Restore Peak Performance to Your GM Truck or Van
If you’re dealing with a frustrating no-start condition, a persistent Check Engine Light, or erratic engine behavior in your 1999-2000 Chevy Tahoe, the root cause is often a failing Powertrain Control Module (PCM). As the ‘brain’ of your vehicle, when the PCM starts to go, it can create a cascade of problems that are difficult to diagnose. After 20 years in the garage, I’ve seen countless GMT400 and early GMT800 trucks sidelined by faulty engine computers. This isn’t just a part; it’s the central command for your engine’s fuel delivery, spark timing, and transmission shifting. Getting it right is critical.
This replacement PCM is the reliable, straightforward solution you need. We take the guesswork and the expensive dealership trip out of the equation. Before we ship it, we flash the module with the latest official GM software updates, programmed specifically to your vehicle’s VIN. This ensures that when it arrives, it’s ready for installation, communicating perfectly with your truck’s systems right out of the box. A faulty computer can make even the most reliable Vortec engine feel sluggish and unresponsive. By replacing your failing unit with this correctly programmed 1999-2000 Tahoe PCM, you’re not just fixing a problem—you’re restoring the drivability and efficiency you depend on.
From the Diagnostic Bay
I remember a 2000 Tahoe that came into the shop with a complaint of intermittent stalling at stoplights. The owner had already replaced the fuel pump and idle air control valve with no luck. We scanned it and found no hard codes, just a history of random communication loss DTCs. On a hunch, we monitored the PCM’s live data stream. Sure enough, we saw sensor readings dropping out sporadically. The internal board of the original PCM was failing under heat soak. We installed a VIN-programmed module just like this one, and the truck ran perfectly. It’s a classic failure mode for these units, and a pre-flashed replacement is the fastest, most reliable fix.
Is Your GM Truck or Van Showing These Symptoms?
A failing PCM can manifest in various ways. If you’re experiencing any of the following, it’s a strong indicator that your engine computer needs attention:
- ✔ Check Engine Light is on with codes like P0601 (Internal Control Module Memory Check Sum Error) or other communication errors.
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained drops in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ The vehicle stalls unexpectedly, either while driving or at idle.
- ✔ Failure to pass an emissions test.
A Straightforward Guide to PCM Installation
Installing your new 1999-2000 Tahoe PCM is a job most DIYers can handle with basic tools. Following the correct procedure is key to a smooth process.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- Locate the PCM: On most trucks like the Tahoe, Silverado, and Sierra, the PCM is located in the engine compartment, typically on the driver’s side fender well or near the battery. On Express/Savana vans, it’s often in the LH rear of the engine compartment.
- Disconnect the Harnesses: Carefully unclip and remove the electrical connectors from the old PCM. These connectors have locking tabs that need to be released. Avoid pulling on the wires themselves.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket. Keep the hardware as you will reuse it.
- Install the New Module: Mount your new, pre-programmed PCM onto the bracket and secure it with the original hardware.
- Reconnect Everything: Firmly plug the electrical harnesses into the new PCM until they click into place. Reconnect your vehicle’s negative battery terminal.
- Security Relearn (If Necessary): In some cases, a security relearn procedure may be required. This typically involves cycling the key and can be done without special tools. We include instructions for this simple process.
Verified Vehicle Compatibility
This module is a direct-fit replacement for a wide range of GM trucks and vans. It is compatible with part numbers 16263494, 16265035, and 8162634940. While it is a primary solution for the 1999-2000 Tahoe PCM, it also fits many other models including the Chevrolet Silverado, GMC Sierra, Express, Savana, S10/Sonoma, Blazer/Jimmy, and Cadillac Escalade. Please review the detailed fitment list to confirm this is the correct part for your specific year, model, and engine.
Frequently Asked Questions
Do I need to do any programming myself?
No. We handle all the programming for you before shipping. Simply provide your vehicle’s 17-digit VIN during checkout, and we will flash the module with the latest GM software for your specific vehicle. It arrives ready to install.
What is a VIN and where do I find it?
The VIN (Vehicle Identification Number) is a unique 17-digit code for your truck. You can find it on your vehicle’s registration, insurance card, or on a metal plate on the driver’s side of the dashboard, visible through the windshield.
Is this a difficult part to install for a DIYer?
Not at all. With basic hand tools, most people can swap a PCM in under 30 minutes. The most important steps are disconnecting the battery first and ensuring the electrical connectors are fully seated on the new module.
Will this fix my ‘No Start’ problem?
If the ‘No Start’ is caused by a failed PCM, then yes, this will resolve the issue. Common signs of a PCM-related no-start include the engine cranking normally but not firing, or a lack of communication with your scan tool.
Does this part have other names?
Yes, this part is commonly referred to as a Powertrain Control Module (PCM), Engine Control Module (ECM), or simply an engine computer. They all refer to the same component.