Restore Peak Performance to Your 1997 GM Vehicle
Is your 1997 Pontiac Bonneville or other GM car suffering from frustrating issues like a persistent check engine light, poor fuel economy, stalling, or erratic transmission shifting? These are classic signs of a failing Powertrain Control Module (PCM), the electronic brain of your vehicle. Don’t let a faulty computer keep you off the road. This replacement PCM, part number 16217058, is the reliable, straightforward solution to bring your vehicle back to life.
With over two decades of hands-on diagnostic experience, I’ve seen countless drivers chase expensive sensor replacements when the root cause was a degraded PCM. This module is your direct path to a lasting fix. We take all the guesswork and hassle out of the process. Before we ship, we flash the module with the latest official GM software updates, specifically programmed to your vehicle’s unique Vehicle Identification Number (VIN). This ensures perfect communication between your engine, transmission, and other systems, just as the factory intended. This is the key to a successful repair for your 1997 Bonneville PCM.
A Technician’s Notebook
I remember a 1997 Pontiac Grand Prix with the 3.8L that came into the shop. The owner had already replaced the MAF sensor and two O2 sensors trying to fix a lean condition code and terrible gas mileage. The scan tool showed erratic fuel trim numbers that didn’t make sense. Instead of throwing more parts at it, we tested the command signals from the PCM. We found the injector driver circuit inside the original computer was failing, providing inconsistent signals. We installed a VIN-programmed PCM just like this one, and the fuel trims immediately stabilized. It’s a perfect example of how a failing computer can mimic sensor problems, and why a quality, correctly programmed module is the only true fix.
Common Signs of a Failing Engine Computer
- ✔ Persistent Check Engine Light (CEL)
- ✔ Stalling or rough idling for no apparent reason
- ✔ Noticeable decrease in fuel efficiency
- ✔ Harsh or delayed transmission shifting
- ✔ Engine cranks but refuses to start (no-start condition)
- ✔ Failing an emissions test
- ✔ Diagnostic Trouble Codes (DTCs) related to internal module failure, such as P0601 or P0605.
A Straightforward Guide to Installation
Installing your new 1997 Bonneville PCM is a simple process that most DIY mechanics can handle. Because it arrives programmed, no special tools or dealer visits are required.
- Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
- Locate the Old PCM: On most of these GM models, the PCM is located in the engine bay, often inside the air filter box assembly for protection.
- Disconnect and Remove: Carefully unplug the wiring harness connectors. They have locking tabs that need to be released. Once disconnected, unbolt the module from its mounting bracket.
- Install the New Module: Seat the new PCM into the mounting bracket and securely fasten it. Reconnect the wiring harnesses, ensuring they click firmly into place.
- Reconnect Power: Reattach the negative battery terminal. The vehicle may require a security relearn procedure, which typically involves turning the key to the ‘ON’ position for 10-15 minutes. Consult your owner’s manual for specific steps.
Verified Vehicle Compatibility
This module is a direct replacement for part numbers 16217058 and 16218070. It is guaranteed to fit the following 1997 models with the specified options:
- Achieva: 1997, 6-191 (3.1L)
- Bonneville: 1997, (6-231, 3.8L), without supercharged option
- Century: 1997, (6-191, 3.1L)
- Cutlass: 1997, Supreme
- Eighty Eight: 1997, (6-231, 3.8L), without supercharged option
- Grand Am: 1997, 6-191 (3.1L)
- Grand Prix: 1997, 6-191 (3.1L) or 6-231 (3.8L) without supercharged option
- LeSabre: 1997, (6-231, 3.8L)
- Lumina Car: 1997, 6-191 (3.1L)
- Monte Carlo: 1997, 6-191 (3.1L)
- Regal: 1997, (6-231, 3.8L), without supercharged option
- Silhouette: 1997, (6-207, 3.4L)
- Skylark: 1997, 6-191 (3.1L)
- Trans Sport: 1997, (6-207, 3.4L)
- Venture: 1997, (6-207, 3.4L)
By providing your VIN upon purchase, you ensure this 1997 Bonneville PCM is a perfect match, restoring your car’s reliability and drivability.
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to load the exact, correct GM software for your car’s specific engine, transmission, and options. This step is critical for ensuring your vehicle runs properly and is the reason our modules are a plug-and-play solution.
Is this part difficult to install?
Not at all. For most DIYers, this is a simple, one-hour job. Since the module comes pre-programmed, you just need basic hand tools to swap the old unit for the new one. No trips to a mechanic or dealer are necessary for programming.
Will this fix my check engine light?
If the check engine light is caused by a faulty PCM or an internal module error code (like P0601), this part will resolve the issue. It’s always best to have your vehicle scanned for codes to confirm the diagnosis before ordering.
What if my part number isn’t an exact match?
This module replaces both part numbers 16217058 and 16218070. As long as your vehicle is on the compatibility list and you need one of these two part numbers, this is the correct component for you.
Do I need to do anything after installation?
Some GM vehicles of this era require a simple security relearn procedure after the battery has been disconnected. This usually involves leaving the key in the ‘ON’ position for 10-15 minutes. We recommend checking your vehicle’s specific procedure, but it does not require any special tools.