Is Your 1999-2000 Sierra 1500 Running Rough or Not Starting at All?
If your trusty GMT800 platform truck is suddenly giving you headaches—like stalling for no reason, shifting erratically, or refusing to start—the problem might be deeper than a simple sensor. As a technician with over two decades of experience, I’ve seen these exact issues hundreds of times. Often, the trail of diagnostic codes (or a complete lack of communication) leads directly to a failed Powertrain Control Module (PCM), the electronic brain of your vehicle.
A Technician’s Take on PCM Failure in GM Trucks
The PCM in your Sierra, Silverado, Tahoe, or Yukon is the master conductor of an electronic orchestra. It processes data from dozens of sensors to precisely manage fuel injection, ignition timing, transmission shift points, and emissions systems. When it starts to fail, the symptoms can be confusing and mimic other component failures. The internal circuit boards and processors are susceptible to failure from heat cycles, vibration, and voltage spikes over 20+ years of service. This can lead to intermittent connections or complete component breakdown inside the module.
Expert Pro Tip: Check This Before You Order
Before you condemn your PCM, do a quick visual inspection. On these GM trucks, I’ve seen countless cases where a corroded or loose main ground wire causes PCM-like symptoms. Check the ground strap from the battery to the chassis and the engine block to the frame. Also, ensure your battery terminals are clean and tight. A simple cleaning with a wire brush has saved more than a few customers from an unnecessary repair. If those are solid and the problems persist, the PCM is your most likely culprit.
Common Symptoms of a Failing PCM (Part #09354896)
If your truck is experiencing any of the following, a faulty PCM is a strong possibility:
- ✔ The Check Engine Light is on, but a scanner can’t communicate with the computer.
- ✔ Your engine cranks but won’t start, despite having fuel and spark.
- ✔ The transmission shifts harshly, gets stuck in one gear (limp mode), or shifts at the wrong times.
- ✔ Unexplained stalling, sputtering, or a significant loss of power.
- ✔ Multiple, unrelated trouble codes are stored in the system.
- ✔ The anti-theft or security light stays on, preventing the engine from starting.
The Solution: A Reliable, VIN-Programmed PCM
Don’t let a faulty computer keep your truck off the road. This Powertrain Control Module is the definitive solution. We take all the guesswork and hassle out of the replacement process. The biggest hurdle with PCM replacement is the need for expensive, dealer-level programming. We handle that for you before we ship the part.
Simply provide us with your vehicle’s 17-digit VIN during checkout. Our technicians will then flash the module with the latest, most stable GM-approved software specific to your exact vehicle configuration. This ensures that when it arrives, it’s ready to be installed and integrated into your truck’s system.
Installation and Security Relearn
On most of these GM vehicles, installation is straightforward. The PCM is typically located under the battery tray on the driver’s side. After swapping the module, you will need to perform a simple security relearn procedure so the vehicle recognizes the new PCM. This doesn’t require any special tools and usually involves a 10-30 minute key-cycle process. We include instructions to make this final step easy.
Guaranteed Compatibility
This module is a direct replacement for part numbers 19109040, 09354896, and 9354896. It is guaranteed to fit and function correctly on the following vehicles:
- ✔ 1999-2000 Sierra 1500 Pickup (8 cylinder)
- ✔ 1999-2000 Silverado 1500 Pickup (8 cylinder)
- ✔ 1999-2000 Sierra 2500 Pickup
- ✔ 1999-2000 Silverado 2500 Pickup
- ✔ 2000 Tahoe (Silverado style)
- ✔ 2000 Yukon (excluding Denali)
- ✔ 2000 Suburban 1500 / 2500
- ✔ 2000 Yukon XL 1500 / 2500
- ✔ 1999-2002 Camaro (5.7L)
- ✔ 1999-2002 Firebird (5.7L)
- ✔ 1999-2000 Corvette