Restore Your Vehicle’s Brain and Get Back on the Road
If you’re dealing with frustrating, hard-to-diagnose issues on your 1998 Oldsmobile Bravada or another compatible GM vehicle, the Powertrain Control Module (PCM) is often the culprit. As a technician with over two decades of experience, I’ve seen firsthand how a failing PCM can cause a cascade of problems that seem unrelated, from a stubborn no-start condition to poor fuel mileage and erratic engine behavior. This isn’t just a part; it’s the central computer responsible for engine performance, transmission shifting, and fuel delivery. When it fails, your vehicle simply can’t operate as it should.
We take the guesswork and hassle out of the repair. This replacement PCM, compatible with part numbers 09355699, 16250279, and 09366810, is delivered to you fully programmed with the latest GM software updates. All we need is your vehicle’s VIN. This critical step ensures that the module communicates perfectly with your specific vehicle’s systems, eliminating the need for an expensive trip to the dealership for programming. You get a reliable, plug-and-play solution that restores factory performance and drivability.
From the Diagnostic Bay
I remember a 1998 GMC Jimmy with the 4.3L V6 that came into the shop with a classic intermittent no-start. The owner had replaced the battery, starter, and fuel pump, but the problem persisted, especially on hot days. After connecting my scan tool, I found it couldn’t communicate with the PCM. That’s a huge red flag. We let the vehicle cool down, and it started right up. By applying a little heat from a heat gun directly to the PCM case, we replicated the failure instantly. The internal circuits were failing when they got warm. Replacing the faulty module with a properly programmed 1998 Bravada PCM (which shares the same architecture) solved the problem for good. It’s a common failure point on these otherwise tough vehicles.
Is Your GM Truck or SUV Showing These Symptoms?
A failing PCM can manifest in many ways. If you’re experiencing any of the following, it’s a strong indicator that your module needs attention:
- ✔ Check Engine Light is on with internal module codes (e.g., P0601, P0602, P0605)
- ✔ Engine stalls intermittently or won’t start at all
- ✔ No communication between the scan tool and the PCM
- ✔ Harsh or erratic automatic transmission shifting
- ✔ A noticeable drop in fuel economy
- ✔ Misfires or rough idling even after replacing plugs and wires
- ✔ Issues that appear or worsen as the engine warms up
A Straightforward Guide to Installation
Installing your new PCM is a job most DIYers can handle in under an hour. Our pre-programming service makes it a direct swap.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the Old PCM: On most of these GM trucks and SUVs, the PCM is located in the engine compartment. On S-10/Blazer/Jimmy platforms, it’s typically on the RH (passenger) side fender wall. On full-size trucks and vans, it’s usually on the LH (driver) side.
- Disconnect the Connectors: Carefully unclip the wiring harness connectors from the old module. These connectors have locking tabs that need to be released. Avoid pulling on the wires themselves.
- Remove the Module: Unbolt the old PCM from its mounting bracket and remove it from the vehicle.
- Install the New PCM: Mount your new, pre-programmed PCM into the bracket and securely re-attach the wiring harness connectors. You should hear a ‘click’ as they lock into place.
- Reconnect the Battery: Re-attach the negative battery terminal.
- Perform Security Relearn (If Needed): In some cases, you may need to perform a simple security relearn procedure. 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.
Verified Vehicle Compatibility
This module is a direct-fit replacement for a wide range of GM vehicles. Please verify your original part number or match your vehicle from the list below. The ID number is critical for a correct match.
ASTRO/SAFARI (98-99): 4.3L, Located by battery
BLAZER/JIMMY/ENVOY (98): 4.3L, RH front engine compartment, w/o build date opt ZN4
BRAVADA (98): 4.3L, w/o build date opt ZN4
CHEVROLET/GMC PICKUPS (C/K 1500/2500/3500) (98-99): Gasoline, LH engine compartment
ESCALADE (99): LH front engine compartment
EXPRESS/SAVANA VANS (1500/2500/3500) (98): Gasoline models
ISUZU HOMBRE (98): 4.3L, w/o extended build date opt ZN4
S10/SONOMA (98): 4.3L, w/o build date opt ZN4
SUBURBAN (1500/2500) (98-99): Gasoline, LH engine compartment
TAHOE/YUKON (98-99): Gasoline, LH engine compartment
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) is essential for us to program the PCM with the correct software for your specific engine, transmission, and vehicle options. This ensures seamless communication and proper function, just like the original module from the factory.
Is any other programming required after installation?
No, this module arrives ready to install. The only potential step is a simple security relearn procedure (often called a ‘key cycle’), which takes about 30 minutes and requires no special tools. Instructions are readily available online for your specific model.
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 visually inspect the module in your vehicle to confirm the number matches one of the compatible IDs listed (e.g., 16250279).
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the PCM (common codes like P0601-P0606), then yes, this part will resolve the issue. However, you should always diagnose and fix any other fault codes (e.g., for sensors or solenoids) before replacing the PCM.
Is this a used part?
This is a high-quality, inspected, and tested replacement part that has been programmed with the latest software for your vehicle. It is guaranteed to restore your vehicle’s functionality.