Restore Peak Performance to Your GM Vehicle
Is your 1998-1999 Oldsmobile Cutlass, Pontiac Grand Am, or another trusted GM vehicle suddenly giving you headaches? If you’re dealing with a persistent Check Engine Light, erratic engine behavior, stalling, or poor fuel economy, the culprit is often a failing Powertrain Control Module (PCM). As the ‘brain’ of your vehicle, the PCM controls everything from fuel mixture and ignition timing to transmission shifting. When it falters, the entire driving experience suffers. This isn’t just an annoyance; it can be a safety issue and lead to failed emissions tests.
This is a direct-fit replacement PCM, service number 9357034, designed to restore your vehicle’s factory performance and reliability. The biggest hurdle with PCM replacement has always been the expensive and time-consuming programming required at a dealership. We eliminate that step entirely. By providing us with your vehicle’s VIN at checkout, we will program the module with the latest official GM software updates specific to your car. It arrives at your door ready for installation, saving you time, money, and a trip to the service center.
From the Diagnostic Bay
I remember a 1998 Buick LeSabre that came into my shop with a frustratingly intermittent stalling problem. The owner had already replaced the fuel pump and ignition coils with no luck. The car would run fine for days, then die at a stoplight without warning. No specific codes were stored, just a generic P0601 (Internal Control Module Memory Check Sum Error) that would pop up occasionally. After checking all the wiring and grounds, we hooked up a scope to the PCM outputs. We saw the injector and ignition signals just drop out randomly. It was a classic case of an internally failing 1998-1999 Cutlass Powertrain Control Module (the same family of PCM). We installed a VIN-programmed unit like this one, performed the crankshaft position sensor relearn, and the car ran perfectly. The owner was thrilled to have his reliable car back.
Common Signs of a Failing GM PCM
- ✔ Check Engine Light is on with codes like P0601, P0602, P0605, or other communication errors.
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained stalling or rough idling, especially when warm.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Failure to pass state emissions testing.
- ✔ Intermittent loss of power or hesitation during acceleration.
A Straightforward Guide to Your PCM Swap
- ✔ Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- ✔ Locate the PCM: On most of these GM models, the PCM is located either in the engine bay (often inside the air filter box) or under the dash on the passenger or driver’s side. Consult a vehicle-specific guide if you’re unsure.
- ✔ Disconnect Connectors: Carefully unclip the wiring harness connectors from the old module. These connectors have locking tabs; be gentle to avoid breaking them.
- ✔ Remove the Old Module: Unbolt the old PCM from its mounting bracket and remove it from the vehicle.
- ✔ Install the New Module: Mount your new, pre-programmed PCM securely in place. Reconnect the wiring harnesses, ensuring they click firmly into place.
- ✔ Reconnect Battery: Reattach the negative battery terminal.
- ✔ Perform Security/CASE Relearn: After installation, a security relearn procedure and/or a Crankshaft Position (CASE) relearn may be necessary. This can often be done without special tools (e.g., turning the key to ‘ON’ for 10-15 minutes) or with a capable scan tool. This step is crucial for proper engine operation.
Verified Vehicle Compatibility List
This module is a direct replacement for service numbers 09356741, 16236757, 9356741, 9357034, 9357440, and 9366314. It is confirmed to fit the following vehicles:
- Oldsmobile Alero: 1999 (3.4L)
- Oldsmobile Achieva: 1998 (3.1L)
- Oldsmobile Cutlass: 1998-1999
- Oldsmobile Eighty Eight: 1998
- Oldsmobile Intrigue: 1998
- Oldsmobile Silhouette: 1998
- Buick Century: 1998 (3.1L)
- Buick LeSabre: 1998 (3.8L)
- Buick Park Avenue: 1998 (3.8L)
- Buick Regal: 1998
- Buick Riviera: 1998 (3.8L)
- Buick Skylark: 1998 (3.1L)
- Chevrolet Camaro: 1998 (3.8L)
- Chevrolet Lumina Car: 1998
- Chevrolet Malibu: 1998 (3.1L)
- Chevrolet Monte Carlo: 1998
- Chevrolet Venture: 1998 (3.4L)
- Pontiac Bonneville: 1998
- Pontiac Firebird: 1998 (3.8L)
- Pontiac Grand Am: 1998 (3.1L), 1999 (3.4L)
- Pontiac Grand Prix: 1998
- Pontiac Trans Sport: 1998
Purchasing this 1998-1999 Cutlass Powertrain Control Module is the most effective way to solve complex electronic issues and get your car back to the reliable vehicle you depend on.
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to access the exact GM calibration files for your car’s specific engine, transmission, and options. We program the module with this precise software, ensuring it works perfectly out of the box without needing a trip to the dealer.
Is this a plug-and-play part?
Yes, for the most part. Because we pre-program it to your VIN, it eliminates the most difficult step. However, some GM vehicles of this era require a simple security relearn procedure (often called a Passlock or VATS relearn) and/or a CASE relearn after installation, which can typically be done in your driveway.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls the electronic solenoids in the transmission that manage shifting. If your PCM is failing, it can send erratic signals, causing harsh shifts, slipping, or delayed engagement. Replacing a faulty PCM can often resolve these issues.
Is this part difficult to install for a DIYer?
Not at all. For most of the listed vehicles, the PCM is easily accessible. The installation typically involves disconnecting the battery, unplugging a few electrical connectors, and removing a few bolts. It’s a job most DIYers with basic hand tools can complete in under an hour.
What if I have a different service number on my old part?
This module replaces a range of common service numbers, including 09356741, 16236757, 9357440, and others listed above. As long as your vehicle is on the compatibility list, this module is the correct, updated replacement, even if the number on your original part is different.