Restore Your Vehicle’s Brain and Get Back on the Road
Is your 1997 Buick Park Avenue or another classic GM vehicle acting up? Intermittent stalling, a persistent Check Engine Light, or rough performance can be incredibly frustrating. As a mechanic with over two decades of experience, I’ve seen these issues countless times, and they often trace back to one critical component: the Powertrain Control Module (PCM). This isn’t just another part; it’s the central computer that manages everything from fuel injection and spark timing to transmission shifts. When it fails, the symptoms can be unpredictable and difficult to diagnose.
This replacement Powertrain Control Module, part number 19109047, is the definitive solution. We take the guesswork and hassle out of the repair by pre-programming the module to your vehicle’s specific Vehicle Identification Number (VIN). This means it arrives at your door with the latest GM software updates, ready for a straightforward installation. You get a reliable fix that restores factory performance without the need for an expensive trip to the dealership for programming.
A Technician’s Notebook: The Intermittent Stall Mystery
I remember a 1997 Buick Regal with the supercharged 3.8L that came into my shop. The owner was at his wit’s end. The car would run perfectly for days, then suddenly stall at a stoplight and refuse to restart for 10-15 minutes. There were no consistent trouble codes, just a history of random misfires. We checked fuel pressure, ignition components, and sensors—all tested fine. On a hunch, I gently tapped the PCM with a screwdriver handle while the engine was idling. The engine immediately stumbled. The problem was internal to the module; heat and vibration had caused a hairline crack in a circuit board that would separate and break connection intermittently. Replacing the PCM with a properly programmed unit solved the problem for good. This is a classic failure mode for these older modules.
Common Signs of a Failing GM PCM
If the heart of your vehicle’s electronics is failing, you’ll likely notice one or more of these symptoms. A failing module can often store internal fault codes like P0601 or P0605.
- ✔ Unexplained Check Engine Light illumination
- ✔ Engine stalling or shutting off while driving
- ✔ Rough or erratic idling
- ✔ Noticeable decrease in fuel economy
- ✔ Harsh or incorrect transmission shifting
- ✔ Failure to pass an emissions inspection
- ✔ Complete no-start condition where the engine cranks but won’t fire
A Straightforward Guide to Installation
Replacing the PCM is a job most DIYers can handle in their own driveway. Follow these steps for a successful installation of your 1997 Park Avenue PCM.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 10 minutes to ensure the system is fully discharged.
- Locate the Module: On most of these GM vehicles, the PCM is located in the engine bay, typically inside the air filter box housing for protection.
- Disconnect the Harnesses: Carefully unclip and remove the electrical connectors. These connectors have locking tabs, so be gentle and do not force them. Inspect the pins for any corrosion or damage.
- Remove the Old PCM: Unbolt the module from its mounting bracket or housing.
- Install the New PCM: Mount your new, pre-programmed module in place and securely fasten it.
- Reconnect Everything: Firmly plug the electrical harnesses back into the new PCM until they click into place. Reconnect the negative battery terminal.
- Perform a Security Relearn (If Necessary): In some cases, a simple security relearn procedure is needed. This typically involves turning the key to the ‘ON’ position for 10-15 minutes. Consult your vehicle’s service manual for the specific procedure. Your vehicle is now ready to start.
Verified Vehicle Compatibility
This module is a direct-fit replacement for several 1997 GM models. Please confirm your vehicle is on this list. This unit is compatible with original part numbers 16227797 and 19109047.
CAMARO 97 Electronic Control Module; 6-231 (3.8L)
EIGHTY EIGHT 97 Electronic Control Module; (6-231, 3.8L), w/supercharged option
FIREBIRD 97 Electronic Control Module; 6-231 (3.8L)
GRAND PRIX 97 Electronic Control Module; 6-231 (3.8L), w/supercharged option
LUMINA CAR 97 Electronic Control Module; 6-207 (3.4L)
MONTE CARLO 97 Electronic Control Module; 6-207 (3.4L)
PARK AVENUE 97 Electronic Control Module; (6-231, 3.8L)
REGAL 97 Electronic Control Module; (6-231, 3.8L), w/supercharged option
RIVIERA 97 Electronic Control Module; (6-231, 3.8L)
Frequently Asked Questions
Why do you need my VIN?
Your VIN is essential. We use it to load the exact, correct GM-certified software for your vehicle’s specific engine, transmission, and options. This ensures perfect compatibility and function, just like a part from the original factory.
Is this difficult to install myself?
Not at all. For most DIYers with basic hand tools, this is a simple, plug-and-play installation. Since we program it beforehand, you avoid the complexity and cost of using dealership scan tools. Just follow our installation guide.
Will this fix my Check Engine Light?
If the Check Engine Light is caused by an internal PCM failure (like code P0601), then yes, this will resolve the issue. However, you should always diagnose the trouble codes first to ensure the problem isn’t a faulty sensor or other component.
What is the difference between a PCM and an ECM?
The terms are often used interchangeably. ECM (Engine Control Module) typically just controls the engine. PCM (Powertrain Control Module) is more common and controls both the engine and the transmission. This part is a PCM.
How do I know for sure my original PCM is bad?
Definitive diagnosis can be tricky. Key indicators are a no-communication issue with a scan tool, specific internal failure codes (P0601-P0608), or erratic behavior that remains after all related sensors and wiring have been checked and confirmed to be good.