Is Your GM Truck or Van Acting Up?
If you’re dealing with frustrating issues like a persistent check engine light, erratic idling, stalling, or harsh shifting in your 1998-1999 GM vehicle, the problem might be deeper than a simple sensor. As the brain of your engine, a failing Powertrain Control Module (PCM) can cause a cascade of confusing symptoms that are often misdiagnosed. I’ve spent two decades under the hood of these trucks, and I’ve seen firsthand how a faulty PCM can mimic everything from a bad fuel pump to a failing transmission.
From the Shop Floor: A Real-World Scenario
“A customer’s ’99 Tahoe came in last week with a classic no-start after it warmed up. He’d already replaced the fuel pump and filter, but the problem persisted. After confirming fuel pressure and spark were dropping out together, we hooked up our scanner and saw erratic data from the PCM. The internal processor was failing under heat soak. We installed one of these pre-programmed modules, and the truck fired right up and has run perfectly ever since. It’s a common failure point I’ve diagnosed hundreds of times on these GMT400 platforms.”
The Direct-Fit Solution: Programmed & Ready to Install
This isn’t just a part in a box; it’s a complete solution. We are offering a genuine, used OEM PCM, part number 09355699, that has been meticulously tested and is ready for service. The most critical step is already done for you: we flash the module with the latest GM-certified software specifically for your vehicle using the VIN you provide. This ensures all parameters for your engine, transmission, and emissions equipment are correct right out of the box.
- ✔ Eliminate Guesswork: Solves common issues like stalling, no-start conditions, poor fuel economy, and false sensor codes.
- ✔ VIN-Programmed: We load the correct software for your exact vehicle. No expensive dealer programming needed.
- ✔ Latest GM Updates: Your module arrives with software updates that can resolve factory bugs related to idle stability and transmission performance.
- ✔ OEM Reliability: A genuine, road-tested part you can trust, not a cheap knock-off.
Easy Installation for Your 1998-1999 Yukon PCM
You don’t need to be a master mechanic to get your truck running right again. This module is designed for a straightforward, plug-and-play installation. After you complete your purchase, simply send us your vehicle’s 17-digit VIN, and we’ll handle the programming before we ship.
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the PCM: On most of these trucks and vans, the PCM is located in the engine compartment, typically on the driver’s side fender or near the battery.
- Disconnect Connectors: Carefully unclip the wiring harness connectors from the old module. Inspect the pins for any corrosion or damage and clean them with contact cleaner if necessary.
- Swap the Module: Unbolt the old PCM and secure the new, programmed module in its place.
- Reconnect Everything: Firmly plug the wiring harnesses into your new PCM and reconnect the negative battery terminal.
- Security Relearn (If Needed): In some cases, a simple 10-30 minute security relearn procedure may be required. This is an easy process you can do yourself with just the ignition key. We include instructions for this.
Guaranteed Compatibility
This Electronic Control Module is a direct replacement for units with service number 09355699. It is also fully interchangeable with the following part numbers:
- 16266645
- 9355699
- 16250279
- 16258815
- 09366810
- 9366810
This unit fits a wide range of GM models from 1998-1999, including the Chevrolet Tahoe, Suburban, C/K Pickups, Express Van, GMC Sierra, Savana Van, Cadillac Escalade, and more, as long as the original part number matches. Please verify the part number on your current module to ensure a perfect match.