Is Your 1998 Envoy Running Rough, Stalling, or Throwing Codes?
If you’re dealing with a frustrating Check Engine Light, unpredictable stalling, or poor engine performance in your GMC Envoy, the problem often points directly to a failing Powertrain Control Module (PCM). Over my 20+ years in the shop, I’ve seen these exact issues on hundreds of late-90s GM vehicles. The PCM is the brain of your engine, and when it starts to fail, it can cause a cascade of problems that are impossible to ignore.
The Smart Solution: A VIN-Programmed, Ready-to-Install PCM
Instead of paying dealership prices for a new module and expensive programming fees, this is your direct-fit, cost-effective solution. We are offering a genuine, used GM engine computer that has been thoroughly tested for full functionality. The most important part? We program it specifically to your vehicle’s VIN before it ships. This means it arrives at your door loaded with the latest GM software updates for your exact vehicle, ready for a straightforward installation.
- โ Eliminate Guesswork: Solves common issues like false sensor codes, harsh shifting, and no-start conditions.
- โ Save Time and Money: Arrives pre-programmed to your VIN. No need for a dealer visit or specialized scan tools for programming.
- โ Restore Original Performance: Loaded with the correct GM software to manage fuel, spark, and emissions as intended.
- โ Guaranteed Compatibility: This module is a direct replacement for part numbers 09355699, 16266645, 16250279, 16258815, and 9366810.
Expert Pro Tip: Before you plug in your replacement PCM, take five minutes to inspect the main harness connectors. On these late-90s GM trucks and SUVs, I’ve seen countless cases where a perfectly good replacement module is damaged by corroded pins or a brittle connector housing. Use a small pick and some quality electrical contact cleaner to gently clean each pin socket. A solid connection is just as important as a good module.
Easy Installation for the DIY Mechanic
You can get your truck back to peak condition right in your own driveway. Replacing the 1998 Envoy PCM is a simple process that requires basic hand tools. Just follow these steps:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before working on any electronic components.
- Locate the PCM: On the 1998 GMC Envoy, the PCM is typically found in the engine compartment on the right-hand (passenger) side.
- Disconnect the Harnesses: Carefully unclip and remove the electrical connectors from the old module. Inspect them for any signs of corrosion or damage as noted in the tip above.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket and remove it from the vehicle.
- Install the New Module: Mount your new, pre-programmed PCM onto the bracket, reconnect the electrical harnesses securely, and then reconnect your battery terminal.
- Final Step: Your vehicle may need to complete a security relearn procedure, which can often be done by cycling the key. The specific procedure is simple and can be found in your owner’s manual or online.
Broad Compatibility Across the GM Lineup
While this is a perfect fit for the 1998 Envoy PCM requirement, this versatile module (identified by service ID 9355699) is also the correct part for a huge range of popular GM trucks and vans from that era. This includes various Chevrolet/GMC Pickups (1500, 2500, 3500), Suburban, Tahoe, Yukon, Express/Savana vans, Blazer/Jimmy, and more. Please verify your part number or consult the detailed fitment list to ensure this is the correct module for your specific vehicle and options.
IMPORTANT: After your purchase, you must provide us with your vehicle’s 17-digit VIN to ensure we can program the module correctly before shipment. This step is critical for a successful installation.