Is Your 1999 Alero Running Rough, Stalling, or Throwing Confusing Codes?
If you’re dealing with frustrating engine problems like a persistent check engine light, poor fuel mileage, erratic shifting, or even a no-start condition, the cause is often a failing Powertrain Control Module (PCM). As a technician with over two decades of experience, I’ve seen how a faulty PCM can turn a reliable GM vehicle into a source of constant headaches. The PCM is the brain of your engine and transmission, and when it fails, the symptoms can be widespread and difficult to diagnose.
The Direct Solution: A VIN-Programmed PCM
This isn’t just a replacement part; it’s a complete solution. We are providing a dependable Powertrain Control Module for your 1999 Oldsmobile Alero that comes fully programmed to your vehicle’s specific Vehicle Identification Number (VIN). This critical step ensures that the module communicates perfectly with your car’s existing systems, just like the original from the factory. We flash it with the latest GM software updates, which can often resolve drivability issues that were present even with the old unit.
- ✔ Ready to Install: Arrives programmed to your car’s VIN. No expensive dealer programming needed.
- ✔ Restores Performance: Corrects common issues like rough idle, poor acceleration, and harsh shifting.
- ✔ Clears Fault Codes: A reliable fix for persistent engine codes related to module failure.
- ✔ Latest Software: Flashed with the newest stable software releases from GM for optimal function.
- ✔ Wide Compatibility: A direct replacement for multiple service numbers, including 09356741, 16236757, 9357034, 9357440, and 9366314.
Expert Pro Tip: Check This Before You Replace!
In my shop, I’ve seen countless cases where a PCM was blamed for issues caused by something much simpler. Before you install your new module, take 10 minutes to inspect and clean the main PCM electrical connectors with a quality electronics cleaner. Also, locate and clean the main engine-to-chassis ground strap. On these GM platforms, a corroded ground can cause voltage drops that mimic PCM failure, leading to a frustrating misdiagnosis. A clean, solid connection is key.
Easy Installation for Your 1999 Alero Powertrain Control Module
You don’t need to be a master mechanic to install this part. The process is straightforward and can be done with basic hand tools. For the 1999 Alero, the PCM is typically located on the left-hand (driver’s) side, under the center of the dashboard.
- Safety First: Disconnect the negative terminal from your car’s battery and wait 10 minutes for the system to discharge.
- Locate the PCM: Access the module under the driver’s side dash. You may need to remove a lower dash panel for clear access.
- Disconnect the Old Module: Carefully unplug the electrical harness connectors. They have locking tabs that need to be released before pulling.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket.
- Install the New Module: Bolt your new, pre-programmed PCM into place and securely reconnect the electrical harnesses. You should hear a ‘click’ as they lock.
- Reconnect Battery: Re-attach the negative battery terminal. Your Alero is now ready to start with its new brain.
Guaranteed Fitment for Your GM Vehicle
While this is a perfect fit for the 1999 Alero with the 3.4L engine, this versatile module was used across a wide range of GM cars from 1998 and 1999. Please verify your part number or match your vehicle from the list below to ensure compatibility.
This module is a direct replacement for the following vehicles with matching options:
- Alero (1999) – 3.4L, ID 16236757, 9356741, 9357440
- Achieva (1998) – 3.1L
- Bonneville (1998)
- Camaro (1998) – 3.8L
- Century (1998) – 3.1L
- Cutlass (1998-1999)
- Eighty Eight (1998)
- Firebird (1998) – 3.8L
- Grand Am (1998-1999) – 3.1L, 3.4L
- Grand Prix (1998)
- Intrigue (1998)
- LeSabre (1998) – 3.8L
- Lumina Car (1998)
- Malibu (1998) – 3.1L
- Monte Carlo (1998)
- Park Avenue (1998) – 3.8L
- Regal (1998)
- Riviera (1998) – 3.8L
- Silhouette (1998)
- Skylark (1998) – 3.1L
- Trans Sport (1998)
- Venture (1998) – 3.4L
After purchase, simply reply to your order confirmation email with your vehicle’s 17-digit VIN. We’ll handle the programming and ship your ready-to-install PCM directly to you.