Restore Peak Performance to Your GM Vehicle
If you’re dealing with a frustrating check engine light, erratic engine behavior, or a no-start condition in your 1998-1999 Pontiac Grand Am, a failing Powertrain Control Module (PCM) is often the culprit. As the ‘brain’ of your vehicle’s engine and transmission, a faulty PCM can cause a cascade of problems that are difficult to diagnose. I’ve spent years in the bay tracing phantom electrical issues back to these modules. This isn’t just a replacement part; it’s a reliable, long-term solution designed to restore your vehicle’s original performance and efficiency.
This PCM arrives at your door fully programmed with the latest GM software updates, tailored specifically to your vehicle’s Vehicle Identification Number (VIN). This crucial step eliminates the need for expensive dealership programming or specialized scan tools, making it a true plug-and-play fix for both seasoned mechanics and first-time DIYers. By providing us with your VIN at checkout, you ensure that the module communicates flawlessly with your car’s systems, just as the original did. Get your car back on the road with confidence, knowing you’ve installed a dependable, correctly configured 1998-1999 Grand Am PCM.
A Technician’s Notebook
I recall a ’99 Alero with the 3.4L V6 that came into the shop with a complaint of intermittent stalling at stoplights and hard, unpredictable shifts. The owner had already replaced the throttle position sensor and the idle air control valve with no luck. The scanner showed no hard codes, just a history of random communication faults. After checking the main power and ground circuits to the PCM, we swapped in a pre-programmed module. The difference was immediate. The idle smoothed out, the transmission shifted perfectly, and the stalling issue was gone for good. It’s a classic case where the internal logic of the module begins to fail, causing symptoms that can lead you down a rabbit hole of unnecessary parts replacement.
Is Your GM Vehicle Showing These Symptoms?
A failing PCM can manifest in various ways. If you’re experiencing any of the following, this module is the likely solution.
- ✔ Persistent Check Engine Light (CEL)
- ✔ Diagnostic Trouble Codes (DTCs) related to internal module failure, such as P0601, P0602, or P0605
- ✔ Unexplained drop in fuel economy
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Engine stalling, stumbling, or refusing to start
- ✔ Communication errors with diagnostic scan tools
- ✔ Failure to pass state emissions testing
A Straightforward Guide to Installation
Installing your new 1998-1999 Grand Am PCM is a manageable job for most DIYers. Follow these steps for a smooth installation process. Always consult a vehicle-specific service manual if you are unsure about any step.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental reconnection.
- Locate the PCM: On most of these vehicles, the PCM is located inside the passenger compartment, on the left-hand (driver’s) side of the center dash, or in the engine bay. Check your service manual for the exact location.
- Disconnect the Connectors: Carefully release the locking tabs on the electrical wiring harnesses and disconnect them from the old module. Avoid pulling on the wires themselves.
- 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 onto the bracket and secure the bolts.
- Reconnect Everything: Firmly plug the wiring harnesses into the new module 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 included if required for your vehicle.
Verified Vehicle Compatibility
This module, corresponding to part number 9356741 and service numbers 09356741, 16236757, 9357034, 9357440, and 9366314, is a direct-fit replacement for a wide range of GM vehicles. Please verify your part number and application from the list below to ensure proper fitment.
ALERO 99 Electronic Control Module; (LH center dash), 3.4L, ID 16236757, 9356741, 9357034, 9357440, 9366314
BONNEVILLE 98 Electronic Control Module
CAMARO 98 Electronic Control Module; 6-231 (3.8L)
CENTURY 98 Electronic Control Module; (6-191, 3.1L)
CUTLASS 98 Electronic Control Module
CUTLASS 99 Electronic Control Module; (LH center dash), ID 16236757
EIGHTY EIGHT 98 Electronic Control Module
FIREBIRD 98 Electronic Control Module; 6-231 (3.8L)
GRAND AM 98 Electronic Control Module; 6-191 (3.1L)
GRAND AM 99 Electronic Control Module; (LH center dash), 3.4L, ID 16236757, 9356741, 9357034, 9347440, 9366314
GRAND PRIX 98 Electronic Control Module
INTRIGUE 98 Electronic Control Module
LESABRE 98 Electronic Control Module; (6-231, 3.8L)
LUMINA CAR 98 Electronic Control Module; (LH engine compartment)
MALIBU 98 Electronic Control Module; 6-191 (3.1L)
MONTE CARLO 98 Electronic Control Module
PARK AVENUE 98 Electronic Control Module; (6-231, 3.8L)
REGAL 98 Electronic Control Module
RIVIERA 98 Electronic Control Module; (6-231, 3.8L)
SILHOUETTE 98 Electronic Control Module; (LH engine compartment)
SKYLARK 98 Electronic Control Module; 6-191 (3.1L)
TRANS SPORT 98 Electronic Control Module; (LH engine compartment)
VENTURE 98 Electronic Control Module; (6-207, 3.4L)
Frequently Asked Questions about this 1998-1999 Grand Am PCM
Do I need to have this module programmed?
Do I need to have this module programmed?
No. This module comes fully programmed to your vehicle’s specific VIN before it ships. It is ready for installation right out of the box, saving you a trip to the dealership.
Where do I provide my VIN?
After you complete your purchase, you will need to send us your 17-digit VIN. We cannot program and ship the module without it. Please double-check it for accuracy to avoid delays.
How do I find my old part number to confirm a match?
The part number is printed on a sticker on your original PCM. You can match it to the part number 9356741 or any of the compatible service numbers listed in the description.
Will this fix my car’s specific problem?
This PCM is a direct solution for failures within the module itself, which cause a wide range of symptoms from no-start conditions to poor fuel economy. While it solves many common issues, we always recommend a proper diagnosis to confirm the PCM is the point of failure before ordering.
Is any other setup required after installation?
In most cases, no. However, some GM vehicles may require a simple security relearn procedure, which involves a series of key cycles. If this is necessary for your vehicle, easy-to-follow instructions will be included with your part.