Is Your 1998-1999 GMC Yukon or GM Truck Running Rough?
If your trusty GM truck or van is suddenly plagued by a persistent Check Engine Light, erratic shifting, stalling, or a frustrating no-start condition, the culprit is often the brain of the operation: the Powertrain Control Module (PCM). As a mechanic with over two decades of experience under the hood of these GMT400 platform vehicles, I’ve seen firsthand how a failing PCM can mimic a dozen other expensive problems. Don’t waste time and money chasing phantom sensor or transmission issues. This is your direct, reliable solution.
This is a thoroughly tested, genuine used GM PCM that is a direct replacement for part number 16258815 and other interchangeable numbers listed below. The most critical service we provide is programming it specifically to your vehicle’s VIN before it ships. This isn’t just a generic module; it’s loaded with the latest GM software updates, ensuring it communicates flawlessly with your engine, transmission, and other systems right out of the box.
Why Choose Our Programmed 1998-1999 Yukon PCM?
Getting your truck back to factory-spec performance is our top priority. A correctly programmed PCM is essential for everything from fuel economy to transmission shift points. When you order from us, you’re not just buying a part; you’re getting a comprehensive service that eliminates guesswork and costly trips to the dealership.
- โ VIN-Programmed for You: We flash the module with your vehicle’s specific VIN and the newest GM calibrations. This ensures 100% compatibility.
- โ Solves Common Issues: A direct fix for symptoms like harsh shifting, poor fuel mileage, random stalling, and communication error codes (U-codes).
- โ Cost-Effective Solution: Avoid the high costs and programming fees associated with a new module from a dealer. This is a dependable part from a salvaged vehicle, tested and ready for service.
- โ Broad Compatibility: This module, identified by service number 9355699 on the sticker, fits a massive range of 1998-1999 GM trucks and vans.
Expert Pro Tip: Don’t Forget the Security Relearn!
A customer’s ’99 Tahoe came in last week with a no-start condition right after they installed a PCM from another supplier. The engine would crank but never fire. The issue wasn’t the part; it was the GM Vehicle Anti-Theft System (VATS/Passlock). After installing your new PCM, the system needs to relearn the module’s signature. It’s a simple, 30-minute procedure you can do yourself with just the keyโno special tools needed. We include instructions for this vital step to prevent the exact same headache.
Easy DIY Installation Guide
You can get this job done in your driveway in under an hour. Follow these simple steps to replace your 1998-1999 Yukon PCM:
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the Old PCM: On most of these trucks and vans (like the Yukon, Tahoe, and C/K Pickups), the PCM is located in the engine compartment, typically on the driver’s side fender well, housed in a black plastic bracket.
- Disconnect the Wiring: Carefully unplug the wiring harness connectors from the old module. There are typically three large multi-pin connectors. Use a small flathead screwdriver to gently pry up the locking tabs if needed.
- Remove the Module: Unbolt the PCM from its mounting bracket and remove it from the vehicle.
- Install the New PCM: Seat your new, pre-programmed PCM into the bracket and securely plug in the wiring harnesses. You should hear a ‘click’ as they lock into place.
- Reconnect and Relearn: Reconnect the negative battery terminal. Now, perform the Security Relearn Procedure (instructions provided with your order). This will sync the new PCM with your truck’s anti-theft system.
- Start and Verify: Start the engine. The Check Engine Light should be off, and your truck should run and shift smoothly.
Guaranteed Fitment
This Electronic Control Module is a direct fit for a wide variety of GM vehicles. Please match your original part number to one of the following for guaranteed compatibility: 09355699, 16266645, 9355699, 16250279, 16258815, 09366810, 9366810. If you are unsure, please send us your VIN, and we will verify the fitment for you before you order. This ensures you get the right part for your vehicle, whether it’s a Chevy Express, GMC Savana, Cadillac Escalade, or Isuzu Hombre.