Restore Peak Performance to Your GM Truck or SUV
Is your 1998-2000 Oldsmobile Bravada, or another compatible GM vehicle, suffering from frustrating and unpredictable issues? A faulty Powertrain Control Module (PCM), the computer brain of your vehicle, is often the culprit behind problems like poor idling, erratic transmission shifting, a persistent Check Engine Light, or even a no-start condition. This replacement PCM is the reliable, straightforward solution to get your vehicle running smoothly again. It’s not just a part; it’s a fix that restores the communication and precision your engine and transmission need to operate as designed.
We take the guesswork and hassle out of the repair. Unlike sourcing a module from a salvage yard and paying for expensive dealership programming, this unit arrives at your door ready for installation. We flash it with the latest official GM software updates, tailored specifically to your vehicle’s VIN. This ensures seamless integration and optimal performance, addressing any factory software bugs that may have been discovered over the years. This is the most efficient way to solve complex electronic issues and get back on the road with confidence.
A Technician’s Notebook
I remember a ’99 GMC Jimmy with the 4.3L V6—the same powertrain as in many of these Bravadas—that came into my shop. The owner was at his wit’s end. He had already replaced the fuel pump and ignition module trying to chase down an intermittent stalling problem. His scanner wasn’t showing any fuel or spark-related codes, just a persistent P0601 (Internal Control Module Memory Check Sum Error). This code is a direct indictment of the PCM itself. We installed a VIN-programmed module just like this one, and the problem was solved instantly. It’s a powerful reminder that starting with the brain can save hundreds in wasted parts and diagnostic time.
Common Signs of a Failing PCM
- ✔ Persistent Check Engine Light, especially with codes like P0601, P0602, or P0605.
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained stalling or rough, inconsistent idling.
- ✔ Harsh or delayed transmission shifting.
- ✔ A noticeable drop in fuel economy.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Failure to pass an emissions inspection due to readiness monitor issues.
A Straightforward Guide to Installation
- ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental contact.
- ✔ Locate the PCM: On most of these vehicles, such as the Bravada, S10/Jimmy, and Astro/Safari, the PCM is located in the engine compartment, typically on the passenger (RH) side inner fender or near the battery. On Express/Savana vans, it’s often in the LH rear of the engine compartment.
- ✔ Disconnect the Connectors: Carefully unclip and remove the electrical wiring harnesses from the old PCM. These connectors have locking tabs that must be released before they can be unplugged. Do not force them.
- ✔ Remove the Old Module: Unbolt the old PCM from its mounting bracket. Keep the mounting hardware, as you will need it for the new module.
- ✔ Install the New Module: Mount your new, pre-programmed PCM onto the bracket and secure it with the original hardware.
- ✔ Reconnect Everything: Plug the wiring harnesses firmly into the new module until they click into place. Reconnect the negative battery terminal.
- ✔ Final Steps: The vehicle is now ready to start. In some cases, a security relearn procedure may be required, which typically involves cycling the key. Please refer to your vehicle’s service information for specific steps if needed.
Verified Vehicle Compatibility
This module is a direct replacement for part numbers 16263494, 16265035, 8162634940, 218-11787, and 21811787. It is guaranteed to fit a wide range of GM models. Please verify your vehicle is on this list and, if noted, that the ID number on your current module matches.
BLAZER S10/JIMMY S15 98-00 Electronic Control Module; (RH front engine compartment)
S10/S15/SONOMA 98-00 Electronic Control Module; (RH front engine compartment), 4.3L
ASTRO 99-01 Electronic Control Module; (LH front by battery), ID 16263494
CHEVROLET 1500 PICKUP 99 Electronic Control Module; 5.0L or 5.7L, ID 16263494
SILVERADO 1500 PICKUP 99-00 Electronic Control Module; (LH front under battery), 6 cylinder
TAHOE 99-00 Electronic Control Module; gasoline (LH front engine compartment)
EXPRESS/SAVANA VANS 99-02 Electronic Control Module; gasoline, various IDs
…and many other models listed in the compatibility chart.
Frequently Asked Questions
Frequently Asked Questions
How do I provide my VIN for programming?
After you complete your purchase, simply send us a message with your vehicle’s 17-digit VIN. We cannot ship your order until we receive this information, as it’s required for the programming service.
Is any additional programming needed after installation?
No. This 1998-2000 Bravada PCM arrives fully programmed to your VIN and is ready to install. In some cases, a simple “security relearn” or “CASE relearn” may be necessary, which can often be done without special tools. We recommend checking your vehicle’s service manual for these easy procedures.
What does “programmed with the newest updates” mean?
Over the life of a vehicle, manufacturers like GM release software updates to fix bugs, improve transmission shifting, or enhance engine performance. We flash your module with the latest software available for your specific VIN, ensuring you get all these improvements.
Will this fix my specific problem?
While this module is the correct fix for a failed PCM, we always recommend a proper diagnosis by a qualified mechanic. If your vehicle has symptoms like a no-start or poor running, ensure other components like the fuel pump, ignition system, and sensors have been checked.
Is this part difficult to install myself?
For most DIYers with basic tools, this is a very manageable job. It typically involves disconnecting the battery, unplugging a few connectors, and removing a few bolts. Our installation guide above provides the general steps.