Restore Peak Performance to Your GM Truck or SUV
Is your GMC Envoy, Chevy S10, or other compatible GM vehicle suffering from frustrating engine issues? Stalling, rough idling, poor fuel mileage, or an illuminated Check Engine Light are common indicators of a failing Powertrain Control Module (PCM). As the central computer for your engine and transmission, a faulty PCM can cause a wide range of performance problems. This direct-fit replacement PCM, part number 8162634940, is the reliable solution to get your vehicle running smoothly again.
The Plug-and-Play Solution for Your 1998-2000 Envoy PCM
Replacing an engine computer can be intimidating, but we make it simple. Unlike modules from a salvage yard or other retailers, this PCM comes fully programmed to your vehicle’s specific Vehicle Identification Number (VIN). We install the latest GM-certified software updates, ensuring optimal performance, fuel efficiency, and emissions control. This critical programming step means no expensive trips to the dealership for flashing. It’s designed to be a straightforward installation, getting you back on the road with confidence.
From the Diagnostic Bay
We had a 1999 Chevy Blazer come in that was driving the owner crazy. It had a random, intermittent misfire that wouldn’t set a specific code, just a general P0300. The owner had already replaced plugs, wires, the cap, and the rotor. We scoped the injector and ignition signals and noticed the control signal for cylinder 3 would occasionally drop out. After checking the wiring harness for continuity, we traced the fault to a weak driver circuit inside the original PCM. We installed one of these VIN-programmed modules, performed the security relearn, and the Blazer ran perfectly. It’s a classic example of how a failing PCM can mimic other component failures.
Common Symptoms of a Failing PCM
- ✔ Persistent Check Engine Light (CEL)
- ✔ Engine stalling, stumbling, or misfiring
- ✔ Noticeable decrease in fuel economy
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Failure to pass state emissions testing
- ✔ Intermittent starting problems or complete no-start condition
- ✔ Communication errors with diagnostic scan tools
This module is a direct replacement for multiple part numbers, including 16263494, 16265035, and 8162634940. It fits a wide variety of popular GM trucks, vans, and SUVs from the late 90s and early 2000s, including the Chevrolet Silverado, GMC Sierra, Chevy Express, and many more. Please use the detailed fitment list to confirm compatibility with your exact model and year. Ordering the correct 1998-2000 Envoy PCM is crucial for restoring your vehicle’s factory operation.
Frequently Asked Questions
Do I need to get this PCM programmed?
No. We handle all the programming for you before shipment. Simply provide us with your vehicle’s VIN during or after checkout, and we will flash the module with the latest GM software specific to your vehicle.
What is a VIN and where do I find it?
The VIN is your 17-digit Vehicle Identification Number. You can typically find it on a plate on the driver’s side dashboard (visible through the windshield), on the driver’s side door jamb sticker, or on your vehicle’s registration and insurance documents.
Will this fix my specific problem or Check Engine Light?
This PCM will resolve any issues directly caused by a faulty module. While a bad PCM is a common cause for many of the symptoms listed, it’s essential to ensure your vehicle has been properly diagnosed. Other issues, such as faulty sensors or wiring problems, can cause similar symptoms.
Is any additional setup required after installation?
In many cases, this is a plug-and-play installation. However, some GM vehicles of this era may require a Security Relearn procedure (also known as a Passlock or VATS relearn) to allow the vehicle to start. This procedure can typically be done without special tools and instructions are widely available online or in service manuals.
How do I provide my VIN?
You can add your VIN to the notes section during checkout or send it to us in a message after you complete your purchase. We cannot program and ship your module without a valid VIN.