Is Your 1998-1999 Yukon Running Rough?
If you’re dealing with a frustrating check engine light, poor fuel economy, harsh shifting, or even a no-start condition, a failing Powertrain Control Module (PCM) is often the culprit. As the central computer for your engine and transmission, when the PCM goes bad, it can cause a host of problems that are impossible to ignore. I’ve seen it hundreds of times in my shop: a customer comes in after replacing sensors and parts, only to find the root cause was the engine computer all along.
This isn’t just a replacement part; it’s a direct solution. We are offering a genuine, used OEM GM engine computer that has been meticulously tested and is ready for installation. The best part? We program it specifically to your vehicle’s VIN before it ships, loading it with the latest GM software updates. This eliminates the need for an expensive trip to the dealership for programming.
The Plug-and-Play Solution for Your 1998-1999 Yukon PCM
Getting your truck or SUV back to factory-spec performance shouldn’t be a complicated ordeal. This module is designed to restore function and reliability without the typical dealership hassle. It’s the same component that managed your vehicle when it was new, now updated and matched to your specific vehicle.
Real-World Diagnostic Story
“A customer’s ’99 Yukon came in last week with these exact symptoms: it would crank but not start, and when it did run, it shifted erratically. The owner had already replaced the fuel filter and crank sensor. After confirming power and ground to the module, my scan tool couldn’t communicate with the factory PCMโa classic sign of internal failure. A pre-programmed replacement like this one had the vehicle running smoothly in under 30 minutes. It’s a common failure point I’ve diagnosed on over 100 GMT400 platform trucks.”
Common Symptoms of a Failing PCM:
- โ Persistent Check Engine Light (CEL)
- โ Vehicle won’t start or is difficult to start
- โ Poor or erratic engine performance
- โ Decreased fuel efficiency
- โ Harsh or incorrect automatic transmission shifting
- โ Failure to pass emissions testing
Simple Installation Guide
You can do this yourself with basic hand tools. Hereโs a general guide:
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the PCM: On most 1998-1999 Yukons, Tahoes, and Suburbans, the PCM is located in the engine compartment on the driver’s side, near the firewall or inner fender.
- Disconnect Connectors: Carefully unplug the wiring harness connectors from the old PCM. There are typically release tabs that need to be pressed or lifted.
- Remove Old Unit: Unbolt the PCM from its mounting bracket and remove it from the vehicle.
- Install New Unit: Mount the new, pre-programmed PCM onto the bracket and securely reconnect the wiring harnesses. Ensure they click into place.
- Reconnect Battery: Reattach the negative battery terminal. Your vehicle is now ready to start.
Guaranteed Compatibility
This module is a direct replacement for several part numbers. To ensure a perfect match, please verify your original part number is on this list. This unit, often identified by the service ID 9355699, is compatible with:
- โ Part Numbers: 09355699, 16266645, 16250279, 16258815, 09366810
- โ Key Models: 1998-1999 GMC Yukon, Chevy Tahoe, Suburban, Cadillac Escalade, as well as various Chevrolet/GMC Pickups, Express/Savana Vans, and other models from the era. Please see the detailed fitment list to confirm your specific vehicle.
IMPORTANT: After your purchase, you must provide us with your 17-digit Vehicle Identification Number (VIN) so we can program the module correctly. This step is critical for a successful installation.