Restore Your Vehicle’s Core Performance
Is your 1998 Oldsmobile Bravada or other GM truck suffering from baffling issues like a persistent check engine light, erratic shifting, poor fuel economy, or even a no-start condition? The Powertrain Control Module (PCM), the electronic brain of your vehicle, is often the culprit. After 20+ years in the service bay, I’ve seen countless vehicles sidelined by a failing PCM. Heat, vibration, and age can degrade internal components, leading to frustrating and hard-to-diagnose problems. This isn’t just a replacement part; it’s a direct solution to get your trusted truck or SUV running reliably again.
This isn’t a generic, off-the-shelf unit. We take the guesswork and extra expense out of the equation. When you purchase this module, we will flash it with the latest official GM software updates, specifically programmed to your vehicle’s unique Vehicle Identification Number (VIN). This ensures perfect communication between the engine, transmission, and other onboard systems, restoring the smooth operation and efficiency you expect. Forget costly dealership programming fees or the hassle of finding a shop with the right equipment. This 1998 Bravada Powertrain Control Module arrives ready for installation.
A Technician’s Notebook
I remember a 1998 GMC Jimmy with the 4.3L V6 that came into the shop with a complaint of intermittent stalling at stoplights and a weird, delayed shift from first to second gear. The owner had already replaced the throttle position sensor and the mass air flow sensor with no luck. The scanner showed a P0601 (Internal Control Module Memory Check Sum Error) and a U0101 (Lost Communication with TCM). These codes together are a classic sign. The PCM wasn’t just failing—it was taking the transmission controls down with it. We installed a VIN-programmed module just like this one. The difference was immediate. The engine idled smoothly, the transmission shifted crisply, and all communication codes cleared. It’s a fix I’ve performed hundreds of times on these GM platforms.
Common Signs of a Failing PCM
- ✔ Check Engine Light is on with communication-related DTCs (e.g., P0601, P0605, U-series codes).
- ✔ Your vehicle will not start, or it starts and immediately stalls.
- ✔ Noticeable decrease in fuel efficiency for no apparent reason.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Engine misfiring, running rough, or stalling unexpectedly.
- ✔ Seeming failure of multiple unrelated sensors at once.
Your Straightforward Installation Guide
Installing your new 1998 Bravada Powertrain Control Module is a manageable job for a DIYer with basic tools. Follow these steps carefully.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent any accidental reconnection.
- Locate the PCM: On most compatible models like the Bravada, Blazer, and S10/Sonoma, the PCM is located in the engine compartment, typically on the passenger side (RH) near the firewall or inner fender. For full-size trucks and vans, it’s often on the driver’s side (LH) inner fender.
- Disconnect the Connectors: Carefully unclip and remove the electrical wiring harnesses from the old module. These connectors have locking tabs; be gentle to avoid breaking them. There may be several multi-pin connectors.
- Remove the Old Module: Unbolt the PCM from its mounting bracket. It’s usually held in place by a few small bolts or nuts.
- Install the New Module: Mount your new, pre-programmed PCM onto the bracket and secure it. Reconnect the wiring harnesses, ensuring each one clicks firmly into place.
- Reconnect the Battery: Reattach the negative battery terminal.
- Perform Security Relearn (If Necessary): On many GM vehicles of this era, you will need to perform a simple security relearn procedure so the vehicle recognizes the new PCM. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times before starting the engine. Consult your vehicle’s specific procedure if needed.
Verified Vehicle Compatibility
This module is a direct-fit replacement for service numbers 09366810, 16250279, and 09355699. Please verify your part number and check the detailed fitment list below. This part fits a wide range of 1998-1999 GM and Isuzu vehicles, including:
1998-1999: Chevrolet/GMC Suburban, Tahoe, Yukon (Gasoline)
1998-1999: Chevrolet Astro / GMC Safari Van (4.3L)
1998: Chevrolet S10 / GMC Sonoma (4.3L)
1998: Oldsmobile Bravada / GMC Envoy / Chevrolet Blazer / GMC Jimmy (4.3L, w/o build date opt ZN4)
1998: Isuzu Hombre (4.3L, w/o extended build date opt ZN4)
1998: Chevrolet Express / GMC Savana 1500, 2500, 3500 Vans (Gasoline)
1999: Cadillac Escalade
Note: Please match your vehicle’s specific options and the ID number (e.g., 16250279, 16258815) on your original module to ensure compatibility.
Frequently Asked Questions About This PCM
Do I need to do any programming myself?
Do I need to do any programming myself?
No. This is the biggest benefit of our service. We flash the module with the latest GM software using the VIN you provide during checkout. It arrives ready to be installed in your vehicle, saving you a trip to the dealership.
How do I provide my VIN?
After you complete your purchase, you will need to send us your 17-digit Vehicle Identification Number (VIN). We cannot ship your order until we receive this information, as it is essential for the programming process.
Is this compatible with other part numbers?
Yes, this module is a direct replacement for several service numbers, including 16250279, 09366810, and 09355699. If your original module has one of these numbers, this part will work for you.
What is the security relearn procedure?
For many GM vehicles, the anti-theft system (Passlock/VATS) needs to sync with the new PCM. The most common method is the ’10-Minute Relearn.’ After installation, turn the key to ON (don’t start), wait 10-15 minutes until the security light stops flashing, turn the key OFF for 10 seconds, and repeat two more times. The vehicle should then start and run normally.