Is Your C5 Corvette Running Rough? The PCM Might Be the Culprit.
The Powertrain Control Module (PCM), often called the Electronic Control Module (ECM), is the electronic brain of your 1999-2000 Chevrolet Corvette. It’s a sophisticated computer that manages everything from fuel injection and ignition timing to transmission shift points and emissions controls. When this critical component begins to fail, it can cause a cascade of frustrating and often difficult-to-diagnose problems, leaving your high-performance machine feeling sluggish, unpredictable, or even undrivable. If you’re tired of chasing phantom issues and want to restore the precision and power your Corvette is known for, you’ve come to the right place.
This is a direct-fit replacement Powertrain Control Module for your vehicle, part number 9354896. We take the guesswork and hassle out of the replacement process. Unlike a generic, off-the-shelf unit, this module is professionally programmed specifically for your car using your unique Vehicle Identification Number (VIN). This ensures that all factory parameters, security information (like the Vehicle Anti-Theft System or VATS), and operational characteristics are perfectly matched to your Corvette’s original specifications. We also load the latest available software updates from General Motors, which can resolve underlying drivability issues and improve overall performance and efficiency.
Symptoms of a Failing 1999-2000 Corvette PCM
A failing PCM can manifest in numerous ways. If you’re experiencing any of the following, it’s a strong indicator that your module may need replacement:
- ✔ Check Engine Light: An illuminated or flashing Check Engine Light is the most common sign. You may see codes related to sensor circuits, module communication errors (U-codes), or processor faults.
- ✔ No-Start or Hard Starting: The engine may crank but refuse to start, or take an unusually long time to fire up, either hot or cold.
- ✔ Poor Engine Performance: Noticeable loss of power, hesitation during acceleration, stumbling, or misfiring can all point to a faulty PCM.
- ✔ Erratic Shifting or Transmission Issues: The PCM controls the automatic transmission. A bad module can cause harsh shifts, delayed engagement, or force the transmission into limp mode.
- ✔ Reduced Fuel Economy: If the PCM isn’t correctly managing the air-fuel mixture, you’ll likely see a sudden and significant drop in your miles per gallon.
- ✔ Stalling: The engine may stall unexpectedly while driving or when coming to a stop.
- ✔ Failure to Communicate: Your mechanic’s diagnostic scan tool may be unable to establish a connection with the PCM, making diagnosis impossible.
The Importance of VIN Programming
Installing a non-programmed module from a salvage yard or another vehicle simply will not work. The PCM is tied to the specific VIN and options of the original car. Our VIN programming service makes this a plug-and-play solution. By providing us with your VIN after purchase, you receive a module that is:
- Security Ready: The module is programmed to communicate with your car’s Body Control Module (BCM) and ignition key, preventing anti-theft system lockouts.
- Option-Correct: It knows exactly what features your car has, from the type of transmission to the final drive ratio, ensuring every system functions as intended.
- Updated: It includes the latest GM software patches and improvements, which are often released to fix bugs or enhance performance long after the vehicle has left the factory.
Broad GM Compatibility
While this is a perfect solution for the 1999-2000 Corvette PCM, this versatile module, part number 9354896 (also interchangeable with 19109040 and 09354896), was used across a wide range of popular GM trucks and performance cars from that era. It is a direct replacement for the following vehicles:
- Chevrolet Corvette: 1999-2000
- Chevrolet Camaro: 1999-2002 (5.7L)
- Pontiac Firebird: 1999-2002 (5.7L)
- Chevrolet Silverado 1500/2500: 1999-2000
- GMC Sierra 1500/2500: 1999-2000
- Chevrolet Tahoe / Suburban: 2000
- GMC Yukon / Yukon XL: 2000
Please verify the part number on your original module to ensure an exact match for a seamless installation.
Frequently Asked Questions
What is a PCM and what does it do?
The Powertrain Control Module (PCM) is the main computer that controls your vehicle’s engine and transmission. It takes data from dozens of sensors to manage fuel delivery, spark timing, emissions systems, and automatic transmission shifting to ensure optimal performance, fuel economy, and low emissions.
Is any additional programming required after installation?
No. Because we program the module to your specific VIN before shipping, it is ready for installation right out of the box. In most cases, you will not need to perform any additional security relearn procedures. Just disconnect the battery, swap the module, and reconnect the battery.
How do I provide my VIN?
After you complete your purchase, you can send us a message with your 17-digit Vehicle Identification Number (VIN). We cannot ship your order until we receive this information, as the programming is a critical part of the process.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the PCM itself, then yes, this part will resolve the issue. However, if the light is on due to a faulty sensor (like an O2 sensor or MAP sensor), that part will still need to be replaced. This module will fix codes related to PCM processor errors or communication faults.
Where is the PCM located on my 1999-2000 Corvette?
On the C5 Corvette, the PCM is located in the engine compartment on the passenger (RH) side, near the firewall and behind the battery.