Restore Your Truck’s Brain and Get Back on the Road
Is your 1998 Oldsmobile Bravada or other GM truck giving you headaches? Unexplained stalling, a persistent check engine light, or a complete no-start condition can often be traced back to a single, critical component: the Powertrain Control Module (PCM). As the central computer of your vehicle, when the PCM fails, it can create a cascade of frustrating and hard-to-diagnose issues. This isn’t just an inconvenience; it’s a reliability problem that can leave you stranded. This thoroughly tested, used PCM is the dependable and affordable solution to get your vehicle running smoothly again.
We take the biggest hassle out of the repair process. Each module is professionally programmed with the latest GM software updates specifically for your vehicle using the VIN you provide. This means you receive a part that is ready for installation right out of the box, saving you a costly trip to the dealership and hundreds of dollars in programming fees. This is the smart, straightforward fix for a wide range of drivability problems plaguing these otherwise robust GM trucks and SUVs.
From the Diagnostic Bay
I remember a 1998 GMC Jimmy S15 that came into my shop on a tow truck. The owner had replaced the battery, alternator, and even the fuel pump, but it still wouldn’t start consistently. It had no spark and the fuel injectors weren’t firing. When I connected my scan tool, it couldn’t communicate with the PCM—a dead giveaway. These older PCMs, especially the ones mounted in the engine bay like on the S-series platform, are constantly exposed to heat and vibration. Over 20+ years, internal solder joints crack and components fail. We swapped in a VIN-programmed PCM just like this one, and the truck fired up on the first crank. It’s a common failure I’ve seen dozens of times.
Is Your Vehicle Showing These Signs of a Bad PCM?
- ✔ Check Engine Light is on with no clear cause.
- ✔ Engine cranks but refuses to start.
- ✔ Vehicle stalls intermittently while driving or at idle.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Your scan tool cannot communicate with the computer.
- ✔ Stored diagnostic trouble codes (DTCs) such as P0601, P0605, or other U-series communication codes.
A Straightforward Guide to Installation
- ✔ Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any work on the electrical system.
- ✔ Locate the PCM: On the 1998 Bravada and similar S-series trucks (Blazer, Jimmy, S10), the PCM is typically located in the engine compartment, often on the passenger side near the firewall or inner fender.
- ✔ Disconnect Connectors: Carefully unclip the wiring harness connectors from the old PCM. These connectors have locking tabs that need to be released before they can be pulled away. Avoid pulling on the wires themselves.
- ✔ Remove the Old Module: Unbolt the PCM from its mounting bracket. It’s usually held in by a few small bolts.
- ✔ Install the New Module: Mount your new, pre-programmed PCM in place and securely fasten the bolts.
- ✔ Reconnect Everything: Plug the wiring harness connectors firmly into the new module until they click into place. Reconnect the negative battery terminal.
- ✔ Security Relearn (If Needed): While not always required, some GM vehicles may need a security or CASE (Crankshaft Angle Sensor Error) relearn procedure after PCM replacement. This can often be done without special tools and instructions are widely available online for your specific model.
Verified Vehicle Compatibility
This PCM, identified by service number 09366810 or ID 9355699, is a direct-fit replacement for a wide array of GM vehicles. Please verify your original part number or use the compatibility list below. It is crucial to match the ID number 9355699 for proper function.
ASTRO 98
BLAZER S10/JIMMY S15 98
BRAVADA 98 (4.3L V6)
ENVOY 98
ESCALADE 99
CHEVROLET/GMC 1500/2500/3500 PICKUP 98-99 (Gasoline)
EXPRESS/SAVANA 1500/2500/3500 VAN 98-99 (Gasoline)
ISUZU HOMBRE 98 (4.3L V6)
S10/S15/SONOMA 98 (4.3L V6)
SAFARI (GMC) 98
SUBURBAN 1500/2500 98-99 (Gasoline)
TAHOE/YUKON 98-99 (Gasoline)
Note: Some 1998 models have specific build date options (w/o ZN4). This module fits vehicles without the extended build date option.
Frequently Asked Questions
Why do you need my VIN?
Why do you need my VIN?
We require your Vehicle Identification Number (VIN) to program the PCM with the exact software and calibrations for your specific vehicle. This ensures perfect compatibility with your engine, transmission, and options, making the installation process plug-and-play.
Is this a new part?
This is a high-quality, used OEM part that has been sourced from a salvaged vehicle. Each unit is rigorously tested for full functionality before being programmed and shipped, offering a reliable and cost-effective alternative to a new module.
Will I need to do anything after installing it?
In many cases, the vehicle will start and run correctly immediately. However, some GM vehicles of this era may require a simple security relearn or a Crankshaft Variation (CASE) relearn procedure to clear certain codes and optimize performance. This can typically be done without a professional scan tool.
How do I find my original part number?
The part number is printed on a sticker on the case of your current PCM. You will need to locate and remove the module to view it. The most important number to match for this generation of GM vehicles is the Service ID, which is 9355699.
Is this guaranteed to fix my vehicle’s problem?
This PCM will correct any issues directly caused by a faulty computer. If your vehicle has been properly diagnosed with a failed PCM, this part is the solution. However, it will not fix problems related to other bad sensors, wiring, or mechanical components.