Is Your Late 90s GM Vehicle Running Rough?
If you’re dealing with baffling issues like intermittent stalling, erratic transmission shifting, a persistent check engine light, or a no-start condition in your 1998-1999 Oldsmobile Cutlass or other compatible GM model, the root cause is often a failing Powertrain Control Module (PCM). After two decades of heat cycles and vibrations, the internal components of the original PCM can begin to break down, leading to frustrating and hard-to-diagnose problems.
The Direct-Fit, Programmed Solution
This isn’t just a replacement part; it’s a complete resolution. We are offering a high-quality replacement PCM, service number 16236757, that arrives at your doorstep fully programmed to your vehicle’s specific Vehicle Identification Number (VIN). We load the latest, most stable software updates directly from GM, which often correct drivability issues that were present even when the car was new. This ensures optimal engine performance, fuel efficiency, and transmission function right out of the box.
“A customer’s ’98 Grand Prix came in last week with these exact symptoms…”
The car would run fine for 10 minutes, then suddenly stall and refuse to restart for an hour. The owner had already replaced the fuel pump and ignition control module. From my 20+ years of experience with these GM platforms, I suspected the PCM. We hooked up a scope and watched the 5-volt reference signal to the sensors. Sure enough, as the engine bay heated up, the voltage would drop out completely, killing the engine. This is a classic sign of internal solder joint failure inside the PCM. We installed one of our pre-programmed modules, and the car has run flawlessly ever since. Don’t chase ghosts—address the source.
Common Symptoms of a Failing 1998-1999 Cutlass PCM:
- ✔ Unexplained Check Engine Light (CEL) with various codes
- ✔ Vehicle stalls unexpectedly, especially when warm
- ✔ Harsh or delayed automatic transmission shifts
- ✔ Complete no-start condition with power to all other systems
- ✔ Noticeable decrease in fuel economy
- ✔ Engine misfires or runs rough
Simple, DIY-Friendly Installation
You can restore your vehicle’s performance without a costly trip to the dealership. Our plug-and-play module makes the installation straightforward for any DIY mechanic. Just follow these steps:
- Safety First: Disconnect the negative terminal from your car’s battery to prevent any electrical shorts.
- Locate the PCM: On most compatible vehicles like the ’99 Cutlass or Alero, the PCM is located in the center of the dash, often accessible by removing the glove box. On vans like the Venture or Silhouette, it’s typically in the engine compartment. Consult a repair manual for your specific model.
- Disconnect Connectors: Carefully unclip the wiring harness connectors from the old module. Inspect the pins for any corrosion or damage. If you see any green or white powder, clean the harness connectors thoroughly with a contact cleaner before proceeding.
- Swap the Modules: Unbolt the old PCM and remove it. Secure the new, pre-programmed module in its place.
- Reconnect Everything: Firmly plug the wiring harnesses into the new PCM until they click. Reconnect your vehicle’s negative battery terminal.
- Final Step: Start the engine. The vehicle will now run on the new module with the correct programming for your VIN. In some cases, a security relearn procedure may be required, which can typically be done without special tools.
Guaranteed Compatibility
This module is a direct replacement for a wide range of 1998 and 1999 General Motors vehicles. It is compatible with multiple service numbers to ensure a perfect match. Please verify your part number or provide your VIN to confirm fitment.
- Part Number: 16236757
- Interchangeable Service Numbers: 09356741, 9356741, 9357034, 9357440, 9366314
By providing us with your VIN at checkout, you guarantee that you will receive a part that is 100% correct for your vehicle’s specific options and systems. Restore the reliability and performance of your car today.