Restore Peak Performance to Your GM Vehicle
Is your late-90s GM car or truck suffering from mysterious and frustrating issues? An erratic idle, poor fuel economy, stalling, or a persistent Check Engine Light can often be traced back to a single, critical component: the Powertrain Control Module (PCM). As the central computer for your engine, the PCM is responsible for managing everything from fuel injection and spark timing to transmission shifting and emissions control. When it begins to fail, the symptoms can be widespread and difficult to diagnose, often leading to unnecessary replacement of other perfectly good parts.
This replacement PCM, service number 16228016, is the definitive solution for a wide range of popular vehicles, including the Pontiac Grand Am, Chevrolet Cavalier, S10, Malibu, and more. Unlike a generic part from a salvage yard, this module is a complete, ready-to-install solution. We flash it with the latest official GM software updates and program it specifically to your vehicle’s unique Vehicle Identification Number (VIN). This critical step ensures seamless communication with all other modules in your vehicle, restoring the original factory performance and reliability without requiring a costly trip to the dealership for programming.
From the Diagnostic Bay
We had a 1998 Chevy S10 with the 2.2L engine come into the shop that was a real head-scratcher. The owner had replaced the spark plugs, wires, and even the fuel pump trying to chase down an intermittent misfire and stalling issue that no one could solve. The truck would run fine for a few days, then suddenly start running rough and die at stoplights. After hooking up our diagnostic scope, we noticed the control signal to the #3 fuel injector was dropping out randomly. The injector itself was fine, the wiring was solid—the issue was the driver circuit inside the original PCM. It was failing intermittently as it heated up. We installed a VIN-programmed PCM, performed the security relearn, and the truck ran perfectly. It’s a classic case of how a failing computer can mimic a mechanical problem, costing the owner time and money on unneeded parts.
Common Symptoms of a Failing PCM
- ✔ Persistent Check Engine Light (CEL) with various trouble codes.
- ✔ Engine stalling or shutting off unexpectedly while driving.
- ✔ Rough or erratic idling and poor engine performance.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Harsh or incorrect automatic transmission shifting.
- ✔ Complete no-start condition where the engine cranks but won’t fire.
- ✔ Failure to communicate with diagnostic scan tools.
Diagnosing and Replacing Your 1997-1999 Grand Am PCM
For owners of the 1997-1999 Pontiac Grand Am, particularly those with the 2.4L engine, a faulty PCM can be a common source of driveability problems. This module is the core of your vehicle’s engine management system. Before condemning the PCM, it’s essential to rule out other potential causes like faulty sensors, wiring issues, or fuel delivery problems. However, if you’ve confirmed these components are working correctly and symptoms persist, the PCM is the most likely culprit. Replacing your 1997-1999 Grand Am PCM with our VIN-programmed unit is the most effective way to solve these complex electronic issues. Our service eliminates the guesswork and provides a component that is ready for installation right out of the box, ensuring your vehicle operates as the manufacturer intended.
Simple Installation Process
Installation is straightforward for a DIY mechanic with basic tools. After disconnecting the battery, you’ll locate your old module (locations vary by model, see FAQ below), disconnect the wiring harnesses, and unbolt it. Simply install the new module in its place, reconnect the harnesses and battery, and perform the security relearn procedure (often called a CASE learn), which can typically be done without special tools. This simple process gets you back on the road quickly and confidently.
Compatible Service Numbers:
This module directly replaces part numbers 16228016, 8162280160, and 16245305. Please verify your part number before ordering to ensure compatibility.
Vehicle Fitment:
This part is a confirmed fit for the following vehicles with the specified options:
- ACHIEVA 97-98 Electronic Control Module; 4-146 (2.4L)
- CAVALIER 97-99 Electronic Control Module; (RH front engine compartment)
- GRAND AM 99 Electronic Control Module; (LH center dash), 2.4L, ID 16228016
- GRAND AM 97-98 Electronic Control Module; 4-146 (2.4L)
- ISUZU HOMBRE 96 Electronic Control Module
- ISUZU HOMBRE 97-98 Electronic Control Module; 2.2L (4 cylinder)
- ISUZU HOMBRE 99-00 Electronic Control Module; (RH front engine compartment), 2.2L (4 cylinder)
- MALIBU 97-98 Electronic Control Module; 4-146 (2.4L)
- MALIBU 99 Electronic Control Module; (LH dash), 2.4L
- S10/S15/SONOMA 97-98 Electronic Control Module; 4-134 (2.2L)
- S10/S15/SONOMA 99 Electronic Control Module; (RH front engine compartment), 2.2L
- S10/S15/SONOMA 00 Electronic Control Module; (RH front engine compartment), 2.2L, VIN 4 (8th digit)
- SKYLARK 97-98 Electronic Control Module; 4-146 (2.4L)
- SUNFIRE 97-99 Electronic Control Module; (RH front engine compartment)
Frequently Asked Questions
Do I need to have this computer programmed by a dealer?
No. We handle all the programming for you before shipment. We flash the module with the latest GM software updates using the VIN you provide, so it arrives ready to install.
How do I provide my VIN?
After you complete your purchase, simply send us a message with your vehicle’s 17-digit VIN. We cannot ship your part until we receive this information.
Will I need to perform any other procedures after installation?
Yes, on most of these GM vehicles, you will need to perform a security relearn procedure (also known as a CASE learn or Passlock relearn). This syncs the new PCM with your vehicle’s anti-theft system. It’s a simple procedure that typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times. Instructions are widely available online for your specific model.
Where is the PCM located on my vehicle?
The location varies. On S10/Sonoma, Cavalier, and Sunfire models, it’s typically in the engine compartment on the passenger side. On the Grand Am and Malibu, it’s often located inside the vehicle, behind the dash on the driver’s or passenger’s side. Always consult a repair manual for your specific vehicle to confirm the location.
What if my original part number is slightly different?
This module is a direct replacement for service numbers 16228016, 8162280160, and 16245305. If your part number is one of these, this module will work for your vehicle, provided your model is on the compatibility list.