Is Your GM Truck or Van Running Rough?
If your 1999-2000 GMC Sierra, Chevrolet Silverado, or another compatible GM vehicle is suffering from perplexing issues like harsh shifting, a persistent check engine light, stalling, or a no-start condition, the root cause is often a failing Powertrain Control Module (PCM). As the central computer for your engine and transmission, a faulty PCM can create a cascade of problems that are frequently misdiagnosed, leading to expensive and unnecessary repairs on sensors and other components.
From the Diagnostic Bay
We had a 2000 Silverado 1500 come into the shop with a classic complaint: erratic shifting and a check engine light for a transmission solenoid. The owner had already replaced the solenoid twice with no luck. After connecting our scanner, we noticed the data stream from the PCM was inconsistent. Instead of chasing electrical ghosts in the transmission harness, we swapped in a correctly programmed PCM. The truck immediately shifted perfectly, and the codes never returned. It’s a textbook example of how a failing computer can mimic a mechanical failure, costing the owner time and money before the real issue is found.
Common Symptoms of a Failing PCM
- ✔ Check Engine Light is on with various, often unrelated, trouble codes.
- ✔ Engine stalling, misfiring, or running poorly.
- ✔ Transmission shifting erratically, harshly, or getting stuck in gear.
- ✔ Decreased fuel economy for no apparent reason.
- ✔ The vehicle fails to start, even with a good battery and starter.
- ✔ Communication errors with diagnostic scan tools.
The Plug-and-Play Solution: A VIN-Programmed 1999-2000 Sierra PCM
Don’t let a faulty computer keep your reliable GM truck off the road. This Powertrain Control Module is the definitive solution to restore your vehicle’s performance and dependability. We take the guesswork out of the repair by programming the module specifically for your vehicle using the VIN you provide. This ensures that all factory settings, transmission shift points, and engine parameters are perfectly matched to your truck’s original specifications. It arrives at your door ready for installation, eliminating the need for an expensive trip to the dealership for programming.
This module is a direct replacement for a wide range of GM trucks and vans from the late 90s and early 2000s, including the Chevrolet Express, GMC Savana, Tahoe, Yukon, S10, and Blazer. Please verify your original part number against our compatible list (16263494, 16265035, 8162634940) and check the detailed fitment list to ensure compatibility.
Frequently Asked Questions
Do I need to program this module?
No. We handle all the programming for you before shipment. Simply provide us with your vehicle’s 17-digit VIN during or after checkout, and the module will arrive ready to be installed.
Will I need to perform a security or CASE relearn procedure?
For many of these GM vehicles, a security relearn (Passlock/VATS) and a Crankshaft Variation (CASE) relearn may be necessary after installation. The security relearn can often be done without special tools, while the CASE relearn typically requires a capable bi-directional scan tool. These procedures ensure the module communicates correctly with your vehicle’s anti-theft system and crankshaft position sensor.
Where is the PCM located on my vehicle?
On most trucks like the Sierra and Silverado, the PCM is located in the engine compartment on the driver’s side, often under or near the battery tray. On vans like the Express and Savana, it’s typically found in the rear of the engine compartment on the driver’s side. Always disconnect the battery before attempting removal or installation.
How do I find my vehicle’s VIN?
Your vehicle’s 17-digit Vehicle Identification Number (VIN) can be found on a metal plate on the driver’s side of the dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.
Is this module compatible with part number 16263494?
Yes. This module is a direct, compatible replacement for several service numbers, including 16263494, 16265035, 8162634940, 218-11787, and 21811787. As long as your vehicle is on the fitment list, this module will function correctly once programmed to your VIN.