Restore Peak Performance to Your GM Vehicle
If you’re dealing with a frustrating check engine light, erratic engine behavior, or a no-start condition in your 1999 Oldsmobile Alero or other compatible GM model, a failing Powertrain Control Module (PCM) is a very likely culprit. As the central computer for your engine and transmission, its health is critical. This isn’t just a replacement part; it’s a complete, reliable solution. We take your vehicle’s unique Vehicle Identification Number (VIN) and program this module with the very latest software updates directly from GM. This ensures that when it arrives, it’s ready to resolve known drivability issues and restore the smooth, efficient operation you expect.
Case Study: A Tricky Diagnosis
I remember a 1999 Grand Am with the 3.4L V6 that came into my shop. The owner had already replaced the crank sensor and the MAF sensor chasing an intermittent stalling problem and a P0335 code that would pop up randomly. The diagnostics were pointing everywhere. After checking the wiring harness for the fifth time, we decided to inspect the PCM. On these models, a failing driver inside the module can cause bizarre, inconsistent signals that mimic sensor failures. We swapped in a VIN-programmed PCM like this one, performed the security relearn, and the car ran perfectly. It’s a classic example of how a faulty computer can send you on a wild goose chase, and why a reliable, correctly programmed module is the right fix.
Is Your Vehicle Showing These Symptoms?
- ✔ Persistent Check Engine Light (CEL)
- ✔ Stalling, stumbling, or rough idling
- ✔ Poor fuel economy
- ✔ Harsh or incorrect automatic transmission shifting
- ✔ Vehicle won’t start, but the battery and starter are good
- ✔ Failed emissions test
- ✔ Communication error codes like U0100
- ✔ Internal module fault codes such as P0601, P0602, P0605, or P0606
A Straightforward Guide to Installation
Replacing the PCM on these vehicles is a job most DIYers can handle with basic tools. Our pre-programming service eliminates the need for expensive scan tools or a trip to the dealership for flashing.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before starting any electrical work.
- Locate the Module: On the 1999 Alero and Grand Am, the PCM is typically found inside the vehicle, behind the left-hand (driver’s side) center dash area. On other models like the Silhouette or Lumina, it may be in the engine compartment. Consult a repair manual for your specific vehicle if you’re unsure.
- Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs that need to be released. Once disconnected, unbolt the module from its mounting bracket.
- Install the New Module: Seat the new, programmed module into the bracket and secure it. Firmly reconnect the electrical connectors, ensuring they click into place.
- Reconnect Power: Reattach the negative battery terminal.
- Perform Security Relearn: Your vehicle’s anti-theft system may need to be relearned to the new PCM. This is a simple procedure, often involving turning the key to the ‘ON’ position for 10-15 minutes. Specific instructions for your vehicle are readily available online.
Verified Vehicle Compatibility
This module is a direct replacement for service numbers 09356741, 16236757, 9356741, 9357034, 9357440, and 9366314. It is guaranteed to fit the following vehicles:
- 1999 ALERO – 3.4L (with matching ID)
- 1999 CUTLASS – (with matching ID 16236757)
- 1999 GRAND AM – 3.4L (with matching ID)
- 1998 ACHIEVA – 3.1L
- 1998 BONNEVILLE
- 1998 CAMARO – 3.8L
- 1998 CENTURY – 3.1L
- 1998 CUTLASS
- 1998 EIGHTY EIGHT
- 1998 FIREBIRD – 3.8L
- 1998 GRAND AM – 3.1L
- 1998 GRAND PRIX
- 1998 INTRIGUE
- 1998 LESABRE – 3.8L
- 1998 LUMINA CAR
- 1998 MALIBU – 3.1L
- 1998 MONTE CARLO
- 1998 PARK AVENUE – 3.8L
- 1998 REGAL
- 1998 RIVIERA – 3.8L
- 1998 SILHOUETTE
- 1998 SKYLARK – 3.1L
- 1998 TRANS SPORT
- 1998 VENTURE – 3.4L
Why do I need to provide my VIN?
Your VIN is essential for us to load the exact, correct software calibration for your vehicle’s specific engine, transmission, and options. This ensures perfect compatibility and function right out of the box.
Is this part difficult to install?
For most individuals with basic mechanical skills, this is a straightforward replacement. The main challenge is accessing the module’s location. Our pre-programming saves you the most complex step, which is the software flashing.
Will this fix my check engine light?
If the check engine light is caused by a faulty PCM or an issue that the latest GM software update addresses, then yes, this will resolve it. It is crucial to ensure your vehicle’s underlying mechanical or sensor issues have been fixed first.
Do I need any special tools?
Typically, you will only need basic hand tools like a socket set to remove the module’s mounting bolts. No programming or special diagnostic tools are required from you.
How do I find my original part or service number?
The service number is printed on a sticker on your original module. You can cross-reference it with the compatible numbers listed above to confirm a match.