Restore Peak Performance to Your GM Vehicle
If you’re dealing with frustrating engine problems like stalling, a persistent Check Engine Light, or erratic performance in your 1999 Oldsmobile Alero, the culprit is often a failing Powertrain Control Module (PCM). As the central computer for your engine, its proper function is critical. This isn’t just a replacement part; it’s a comprehensive solution. We provide a reliable PCM, part number 9356741, that comes fully programmed with the latest GM software updates specifically for your vehicle. Simply provide your Vehicle Identification Number (VIN) after your purchase, and we handle the complex programming before it even ships. This eliminates the need for an expensive trip to the dealership and gets you back on the road with confidence.
Is Your GM Vehicle Showing These Signs?
A faulty PCM can cause a wide range of issues that can be misdiagnosed. Over my two decades in diagnostics, I’ve seen these modules cause symptoms that baffle many technicians. If you’re experiencing any of the following, a failing PCM is a likely cause:
- ✔ Persistent Check Engine Light with codes like P0601 (Internal Control Module Memory Check Sum Error) or other communication-related faults.
- ✔ Unexplained engine stalling or shutting off while driving.
- ✔ Rough or inconsistent idling.
- ✔ A noticeable decrease in fuel economy.
- ✔ Harsh or delayed transmission shifting.
- ✔ Complete no-start condition where the engine cranks but won’t fire up.
- ✔ Failure to pass an emissions test.
Case Study: A Tricky Diagnosis
I once had a 1998 Pontiac Grand Am with the 3.1L V6 in my bay that had the most frustrating intermittent stalling problem. The owner had already replaced the fuel pump and crank sensor. It would run perfectly for days, then suddenly die at a stoplight. No codes were stored. After checking all the usual suspects, I noticed the stalling only happened after the engine was fully heat-soaked on a hot day. On a hunch, I used a heat gun to carefully warm the PCM while the engine was idling. Within two minutes, the engine sputtered and died. The internal circuits were failing under heat. Replacing the PCM, just like this 1999 Alero Powertrain Control Module, resolved the issue completely. It’s a classic failure mode for these units.
A Straightforward Guide to Installation
Installing your pre-programmed 1999 Alero Powertrain Control Module is a manageable job for a DIYer with basic tools. Our goal is to make this as simple as possible, but always prioritize safety.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 10 minutes to allow the system to fully discharge before you begin.
- Locate the PCM: On most of these vehicles, the PCM is located in the engine compartment, often inside the air filter housing or mounted to the firewall. On some models like the Alero or Grand Am, it may be under the dash on the left-hand (driver’s) side.
- Disconnect the Connectors: Carefully unlatch and remove the electrical wiring harness connectors from the old module. These connectors have locking tabs that need to be released—never force them.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket and remove it from the vehicle.
- Install the New Module: Mount your new, pre-programmed PCM securely in place and reconnect the wiring harness connectors, ensuring they click and lock firmly.
- Reconnect the Battery: Reattach the negative battery terminal.
- Security Relearn (If Necessary): Some GM vehicles require a simple key-cycle security relearn procedure to sync the new PCM with your vehicle’s anti-theft system. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times before starting the engine.
Verified Vehicle Compatibility List
This module is a direct-fit replacement for a wide range of General Motors vehicles. Please verify your vehicle, year, and engine options below. This part is compatible with service numbers: 09356741, 16236757, 9357034, 9357440, 9366314.
ALERO (3.4L, ID 16236757, 9356741, 9357440)
CUTLASS (ID 16236757)
GRAND AM (3.4L, ID 16236757, 9356741, 9357034, 9347440, 9366314)
1998 Models:
ACHIEVA (6-191, 3.1L)
BONNEVILLE
CAMARO (6-231, 3.8L)
CENTURY (6-191, 3.1L)
CUTLASS
EIGHTY EIGHT
FIREBIRD (6-231, 3.8L)
GRAND AM (6-191, 3.1L)
GRAND PRIX
INTRIGUE
LESABRE (6-231, 3.8L)
LUMINA CAR
MALIBU (6-191, 3.1L)
MONTE CARLO
PARK AVENUE (6-231, 3.8L)
REGAL
RIVIERA (6-231, 3.8L)
SILHOUETTE
SKYLARK (6-191, 3.1L)
TRANS SPORT
VENTURE (6-207, 3.4L)
Do I need to do any programming myself?
Do I need to do any programming myself?
No. This is the biggest benefit of our service. We program the module to your car’s specific VIN before we ship it. It arrives ready for installation, saving you hundreds of dollars in dealership programming fees.
Why do you need my VIN?
The Vehicle Identification Number (VIN) is essential for us to load the correct GM-certified software for your car’s specific engine, transmission, and options. This ensures perfect compatibility and performance.
Is this a true plug-and-play part?
Yes, for 99% of installations. Once programmed to your VIN, it’s a direct swap. In some cases, a simple ‘Security Relearn Procedure’ (which you can do yourself in 30 minutes with just the ignition key) is needed to sync the module with your car’s anti-theft system.
My original part has a different service number. Will this still work?
Yes, as long as your service number is on our compatibility list (09356741, 16236757, 9357034, 9357440, 9366314). Manufacturers often supersede part numbers. Our module is programmed to be a correct replacement for all listed service numbers.