs and outputs, and verifying power and ground connections to the module to rule out other potential issues.
Does this part fit vehicles other than the 1999 Chevy 1500?
Absolutely. This PCM is compatible with a wide range of GM vehicles from approximately 1998 to 2002 that use the same service number. This includes various Chevrolet, GMC, Cadillac, Oldsmobile, and Isuzu models with the 4.3L, 5.0L, and 5.7L gasoline engines. Please refer to the detailed fitment list on this page.