Programmed 1999-2000 Tahoe Powertrain Control Module PCM 8162634940

Restore Your Truck’s Brainpower and Performance

As a technician with over two decades of experience under the hood, I’ve seen firsthand how a failing Powertrain Control Module (PCM) can turn a reliable truck into a source of constant frustration. If your 1999-2000 Tahoe, or another compatible GM vehicle, is suffering from a persistent check engine light, erratic shifting, poor fuel economy, or a no-start condition, the PCM is often the culprit. It’s the central computer of your vehicle, and when it starts to fail, it affects everything. This isn’t just a part; it’s the solution to getting your trusted vehicle running like it should.

We take the guesswork and expensive dealership trips out of the equation. This replacement PCM, compatible with part numbers including 16263494 and 8162634940, arrives at your door completely programmed to your vehicle’s specific VIN. We flash it with the latest official GM software updates, ensuring optimal performance, fuel efficiency, and emissions compliance right out of the box. This means no extra tools, no expensive subscriptions, and no towing it to a shop just for programming. It’s the most direct path to a reliable repair.

Is Your GM Truck Showing These Signs?

A failing PCM can manifest in numerous ways. If you’re experiencing any of the following, it’s a strong indicator that your module needs attention. Often, you’ll see diagnostic trouble codes (DTCs) like P0601, P0605, or various communication errors.

• ✔ Persistent Check Engine Light (CEL)
• ✔ Engine stalling or misfiring for no apparent reason
• ✔ Harsh or erratic automatic transmission shifting
• ✔ A noticeable drop in fuel economy
• ✔ Failure to pass state emissions testing
• ✔ The vehicle won’t start, but the battery and starter are good
• ✔ Communication errors with diagnostic scan tools

A Straightforward Guide to Your 1999-2000 Tahoe Powertrain Control Module Installation

Installing your new, pre-programmed PCM is a manageable job for a confident DIYer. The location can vary slightly by model (see fitment list), but the process is generally similar for most of these GM trucks and vans.

1. Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 10 minutes to ensure all electrical systems are discharged.
2. Locate the Old PCM: On most 1999-2000 Tahoes, Yukons, and pickups, the PCM is located in the engine compartment, typically on the driver’s side near the firewall or battery tray. On Express/Savana vans, it’s often in the LH rear of the engine compartment.
3. Disconnect the Harnesses: Carefully unclip and remove the electrical wiring harnesses connected to the module. These connectors have locking tabs that need to be released before you can pull them off. Avoid forcing them.
4. Remove the Module: Unbolt the old PCM from its mounting bracket. Keep the hardware, as you may need to reuse it.
5. Install the New PCM: Mount your new, pre-programmed module in the same location and secure it with the original hardware.
6. Reconnect and Secure: Firmly plug the wiring harnesses back into the new PCM until they click into place, ensuring a solid connection. Reconnect your vehicle’s negative battery terminal.
7. Perform a Relearn (If Necessary): While not always required, some vehicles may need a security or crank-position sensor relearn procedure. For many, simply turning the key to the ‘On’ position for 10-15 seconds before starting is sufficient. Your vehicle is now ready to go!

Verified Fitment for Your GM Vehicle

This module is a direct replacement for a wide range of GM trucks and vans. Please verify your vehicle is on this list. Matching the service ID number (e.g., 16263494) on your original module is the best way to ensure perfect compatibility.