Is Your Oldsmobile Alero Running Rough?
If you’re dealing with frustrating issues like a persistent check engine light, erratic engine performance, stalling, or poor fuel economy in your 1999 Alero, a failing Powertrain Control Module (PCM) is often the culprit. As a mechanic with over two decades of experience, I’ve seen how a faulty PCM can wreak havoc on a vehicle’s drivability. It’s the brain of your engine, and when it starts to fail, it can send incorrect signals to everything from your fuel injectors to your transmission, making diagnosis a nightmare.
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We take the guesswork and extra cost out of the repair by programming this module specifically to your vehicle’s VIN. This ensures it has the latest GM software updates and communicates perfectly with all the other modules in your car, just like the original did.
From the Shop Floor: “A customer’s 1999 Grand Am with the 3.4L engine—which uses this exact same PCM—came in last week. The car would intermittently stall at red lights and had a check engine light that previous shops couldn’t solve. After confirming power and grounds were good, we diagnosed a faulty PCM. Swapping in one of our VIN-programmed modules solved the stalling and cleared the codes permanently. The customer was back on the road in under an hour, without a trip to the dealership.”
Why Choose Our Pre-Programmed 1999 Alero PCM?
Getting your car running right shouldn’t be complicated. This module is designed to restore your vehicle’s original performance and reliability with minimal downtime. It’s a direct solution for a wide range of GM vehicles from that era, including the Pontiac Grand Am, Chevy Malibu, and Buick Century.
- âś” VIN-Specific Programming: Arrives flashed with the latest GM software for your exact vehicle.
- âś” No Extra Fees: Skip the expensive dealership programming and key relearn procedures.
- âś” Restores Performance: Corrects issues like rough idle, poor shifting, and false sensor codes.
- âś” Direct Fit Guarantee: Matches OEM specifications for a hassle-free installation. This module is a direct replacement for service numbers 09356741, 16236757, 9357034, 9357440, and 9366314.
Plug-and-Play Installation: Get Back on the Road Fast
You can install this module yourself with basic hand tools. Just follow these simple steps:
- Safety First: Disconnect the negative terminal from your car’s battery.
- Locate the PCM: On most Alero and Grand Am models, the PCM is located inside the air filter housing assembly for protection.
- Disconnect and Remove: Carefully unclip the wiring harnesses and remove the bolts holding the old module in place.
- Install the New Module: Seat the new PCM, secure it with the bolts, and firmly reconnect the wiring harnesses until they click.
- Final Step: Reconnect the negative battery terminal. Your car is now ready to start.
Expert Pro Tip: Before plugging in your new PCM, take a moment to inspect the pins on your vehicle’s wiring harness connectors. Over time, moisture can cause a fine layer of green or white corrosion to build up. Use a small brush and a dedicated electronics contact cleaner to gently clean the pins. This simple step ensures a perfect connection and prevents many hard-to-diagnose electrical gremlins down the road.