Is Your GMC Envoy Acting Up?
If you’re dealing with a 1998, 1999, or 2000 GMC Envoy that’s suddenly developed a mind of its own, you’re not alone. I’ve seen these trucks in my bay for years with a frustrating list of symptoms: a stubborn check engine light that won’t go away, harsh or erratic transmission shifting, a sudden drop in fuel economy, or even a dreaded no-start condition where it just cranks and cranks. Often, the root cause isn’t a bad sensor or a faulty wire, but the very brain of the operation: the Powertrain Control Module (PCM).
From the Shop Floor: “A customer’s 1999 Envoy came in last week with these exact symptoms. It had a random misfire code (P0300) that we couldn’t pin down, and the transmission would slam into gear intermittently. The owner had already replaced plugs, wires, and the crankshaft position sensor. After hooking up my high-level scan tool and monitoring the data stream, I saw erratic voltage readings and slow communication from the PCM. That’s the tell-tale sign. The internal processors and capacitors on these older modules simply wear out from millions of heat cycles and constant electrical load. We installed one of our pre-programmed modules, performed the security relearn, and the truck ran smoother than it had in years.”
The Right Solution: A Reliable, Programmed PCM
Don’t waste time and money chasing phantom issues or installing a junkyard module that could have the same problems (or worse). This Powertrain Control Module is the definitive solution for your vehicle. We take the guesswork out of the repair by programming the module specifically for your truck using your Vehicle Identification Number (VIN). This ensures all the factory settings and, more importantly, the latest software updates from GM are loaded and ready to go.
These updates are critical, as they often address drivability and performance issues that were discovered after the vehicle left the factory. This is something a generic, un-programmed module can’t offer.
Why Choose Our Programmed Module?
- โ VIN-Specific Programming: We flash the module with the latest GM calibration for your exact vehicle. Just provide your VIN after purchase.
- โ Solves Common Issues: Directly addresses problems like false check engine lights, poor engine performance, erratic shifting, and no-start conditions related to a faulty PCM.
- โ No Dealer Visit Required: This module arrives ready for installation, saving you the time and expense of having a dealership program it.
- โ Direct-Fit Replacement: Guaranteed to fit and function correctly in a wide range of GM trucks and vans. Please verify your part number.
Installation and Compatibility
This module is a direct replacement for several part numbers, including:
- โ 16263494
- โ 16265035
- โ 8162634940
- โ 218-11787
- โ 21811787
On the 1998-2000 GMC Envoy, this module is typically located in the right-hand (passenger side) front of the engine compartment. While installation is straightforward for a DIYer with mechanical experience, please note that you may need to perform a security relearn procedure (often called a Passlock or VATS relearn) after installation. This procedure is simple, requires no special tools, and instructions are widely available online or in service manuals. It allows your vehicle’s anti-theft system to recognize the new PCM.