Restore Peak Performance to Your GM Vehicle
Is your 1997 Pontiac Bonneville, Grand Prix, or another classic GM vehicle suffering from frustrating issues like a persistent Check Engine Light, erratic shifting, stalling, or poor fuel economy? The Powertrain Control Module (PCM), the electronic brain of your engine and transmission, is often the culprit. Over time, internal components can degrade, leading to communication errors and performance problems that can be a nightmare to diagnose. This replacement PCM, part number 19109047, is the definitive solution to restore your vehicle’s reliability and driveability.
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). This ensures it has the latest GM software updates, correcting factory bugs and optimizing performance. It’s a direct-fit replacement, designed to get you back on the road with confidence.
Common Signs of a Failing Powertrain Control Module
From my 20+ years in the diagnostic bay, I’ve seen how a failing PCM can mimic a dozen other problems. If you’re experiencing any of the following, your module is a likely suspect. A failing unit can also trigger specific Diagnostic Trouble Codes (DTCs).
- ✔ Unexplained Check Engine Light illumination
- ✔ Engine stalling or refusing to start
- ✔ Harsh or delayed automatic transmission shifting
- ✔ A noticeable drop in fuel mileage
- ✔ Misfires or rough idling, even after replacing plugs and wires
- ✔ Communication error codes, such as the infamous P0601 (Internal Control Module Memory Check Sum Error)
- ✔ Intermittent issues that disappear and then return without warning
Case Study: A Tricky Diagnosis
I remember a 1997 Grand Prix GTP with the supercharged 3.8L that came into my shop. The owner had spent a fortune chasing an intermittent no-start condition. It would run perfectly for a week, then refuse to start for an hour. No codes were stored. After checking all the basics—fuel pressure, spark, crank sensor—we hooked up a lab scope to the PCM’s power and ground circuits. We discovered that during a no-start event, the PCM wasn’t commanding the fuel pump relay on. A quick tap on the PCM case would sometimes make it start. The culprit was a hairline fracture on the internal circuit board. A new, properly programmed PCM fixed it permanently. This highlights why a reliable module is critical.
Straightforward Guide to Your 1997 Bonneville PCM Installation
This is a repair many DIY enthusiasts can handle with basic tools. The key is our VIN-specific programming, which eliminates the need for a trip to the dealership for software flashing. Follow these general steps for a successful installation.
- Safety First: Always 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 GM vehicles, the PCM is located inside the air filter housing in the engine bay. You may need to remove the air filter and intake ducting to access it.
- Disconnect Connectors: Carefully unclip the wiring harness connectors from the old module. These connectors have locking tabs; be gentle to avoid breaking them. Note their orientation.
- Remove the Old Module: Unbolt the PCM from its mounting bracket or housing. It’s typically held in by a few small bolts or clips.
- Install the New PCM: Mount your new, pre-programmed module in the same location. Reconnect the wiring harnesses, ensuring they click securely into place.
- Reconnect Battery: Re-attach the negative battery terminal.
- Perform Security Relearn: Your vehicle may require a simple security relearn procedure. Typically, this involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’ for 10 seconds, and repeating this cycle three times. This allows the new PCM to sync with your vehicle’s anti-theft system.
Verified Vehicle Compatibility
This module is a direct replacement for part numbers 19109047 and 16227797. It is guaranteed to fit the following 1997 models with the specified options:
- ✔ Bonneville: with 3.8L (6-231) supercharged engine
- ✔ Eighty Eight: with 3.8L (6-231) supercharged engine
- ✔ Grand Prix: with 3.8L (6-231) supercharged engine
- ✔ Regal: with 3.8L (6-231) supercharged engine
- ✔ Camaro: with 3.8L (6-231) engine
- ✔ Firebird: with 3.8L (6-231) engine
- ✔ Park Avenue: with 3.8L (6-231) engine
- ✔ Riviera: with 3.8L (6-231) engine
- ✔ Lumina Car: with 3.4L (6-207) engine
- ✔ Monte Carlo: with 3.4L (6-207) engine
Frequently Asked Questions
How do I provide my VIN for programming?
After completing your purchase, please send us a message with your 17-digit Vehicle Identification Number (VIN). We cannot ship your order until we receive this information, as it is essential for programming the module correctly for your vehicle.
Is this part difficult to install for a DIYer?
For most individuals with basic mechanical skills, this is a very manageable job. The most critical part, the programming, is already done for you. The physical replacement typically requires only common hand tools. Please see our installation guide above.
Will I need to do anything after installing it?
Yes, you will likely need to perform a security relearn procedure, also known as a VATS relearn. This is a simple process that syncs the new PCM to your car’s anti-theft system and does not require special tools. Instructions are included in our installation guide.
Does this PCM come with a warranty?
Yes, all of our electronic modules come with a comprehensive warranty. Please check the warranty tab on this listing for specific details and duration. We stand behind the quality of our parts and programming.
How do I know if the PCM is really the problem?
While the symptoms listed are strong indicators, a definitive diagnosis is always best. This often involves checking for specific PCM-related trouble codes (like P0601-P0606) and verifying good power and ground signals at the module’s connector. If other potential causes like sensors or wiring have been ruled out, the PCM is the most likely failure point.