Programmed 1998-1999 Yukon PCM | ECM Engine Computer | 16258815

Restore Peak Performance to Your GM Truck or Van

If you’re dealing with frustrating issues like a persistent check engine light, erratic engine behavior, stalling, or poor fuel mileage in your 1998-1999 GMC Yukon or related GM vehicle, a failing Powertrain Control Module (PCM) is often the culprit. As the ‘brain’ of your vehicle, the PCM controls everything from fuel injection and spark timing to transmission shifting. When it falters, the symptoms can be confusing and difficult to diagnose. This isn’t just an inconvenience; it affects your vehicle’s reliability and safety.

This is a dependable, used OEM PCM that has been meticulously tested and is ready for service. The most significant benefit we offer is our professional programming service. Before we ship this module, we will flash it with the latest GM software updates using the unique Vehicle Identification Number (VIN) from your truck. This critical step ensures the computer communicates perfectly with your vehicle’s specific systems, eliminating the need for an expensive trip to the dealership for programming. You get a part that’s truly ready to install right out of the box.

Is Your GM Truck Showing These Symptoms?

• ✔ Check Engine Light is illuminated with codes like P0601, P0605, or U-series communication codes.
• ✔ The engine cranks but refuses to start.
• ✔ Unexplained stalling or rough idling, especially when warm.
• ✔ A noticeable drop in fuel economy.
• ✔ Harsh or erratic automatic transmission shifting.
• ✔ The vehicle fails to pass an emissions test.
• ✔ Other modules (like the ABS or airbag system) are setting communication error codes.

A Straightforward Guide to Installation

Installing your pre-programmed 1998-1999 Yukon PCM is a job most DIYers can handle in under an hour with basic hand tools. This process gets your vehicle back to factory-spec operation without complex procedures.

1. Safety First: Always disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
2. Locate the PCM: On most of these trucks and vans, the PCM is located in the engine compartment, typically on the driver’s side inner fender or near the battery.
3. Disconnect the Connectors: Carefully unclip and remove the electrical wiring harnesses from the old PCM. These connectors have locking tabs that need to be released before pulling. Avoid forcing them.
4. Remove the Old Module: Unbolt the old PCM from its mounting bracket. There are usually two or three bolts holding it in place.
5. Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and secure it with the bolts.
6. Reconnect Everything: Plug the wiring harnesses firmly into the new module until they click into place. Reconnect the negative battery terminal.
7. Final Steps: In many cases, you may need to perform a security relearn procedure or a Crankshaft Variation (CASE) relearn. This can often be done without a scan tool (consult a service manual for your specific vehicle) and is necessary for optimal performance.

Verified Vehicle Compatibility

This module is a direct replacement for service number 16258815 and is compatible with several other part numbers including 09355699, 16266645, 9355699, 16250279, 09366810, and 9366810. It is confirmed to fit a wide range of GM trucks and vans. Please verify your vehicle is on the list below and that the service ID on your original computer is 09355699.

Frequently Asked Questions