Restore Your Engine’s Brain and Get Back on the Road with Confidence
Is your 1997 GM vehicle suffering from frustrating issues like a persistent check engine light, erratic shifting, stalling, or a no-start condition? These are classic signs of a failing Powertrain Control Module (PCM), the central computer that manages your engine and transmission. Driving with a faulty PCM isn’t just annoying—it can lead to poor fuel economy, failed emissions tests, and potential damage to other components. This isn’t a problem you should ignore.
As a technician with over two decades of experience, I’ve seen firsthand how a failing PCM can mimic a dozen other problems, leading to costly and incorrect repairs. This module is the direct, reliable solution. We take the guesswork out of the equation by pre-programming this PCM specifically for your vehicle using your VIN. It arrives loaded with the latest GM software updates, ensuring optimal performance and communication with your car’s systems right out of the box. This eliminates the need for an expensive trip to the dealership for programming.
Common Signs of a Failing PCM
- ✔ Your vehicle fails to start or starts intermittently.
- ✔ The check engine light is on, often with codes like P0601 (Internal Control Module Memory Check Sum Error) or other communication errors.
- ✔ You experience a noticeable drop in fuel mileage.
- ✔ The engine runs rough, misfires, or stalls unexpectedly.
- ✔ The automatic transmission shifts harshly, erratically, or not at all.
- ✔ You’ve failed an emissions or smog test.
From the Diagnostic Bay
I remember a 1997 Pontiac Grand Prix that came into my shop with a maddening intermittent no-start condition. The owner had already replaced the battery, alternator, and crank sensor. All the basic power and ground tests to the PCM checked out fine. The problem was, the PCM’s internal processor was failing only when it warmed up. On a cold start, it was fine. After 15 minutes of driving, it would die and refuse to restart for an hour. This is a common failure mode for these modules due to heat cycles and aging internal capacitors. Swapping in a properly programmed PCM like this one solved the issue instantly. It’s a reminder that sometimes, the ‘brain’ itself is the problem, even when it seems to be getting the right signals.
A Straightforward Guide to Installation
Replacing your 1997 Century Powertrain Control Module is a manageable job for a DIYer with basic tools. Following these steps will ensure a smooth process.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 15 minutes for any residual power to dissipate.
- Locate the PCM: On most of these 1997 GM models, the PCM is located in the engine bay, typically inside the air filter box assembly for protection.
- Disconnect Connectors: Carefully unclip and remove the wiring harness connectors from the old module. These connectors have locking tabs; be gentle to avoid breaking them.
- Remove the Old Module: Unbolt the PCM from its mounting bracket or housing. It’s usually held in by a few small bolts or clips.
- Install the New Module: Seat your new, pre-programmed PCM into the mounting bracket and secure it.
- Reconnect Everything: Firmly plug the wiring harnesses back into the new module until they click into place. Reconnect your negative battery terminal.
- Perform Security Relearn: Your vehicle may require a simple security relearn procedure to recognize the new PCM. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times before starting the engine. Consult your vehicle’s specific procedure if needed.
Verified Vehicle Compatibility
This module is a direct replacement for part numbers 16218070 and 16217058. It is guaranteed to fit the following 1997 models with the specified options:
Bonneville: 1997 w/ 3.8L (6-231) Engine (w/o supercharged option)
Century: 1997 w/ 3.1L (6-191) Engine
Cutlass: 1997 Supreme models
Eighty Eight: 1997 w/ 3.8L (6-231) Engine (w/o supercharged option)
Grand Am: 1997 w/ 3.1L (6-191) Engine
Grand Prix: 1997 w/ 3.1L (6-191) or 3.8L (6-231) Engine (w/o supercharged option)
LeSabre: 1997 w/ 3.8L (6-231) Engine
Lumina Car: 1997 w/ 3.1L (6-191) Engine
Monte Carlo: 1997 w/ 3.1L (6-191) Engine
Regal: 1997 w/ 3.8L (6-231) Engine (w/o supercharged option)
Silhouette: 1997 w/ 3.4L (6-207) Engine
Skylark: 1997 w/ 3.1L (6-191) Engine
Trans Sport: 1997 w/ 3.4L (6-207) Engine
Venture: 1997 w/ 3.4L (6-207) Engine
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) is essential. It allows us to load the exact, correct GM-certified software for your car’s specific engine, transmission, and options. This ensures perfect compatibility and performance, saving you a trip to the dealer.
Is this a simple plug-and-play installation?
Yes, for the most part. Because we pre-program it, you will not need any special scan tools. However, many GM vehicles from this era require a simple ‘Security Relearn’ procedure after installation, which you can do yourself with just the ignition key. We include instructions for this common procedure.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the old PCM (like code P0601), then yes, this new module will resolve it. If the light is on for another reason, like a bad oxygen sensor, you will still need to fix that separate issue.
What if I order the wrong part?
We strongly recommend verifying your part number and using our detailed compatibility list. Providing your VIN during checkout is the best way to guarantee you receive the correct, programmed module for your vehicle, preventing compatibility issues.
Does this part replace number 16217058?
Yes, this module, part number 16218070, is the correct and updated replacement for the older 16217058 part number.