Restore Peak Performance to Your GM Vehicle
Is your 1998-1999 Oldsmobile Cutlass, Pontiac Grand Am, or other GM vehicle suffering from frustrating issues like a persistent check engine light, erratic shifting, poor fuel economy, or even a no-start condition? These are classic signs of a failing Powertrain Control Module (PCM), the electronic brain of your engine and transmission. Don’t let a faulty computer keep you off the road. This replacement PCM is the reliable, straightforward solution to get your vehicle running smoothly again.
We take the guesswork and hassle out of the repair. Unlike sourcing a part from a salvage yard, this module comes professionally programmed to your vehicle’s specific Vehicle Identification Number (VIN). We load the latest, most stable software updates directly from GM, ensuring optimal performance, fuel efficiency, and emissions control. This critical step means no expensive trip to the dealership for programming—it arrives ready for installation.
Case Study: A Tricky Diagnosis
I remember a 1998 Pontiac Grand Prix that came into the shop with an intermittent stalling problem that was driving the owner crazy. It would die at stoplights, but not always, and it never stored a clear trouble code pointing to one sensor. We checked fuel pressure, ignition components, and sensor data, but everything looked fine. After hours of diagnostics, I noticed the 5-volt reference signal to the throttle position sensor would briefly drop out right before a stall. Tracing it back, the issue wasn’t the sensor or the wiring—it was an internal failure in the PCM itself. Replacing the PCM, just like this one, solved the problem completely. It’s a reminder that the PCM can cause some of the most elusive drivability issues.
Common Signs of a Failing PCM
- ✔ Check Engine Light is on with codes like P0601, P0602, or P0606 (Internal Module Failure).
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained drops in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Intermittent stalling or rough idling.
- ✔ Failure to pass an emissions/smog test.
Your Straightforward PCM Installation Guide
Installing your new 1998-1999 Cutlass Powertrain Control Module is a job most DIYers can handle in their own driveway. While the exact location varies by model (often in the engine bay or under the dash), the process is generally the same.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the PCM: Find the existing module on your vehicle. It’s a metal box with several large electrical connectors. On many of these models, it’s located under the left-hand side of the dash or in the engine compartment.
- Disconnect and Remove: Carefully unplug the wiring harnesses. They have locking tabs that need to be released. Once unplugged, unbolt the module from its mounting bracket and remove it.
- Install the New Module: Bolt the new, programmed PCM into place. Securely plug in the wiring harnesses, making sure you hear a ‘click’ as they lock.
- Reconnect Power: Reattach the negative battery terminal.
- Perform Security Relearn (If Needed): Some GM vehicles of this era require a simple key-cycle security relearn procedure to sync the new PCM with the anti-theft system. This typically involves turning the key to ‘ON’ for 10 minutes, ‘OFF’ for 10 seconds, and repeating three times.
Verified Vehicle Compatibility
This module is a direct-fit replacement for units with service numbers 09356741, 16236757, 9357034, 9357440, or 9366314. It is guaranteed to fit the following vehicles:
- ACHIEVA 1998 (6-191, 3.1L)
- ALERO 1999 (3.4L, with matching ID)
- BONNEVILLE 1998
- CAMARO 1998 (6-231, 3.8L)
- CENTURY 1998 (6-191, 3.1L)
- CUTLASS 1998-1999
- EIGHTY EIGHT 1998
- FIREBIRD 1998 (6-231, 3.8L)
- GRAND AM 1998-1999 (3.1L or 3.4L, check ID for ’99)
- GRAND PRIX 1998
- INTRIGUE 1998
- LESABRE 1998 (6-231, 3.8L)
- LUMINA CAR 1998
- MALIBU 1998 (6-191, 3.1L)
- MONTE CARLO 1998
- PARK AVENUE 1998 (6-231, 3.8L)
- REGAL 1998
- RIVIERA 1998 (6-231, 3.8L)
- SILHOUETTE 1998
- SKYLARK 1998 (6-191, 3.1L)
- TRANS SPORT 1998
- VENTURE 1998 (6-207, 3.4L)
What does ‘VIN Programmed’ actually mean?
What does ‘VIN Programmed’ actually mean?
It means we load your car’s specific Vehicle Identification Number (VIN) and the latest GM-approved software onto the module before we ship it. This ensures the PCM communicates perfectly with your car’s engine, transmission, and security system, just like the original part did from the factory.
Do I need any special tools for installation?
No special tools are required. Basic hand tools like a socket set and screwdriver are all you should need to access and replace the module. The most important part of the process is our pre-programming, which saves you from needing expensive dealership diagnostic equipment.
How do I provide my VIN after purchase?
After you complete your purchase, simply send us a message with your 17-digit VIN. We cannot program and ship the module without it. You can find your VIN on your vehicle’s registration, insurance card, or on the driver’s side dashboard near the windshield.
Will this fix my check engine light?
If the check engine light is on due to an internal PCM failure (like codes P0601-P0606) or a fault the PCM is causing, then yes, this will resolve the issue. However, if the light is on for another reason, such as a bad oxygen sensor or a loose gas cap, you will still need to fix that separate problem.
My old part has a different number on it. Will this still work?
Yes. GM uses many different service numbers for the same compatible part. This module, part number 9366314, is a direct replacement for all the service numbers listed in the description, including 09356741, 16236757, and others. As long as your vehicle is on the compatibility list, this part will work correctly.