Is Your 1998 or 1999 GM Truck Running Rough?
If your Tahoe, Yukon, or Suburban is suddenly stalling, shifting erratically, or refusing to start altogether, a failing Powertrain Control Module (PCM) is a very likely culprit. After 20+ years on the road, the original electronics in these workhorse vehicles are prone to failure from heat cycles and vibration. In my shop, I’ve seen countless GMT400-platform trucks come in with confusing symptoms that all trace back to the engine computer. You might be chasing phantom sensor codes or even replacing perfectly good fuel pumps, when the brain of the operation is the real issue.
This isn’t just a replacement part; it’s a direct solution. We are offering a reliable, used OEM PCM that restores the performance and reliability of your vehicle. This module, identified by part number 16266645 and service number 09355699, is the correct computer for a massive range of Chevrolet and GMC trucks and vans from this era.
Real-World Diagnostic Story
“A customer’s ’99 Tahoe came in last week with a classic no-start condition after it sat in the sun. The owner had already replaced the battery and the ignition coil, with no luck. The scanner wasn’t communicating with the PCM at all. We popped the hood, located the PCM on the driver’s side fender, and felt it—it was scorching hot. After letting it cool for an hour, the truck fired right up. This intermittent failure, especially when hot, is a textbook sign of internal PCM failure. We installed one of our pre-programmed modules, and the customer was back on the road that same day, problem solved.”
Why Choose Our Programmed 1998-1999 Tahoe PCM?
Getting your truck back to factory-spec operation is our priority. This isn’t just a used part pulled from a yard; it’s a fully prepared component ready for installation. The key is our professional programming service, which is included with your purchase.
- ✔ VIN-Specific Programming: We flash the module with the latest official GM software updates using your vehicle’s VIN. This ensures all parameters for the engine, transmission, and emissions systems are perfectly matched to your truck.
- ✔ Plug-and-Play Solution: Because the programming is done before we ship, you can avoid a costly trip to the dealership. No additional programming or setup is required.
- ✔ Resolves Common Issues: A functioning PCM will fix problems like harsh shifting, poor fuel economy, false Check Engine Light codes, and intermittent stalling.
- ✔ Broad Compatibility: This module is a direct replacement for multiple part numbers, including 09355699, 16266645, 16250279, 16258815, and 09366810.
Simple Installation: Get Back on the Road Fast
You don’t need to be a master technician to replace your PCM. The process is straightforward and can be done with basic hand tools in your driveway.
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the PCM: On most 1998-1999 Tahoe, Yukon, and pickup models, the PCM is located in the engine compartment on the driver’s side, near the firewall or inner fender.
- Disconnect the Harnesses: Carefully unplug the electrical connectors from the old module. Inspect the pins and connectors for any corrosion or damage. Clean them with an electrical contact cleaner if necessary for a solid connection.
- Swap the Modules: Unbolt the old PCM from its bracket and secure the new one in its place.
- Reconnect Everything: Plug the wiring harnesses firmly into the new PCM and reconnect your battery terminal.
- Final Check: Start the vehicle. The check engine light may stay on for a short period as the system runs its self-checks. The vehicle is now ready to drive.
Important: After placing your order, please send us your vehicle’s 17-digit VIN. We cannot ship your part until we have this information to complete the essential programming process.