Restore Peak Performance to Your GM Truck or SUV
Is your 1998 Oldsmobile Bravada, Chevy S10, or GMC Jimmy suddenly stalling, shifting erratically, or refusing to start? Before you spend a fortune at the dealership, the problem is very likely a failing Powertrain Control Module (PCM). As a technician with over two decades of experience, I’ve seen these exact issues countless times on these otherwise reliable GM vehicles. The PCM is the brain of your engine and transmission, and when it fails, it can cause a host of frustrating and hard-to-diagnose problems. This isn’t just a replacement part; it’s a direct solution to get your vehicle running right again.
We offer a genuine, used GM PCM that has been rigorously tested and is ready for installation. The critical difference is our service: we flash this computer with the latest official GM software, specifically programmed to your vehicle’s VIN. This ensures perfect compatibility and function, eliminating the need for an expensive trip to the dealer for programming. This is the most efficient and cost-effective way to solve complex electronic issues and restore the reliability you depend on.
A Technician’s Notebook: The Intermittent No-Start Mystery
A customer brought in a ’98 GMC Jimmy 4.3L—a vehicle that shares this exact PCM—with a problem that was driving him crazy. It would start and run perfectly for weeks, then suddenly refuse to start. No crank, no click, nothing. After an hour, it would fire right up as if nothing happened. He’d already replaced the battery and starter. After checking all the wiring, I suspected the PCM. On these models, a failing processor can intermittently lose the security signal or fail to activate the fuel pump relay. We swapped in one of our pre-programmed PCMs, and the problem was solved instantly. It’s a classic case where the PCM itself is the culprit behind a seemingly random electrical ghost.
Is Your Bravada or GM Truck Showing These Signs?
A failing PCM can manifest in many ways. If you’re experiencing any of the following, a faulty computer is a highly likely cause:
- ✔ Check Engine Light is on with codes like P0601 (Internal Control Module Memory Check Sum Error) or P0605 (Internal Control Module Read Only Memory (ROM) Error).
- ✔ Vehicle refuses to start or starts intermittently.
- ✔ Rough or unstable idle.
- ✔ Poor fuel economy for no apparent reason.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Engine stalling while driving or when coming to a stop.
- ✔ Failure to pass an emissions test.
A Straightforward Guide to Installation
Replacing the PCM on these vehicles is a job most DIYers can handle in under 30 minutes with basic hand tools. Our pre-programming makes it even simpler.
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the PCM: On most of these trucks and SUVs (like the Bravada, Jimmy, and S10), the PCM is located in the engine bay, often on the passenger side fender wall or near the battery.
- Disconnect the Connectors: Carefully unclip the wiring harness connectors from the old PCM. They have locking tabs that need to be released.
- Remove the Old Module: Unbolt the PCM from its mounting bracket and remove it from the vehicle.
- Install the New Module: Bolt your new, pre-programmed PCM into the bracket and securely reconnect the wiring harnesses. Ensure they click into place.
- Reconnect the Battery: Reattach the negative battery terminal.
- Perform Security Relearn (If Necessary): Some vehicles may require a simple security relearn. Turn the key to the ‘ON’ position for 10-15 minutes, then turn it off, and then start the vehicle. This allows the systems to sync.
Verified Vehicle Compatibility
This module is a direct replacement for units with part numbers 09355699, 16266645, 16250279, 16258815, or 09366810. It is guaranteed to fit the following vehicles with the specified options:
- Oldsmobile Bravada: 1998 (4.3L, w/o build date opt ZN4)
- GMC Envoy: 1998 (w/o build date opt ZN4)
- Chevrolet Blazer / GMC Jimmy S15: 1998 (w/o build date opt ZN4)
- Chevrolet S10 / GMC Sonoma: 1998 (4.3L, w/o build date opt ZN4)
- Isuzu Hombre: 1998 (4.3L, w/o extended build date opt ZN4)
- Chevrolet Astro / GMC Safari: 1998
- Cadillac Escalade: 1999
- Chevrolet & GMC 1500/2500/3500 Pickups: 1998-1999 (Gasoline Engines)
- Chevrolet Suburban & GMC Yukon: 1998-1999 (Gasoline Engines)
- Chevrolet Tahoe: 1998-1999 (Gasoline Engines)
- Chevrolet Express & GMC Savana 1500/2500/3500 Vans: 1998-1999 (Gasoline Engines)
Frequently Asked Questions
What do you mean by ‘programmed to my VIN’?
Before we ship the PCM, our technicians use specialized equipment to load it with the specific factory software for your vehicle using its unique 17-digit Vehicle Identification Number (VIN). This ensures it works correctly with your engine, transmission, and options, just like a part from the dealer.
Is this a used part?
Yes, this is a high-quality, tested component sourced from a salvaged vehicle. Each unit is inspected and verified to be fully functional before being programmed and shipped. This provides a reliable, cost-effective alternative to a new module.
How do I provide my VIN?
After you complete your purchase, you will receive instructions on how to send us your vehicle’s VIN. We cannot ship your order until we receive this information, as the programming is a required step.
Will I need to do anything else after I install it?
In most cases, the module is plug-and-play. However, some GM vehicles of this era may require a simple security relearn procedure, which involves leaving the key in the ‘ON’ position for about 10-15 minutes. This does not require any special tools.
How do I know if this part number is correct for my truck?
The best way is to check the part number on your existing PCM. This module replaces several part numbers, including 09355699, 16266645, and 9366810. You can also use our compatibility list or contact us with your VIN to confirm fitment.