Is your 1997 Pontiac Bonneville, Grand Prix, or another GM vehicle with the legendary 3.8L or 3.4L engine acting up? If you’re dealing with frustrating issues like a persistent check engine light, erratic engine behavior, or a no-start condition, the culprit is often a failing Powertrain Control Module (PCM). This essential component is the brain of your vehicle’s engine and transmission, and when it falters, performance and reliability suffer. This is a direct replacement, VIN-programmed PCM, part number 16227797, designed to restore your vehicle’s factory operation and get you back on the road with confidence.
Diagnosing a Faulty 1997 Bonneville PCM
The PCM is a complex computer responsible for managing fuel injection, ignition timing, transmission shifting, and emissions systems. Over time, heat, vibration, and age can cause internal components to fail. A failing PCM can manifest in various ways, often mimicking other sensor or component failures, which can make diagnosis tricky. Before condemning the module, it’s wise to check all related sensors, wiring, and grounds. However, if other potential causes have been ruled out, replacing the PCM is the definitive solution.
I once had a ’97 Regal with the supercharged 3.8L come in on a tow truck. The owner had replaced the crank sensor, cam sensor, and ignition control module trying to solve an intermittent stall and no-start problem. The codes were all over the place—random misfires, communication errors, you name it. After verifying the wiring was solid, we hooked up a lab scope to the PCM’s main power and ground feeds. We saw significant voltage drops and electrical noise that pointed directly to an internal failure in the module. We installed a VIN-programmed PCM, performed the security relearn, and the car fired right up and ran perfectly. It’s a classic case of how a bad PCM can send you chasing ghosts all over the engine bay.
Common Symptoms of PCM Failure
- ✔ Persistent Check Engine Light (CEL) with various trouble codes.
- ✔ Engine stalling, stumbling, or hesitating during acceleration.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ A complete no-start condition where the engine cranks but won’t fire.
- ✔ Poor fuel economy and reduced engine power.
- ✔ Failure to communicate with a diagnostic scan tool.
- ✔ Inaccurate or non-functioning dashboard gauges.
Why VIN Programming is Essential
You can’t simply swap a used PCM from another vehicle. In 1997, GM vehicles used a sophisticated Vehicle Anti-Theft System (VATS or PassKey) that is tied to the specific Vehicle Identification Number (VIN). This replacement 1997 Bonneville PCM is professionally programmed to your car’s exact VIN before it ships. This process ensures that the module has the correct software and calibrations for your engine, transmission, and all factory options. It also ensures the module will communicate correctly with the other computers in your vehicle, making installation as straightforward as possible. After installation, you will only need to perform a simple security relearn procedure, which can be done without any special tools.
Broad Compatibility Across the GM Lineup
This module, part number 16227797 (also interchangeable with 19109047), was used across a wide range of popular 1997 GM models. Please verify your part number and application from the list below:
- Pontiac Bonneville: 1997, Electronic Control Module; (6-231, 3.8L), w/supercharged option
- Pontiac Grand Prix: 1997, Electronic Control Module; 6-231 (3.8L), w/supercharged option
- Pontiac Firebird: 1997, Electronic Control Module; 6-231 (3.8L)
- Chevrolet Camaro: 1997, Electronic Control Module; 6-231 (3.8L)
- Chevrolet Monte Carlo: 1997, Electronic Control Module; 6-207 (3.4L)
- Chevrolet Lumina: 1997, Electronic Control Module; 6-207 (3.4L)
- Buick Regal: 1997, Electronic Control Module; (6-231, 3.8L), w/supercharged option
- Buick Park Avenue: 1997, Electronic Control Module; (6-231, 3.8L)
- Buick Riviera: 1997, Electronic Control Module; (6-231, 3.8L)
- Oldsmobile Eighty Eight: 1997, Electronic Control Module; (6-231, 3.8L), w/supercharged option
Frequently Asked Questions
Do I need to do anything after installing this PCM?
Yes. While the module comes programmed to your VIN, you will need to perform a simple security relearn procedure (often called a VATS relearn). This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating the cycle three times. Instructions are readily available online for your specific model.
How do I provide my VIN?
After you complete your purchase, you will need to send us your 17-digit Vehicle Identification Number (VIN). We cannot ship the module until we receive this information, as the programming is specific to your vehicle.
Is this a plug-and-play part?
Essentially, yes. Once you perform the security relearn, it is ready to go. The module is programmed with the latest GM updates for your vehicle, ensuring optimal performance. No dealership visit is required.
Will this fix my transmission shifting problems?
The PCM controls both the engine and the transmission. If your shifting issues are caused by faulty electronic commands from a failing PCM, then this replacement part will resolve them. However, it will not fix internal mechanical problems with the transmission itself.
What if my original part number is 19109047?
This module is a direct replacement for both 16227797 and 19109047. They are interchangeable, and this unit will function correctly for either original part number.