Is Your 1999 Grand Am or Alero Running Rough?
If you’re dealing with a persistent Check Engine Light, erratic engine behavior, or a car that just won’t start, a failing Engine Control Module (ECM) is often the culprit. I’ve seen it hundreds of times in the shop: a 1999 Grand Am or Alero with the 3.4L V6 comes in with symptoms that stump everyone else—stalling, poor fuel mileage, or harsh shifting. The ECM is the central computer for your engine, and when it fails, it can create a cascade of frustrating and hard-to-diagnose problems.
The Direct-Fit Solution: A Pre-Programmed 1999 Grand Am ECM
Forget expensive dealership visits and the hassle of finding a local shop that can program a replacement module. This ECM, part number 09361733, is the definitive solution. We take the guesswork out of the repair. When you order, you provide us with your vehicle’s VIN, and we program the module with the latest official GM software updates specific to your car. It arrives at your door ready for a straightforward installation, restoring the precise control your engine needs to run smoothly and efficiently.
Common Symptoms of a Failing 3.4L ECM:
- ✔ Persistent Check Engine Light (CEL) with various codes
- ✔ Engine stalling or cutting out unexpectedly
- ✔ No-start or hard-starting conditions
- ✔ Noticeable decrease in fuel economy
- ✔ Rough or unstable idling
- ✔ Hesitation or stumbling during acceleration
- ✔ Failure to pass emissions testing
Expert Pro Tip: Check Your Connectors Before Installation
In my 20+ years of experience, I’ve seen countless modules replaced when the real issue was a poor connection. Before you install your new ECM, take a moment to inspect the vehicle’s wiring harness connectors. Look for any signs of green or white corrosion on the pins or inside the connector housing. Use a small brush and a quality electronic contact cleaner to meticulously clean them. A clean, tight connection is absolutely critical for the new module to function correctly and will prevent future issues.
Plug-and-Play Installation: No Dealer Visit Required
This module is designed for a simple, direct installation. Because we handle the programming, you won’t need any specialized scan tools or a trip to the dealer. Just follow these steps to get your Grand Am or Alero back on the road.
- Safety First: Disconnect the negative terminal from your car’s battery and wait at least 15 minutes to allow the system to fully discharge.
- Locate the ECM: On the 1999 Grand Am and Alero, the ECM is typically found inside the vehicle, on the left-hand (driver’s) side of the center dash area. You may need to remove a lower dash panel for access.
- Disconnect the Old Module: Carefully unplug the electrical connectors from the old ECM. There are usually release tabs that need to be pressed or lifted. Never force the connectors.
- Remove the Old ECM: Unbolt the old module from its mounting bracket. Keep the hardware, as you will need it for the new unit.
- Install the New ECM: Mount your new, pre-programmed ECM onto the bracket and secure it with the original hardware.
- Reconnect Everything: Firmly plug the wiring harness connectors into the new module until they click into place. Reconnect your vehicle’s negative battery terminal.
- Final Steps: Your vehicle may need to complete a drive cycle for all systems to recalibrate. In most cases, it will start and run correctly immediately.
Guaranteed Compatibility
This Engine Control Module is a direct replacement for part number 09361733 (also listed as 9361733). It is specifically for the following vehicles:
- 1999 Pontiac Grand Am with 3.4L engine (ID 9361733)
- 1999 Oldsmobile Alero with 3.4L engine (ID 9361733)
By providing your VIN, you ensure that you receive a perfectly matched computer, loaded with the correct software to restore your vehicle’s factory performance and reliability. Don’t let a faulty ECM keep you off the road any longer.