Restore Your GM Vehicle’s Core Performance and Reliability
Is your 1997 Pontiac Trans Sport or another GM vehicle from that era running rough, stalling unexpectedly, or showing a persistent Check Engine Light? These are classic signs of a failing Powertrain Control Module (PCM), the computer that serves as your vehicle’s brain. Over time, internal components can degrade, leading to frustrating and unpredictable issues. This replacement PCM, part number 16218070, is the direct, reliable solution to bring your engine and transmission back into perfect harmony.
What sets our service apart is the critical pre-programming. Before this module ships, we flash it with the latest official GM software updates specifically for your vehicle. All we need is your Vehicle Identification Number (VIN) at checkout. This step is essential—it ensures the PCM communicates flawlessly with your vehicle’s specific systems, from the 3.4L V6 engine to the transmission controls. You get a part that is truly ready to install right out of the box, eliminating the need for expensive dealership programming or specialized scan tools.
Case Study: A Tricky Diagnosis
I remember a 1997 Pontiac Bonneville that came into my shop with a complaint that stumped two other mechanics. The car would randomly refuse to shift out of first gear, but there were no transmission codes. After a few miles, it would suddenly start shifting normally. We checked everything—fluid, solenoids, wiring. On a hunch, I monitored the live data from the PCM and noticed the vehicle speed sensor signal would drop out intermittently, but only on the PCM’s data stream; the sensor itself was fine. The culprit was a failing processor inside the original PCM. We installed a correctly programmed module just like this one, and the phantom shifting problem was gone for good. These older PCMs can cause some of the most bizarre symptoms, and a quality replacement is often the only true fix.
Key Indicators of a Failing PCM
If your vehicle is experiencing any of the following, a faulty engine computer could be the root cause. Replacing your old module with this quality 1997 Trans Sport PCM can resolve these issues.
- ✔ Check Engine Light is on with codes like P0601 (Internal Control Module Memory Check Sum Error) or other communication faults.
- ✔ The engine cranks but refuses to start, or starts and immediately stalls.
- ✔ Noticeable decrease in fuel economy for no apparent reason.
- ✔ Harsh, erratic, or delayed automatic transmission shifting.
- ✔ Rough or unstable engine idle.
- ✔ Failure to pass an emissions or smog test.
A Straightforward Guide to Installation
This is a job most DIY mechanics can handle in their own driveway with basic hand tools. Our pre-programming makes it a plug-and-play process.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental contact.
- Locate the PCM: On most of these GM vehicles, the PCM is located in the engine bay, often inside the air filter box housing for protection. Consult a repair manual for your specific model if you’re unsure.
- Disconnect Connectors: Carefully release the locking tabs on the wiring harness connectors and pull them straight out from the module. Avoid pulling on the wires themselves.
- Remove the Old Module: Unbolt the PCM from its mounting bracket or housing. Note the orientation of the old unit.
- Install the New PCM: Mount your new, pre-programmed PCM in place of the old one. Re-attach the wiring harness connectors, ensuring they click securely into place.
- Reconnect Power: Re-attach the negative battery terminal. The vehicle may need to complete a security relearn procedure, which typically involves turning the key to the ‘ON’ position for 10-15 minutes.
Verified Vehicle Compatibility
This module is a direct-fit replacement for part numbers 16218070 and 16217058 and is guaranteed to work with the following 1997 models and engine configurations:
- Achieva: 3.1L V6 (6-191)
- Bonneville: 3.8L V6 (6-231), w/o supercharged option
- Century: 3.1L V6 (6-191)
- Cutlass: Supreme models
- Eighty Eight: 3.8L V6 (6-231), w/o supercharged option
- Grand Am: 3.1L V6 (6-191)
- Grand Prix: 3.1L V6 (6-191) & 3.8L V6 (6-231), w/o supercharged option
- LeSabre: 3.8L V6 (6-231)
- Lumina Car: 3.1L V6 (6-191)
- Monte Carlo: 3.1L V6 (6-191)
- Regal: 3.8L V6 (6-231), w/o supercharged option
- Silhouette: 3.4L V6 (6-207)
- Skylark: 3.1L V6 (6-191)
- Trans Sport: 3.4L V6 (6-207)
- Venture: 3.4L V6 (6-207)