Restore Peak Performance to Your GM Vehicle
Is your GMC Envoy, Chevy truck, or GM van running rough, shifting erratically, or showing a persistent Check Engine Light? These are classic signs of a failing Powertrain Control Module (PCM), the central computer responsible for managing your engine’s performance and efficiency. A faulty PCM can lead to a frustrating driving experience, poor fuel economy, and even a no-start condition. This direct-fit replacement PCM is the reliable solution to get your vehicle running like new again.
This module is meticulously programmed to your vehicle’s specific Vehicle Identification Number (VIN) before it ships. This critical step ensures that all factory settings for the engine, transmission, and emissions systems are perfectly matched to your vehicle’s original specifications. We load the latest software updates from GM, often correcting underlying issues and improving overall vehicle operation. This isn’t just a replacement part; it’s a restoration of your vehicle’s core operational logic.
From the Diagnostic Bay
We had a 1999 Chevy Silverado 2500 come into the shop with a complaint of harsh, unpredictable shifting and a P0753 (Shift Solenoid ‘A’ Electrical) code. The owner had already replaced the transmission solenoids twice with no success. After hooking up our scanner and monitoring the data stream, we noticed the PCM was commanding the solenoid on and off erratically, even when it shouldn’t have been. Instead of throwing more transmission parts at it, we identified the PCM driver circuit as the root cause. We installed a VIN-programmed module just like this one, performed the security relearn, and the truck shifted perfectly. The customer was thrilled to have a simple, definitive fix after weeks of chasing the wrong problem.
Diagnosing Your 1998-2000 Envoy PCM
A failing powertrain module can manifest in various ways, often mimicking other sensor or component failures. If you’re experiencing several of the following symptoms, your PCM is a likely culprit. This module is the correct solution for a wide range of GM trucks, SUVs, and vans from this era, restoring communication between all essential systems.
Common Symptoms of a Failing PCM
- ✔ Unexplained Check Engine Light illumination
- ✔ Rough or inconsistent engine idling
- ✔ Poor acceleration and overall loss of power
- ✔ Decreased fuel efficiency
- ✔ Harsh or delayed automatic transmission shifting
- ✔ Engine stalling or failing to start
- ✔ Communication errors with diagnostic scan tools
Guaranteed Compatibility and Simple Installation
This module is a direct replacement for multiple OEM part numbers, including 16263494, 16265035, and 8162634940. By providing your VIN upon purchase, you guarantee that the module you receive is 100% compatible and ready for installation. In most cases, installation is a straightforward plug-and-play process. While the module is pre-programmed, some vehicles may require a simple security or anti-theft relearn procedure, which can typically be done without special tools. A Crankshaft Variation Relearn (CASE Relearn) may also be necessary to clear certain trouble codes, which can be performed by any qualified technician.
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) contains critical information about your vehicle’s specific options, engine, transmission, and emissions equipment. We use the VIN to load the exact GM-certified software and calibrations, ensuring the module functions perfectly with your vehicle’s systems right out of the box.
Is this a plug-and-play part?
Yes, this PCM is designed to be a plug-and-play solution. Because it is pre-programmed to your VIN, no additional programming is required for engine or transmission operation. However, depending on your vehicle’s specific anti-theft system, you may need to perform a simple security relearn procedure, which takes a few minutes and does not require special tools.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM directly controls the transmission’s electronic solenoids to manage shifting. If your vehicle has erratic shifting, harsh engagement, or transmission-related trouble codes that aren’t resolved by replacing internal components, a faulty PCM is a very common cause.
What is a CASE Relearn?
A CASE (Crankshaft Angle Sensor Error) Relearn is a procedure that synchronizes the new PCM with the engine’s crankshaft position sensor. If this is not performed, you may have a persistent P1336 trouble code. While the vehicle will run and drive without it, the procedure is required to turn off the check engine light for that specific code. Any professional scan tool can perform this relearn in a few minutes.
How do I confirm this part fits my vehicle?
Please check the extensive fitment list provided on this page. The most important step is to match your original module’s part number to one of the compatible numbers listed (e.g., 16263494). Providing your VIN is the final step to guarantee a perfect match.