Restore Peak Performance to Your GM Vehicle
If you’re dealing with frustrating issues like a persistent Check Engine Light, erratic engine behavior, or poor fuel economy in your 1998 Buick Riviera or other compatible GM model, a failing Powertrain Control Module (PCM) is often the culprit. As the central computer of your vehicle, the PCM controls everything from fuel mixture and ignition timing to transmission shifting. When it fails, the symptoms can be widespread and confusing. This replacement PCM, part number 9356741, is the reliable, straightforward solution to get your car running smoothly again.
With over two decades of hands-on diagnostic experience, I’ve seen firsthand how a faulty PCM can sideline an otherwise solid vehicle. This isn’t just a part; it’s a solution that restores your vehicle’s core functionality. We take the guesswork and hassle out of the repair by programming this module specifically for your car using your Vehicle Identification Number (VIN). This ensures it arrives with the latest GM software updates, ready for a simple, direct installation. No expensive trips to the dealership for programming are required.
From the Diagnostic Bay: The Ghost in the Transmission
A customer brought in a ’98 LeSabre a while back with a complaint of harsh, unpredictable shifting and a transmission that seemed to hunt for gears. They had already replaced the transmission fluid and filter, but the problem persisted. My initial scan showed no specific transmission codes, which was odd. However, when I dug into the PCM data, I noticed intermittent communication dropouts. The PCM wasn’t properly commanding the transmission solenoids. We swapped in a correctly programmed PCM, and the shifting issues vanished instantly. It’s a classic case I’ve seen dozens of times: what looks like a major transmission problem is actually a failing 1998 Riviera Powertrain Control Module or its equivalent in another GM model.
Common Signs of a Failing PCM
A faulty PCM can manifest in many ways. If your vehicle is experiencing any of the following, it might be time for a replacement:
- âś” Persistent Check Engine Light (CEL) with codes like P0601, P0605, or other communication errors.
- âś” Engine stalling, misfiring, or running rough.
- âś” Unexplained drop in fuel efficiency.
- âś” Harsh or erratic automatic transmission shifting.
- âś” Failure to start, even with a good battery and starter.
- âś” Inconsistent performance that comes and goes with temperature changes.
A Straightforward Guide to Installation
Installing your new PCM is a manageable job for a DIYer with basic tools. This pre-programmed module makes the process much simpler.
- 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 under the dash on the passenger side or in the engine compartment. Consult a repair manual for your specific vehicle if you’re unsure.
- Disconnect the Old Module: Carefully unplug the electrical harness connectors. They have locking tabs that need to be released. Be gentle to avoid damaging the pins or clips.
- Remove the Old PCM: Unbolt the module from its mounting bracket and remove it from the vehicle.
- Install the New PCM: Mount your new, pre-programmed module in place and securely tighten the bolts.
- Reconnect Everything: Plug the electrical connectors firmly into the new PCM until they click into place. Reconnect the negative battery terminal.
- Perform Security Relearn (If Necessary): Some GM vehicles require a simple key-cycle security relearn procedure. This typically involves turning the key to the ‘ON’ position for 10-15 minutes. Instructions will be provided if required for your vehicle.
Verified Vehicle Compatibility
This module is a direct-fit replacement for a wide range of GM vehicles. Please verify your part number or message us with your VIN to confirm compatibility. This part is a confirmed match for the following applications:
ALERO 99 (3.4L, ID 16236757, 9356741, 9357034, 9357440)
BONNEVILLE 98
CAMARO 98 (6-231, 3.8L)
CENTURY 98 (6-191, 3.1L)
CUTLASS 98 & 99 (ID 16236757)
EIGHTY EIGHT 98
FIREBIRD 98 (6-231, 3.8L)
GRAND AM 98 (3.1L) & 99 (3.4L, various IDs)
GRAND PRIX 98
INTRIGUE 98
LESABRE 98 (6-231, 3.8L)
LUMINA CAR 98
MALIBU 98 (6-191, 3.1L)
MONTE CARLO 98
PARK AVENUE 98 (6-231, 3.8L)
REGAL 98
RIVIERA 98 (6-231, 3.8L)
SILHOUETTE 98
SKYLARK 98 (6-191, 3.1L)
TRANS SPORT 98
VENTURE 98 (6-207, 3.4L)
This part replaces service numbers: 09356741, 16236757, 9357034, 9357440, 9366314.
Frequently Asked Questions
Why do you need my VIN?
Your VIN (Vehicle Identification Number) is essential for us to program the PCM with the correct factory software for your car’s specific engine, transmission, and options. This ensures perfect compatibility and function right out of the box.
Is this a plug-and-play part?
Yes, for most vehicles, it is. Because we pre-program it to your VIN, you can typically install it and start the car. Some models may require a simple security relearn procedure, which involves a few key cycles and does not require any special tools.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the PCM (e.g., DTC P0601), then yes, this part will resolve the issue. However, you should always diagnose the codes to ensure the problem isn’t a faulty sensor or wiring elsewhere in the vehicle.
How do I find my original part number?
The part number is printed on a sticker on your original PCM. You can cross-reference it with the compatible service numbers listed above. If you can’t find it, just send us your VIN, and we can verify the correct part for you.