Restore Your GM Vehicle’s Performance and Reliability
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 vehicle, a failing Powertrain Control Module (PCM) is a very likely culprit. As the ‘brain’ of your vehicle’s engine and transmission, when the PCM starts to fail, it can cause a cascade of confusing and intermittent problems. I’ve seen it hundreds of times in the shop: owners spend a fortune chasing sensors and wiring issues when the root cause was the central computer all along.
This isn’t just a replacement part; it’s a complete solution. We take the guesswork and high dealership costs out of the equation. This PCM, part number 9357034, is professionally programmed with the latest GM software updates specifically for your vehicle. All we need is your Vehicle Identification Number (VIN) during checkout. This ensures that when the module arrives, it’s ready for a straightforward installation, restoring factory performance, fuel economy, and transmission shifting patterns.
A Technician’s Notebook: The Grand Am That Wouldn’t Cooperate
A few years back, a ’99 Pontiac Grand Am with the 3.4L V6 came into my bay on a tow truck. The owner was at his wit’s end. It would start and run fine for days, then suddenly refuse to start. No spark, no fuel injector pulse. He had already replaced the crank sensor and ignition module. After checking all the power and ground circuits to the PCM—which were solid—I suspected the module itself. We installed one of our VIN-programmed units, and the car fired up instantly. The intermittent failure was internal to the old PCM, a common issue with these units as they age. He drove it for another 60,000 miles without a single hiccup. It’s a powerful reminder that sometimes the most complex problems have the simplest solutions.
Common Signs of a Failing PCM
If your vehicle is experiencing any of the following, a faulty PCM could be the reason. Replacing your 1999 Alero Powertrain Control Module can be the definitive fix.
- âś” Check Engine Light is on with codes related to internal module failure (e.g., P0601, P0606).
- âś” The engine cranks but refuses to start.
- âś” Unexplained stalling or rough idling.
- âś” A noticeable drop in fuel efficiency.
- âś” Harsh or erratic automatic transmission shifting.
- âś” Failure to pass an emissions inspection.
- âś” Communication errors with diagnostic scan tools.
A Straightforward Guide to Installation
Installing your new PCM is a manageable job for a confident DIYer. By having us program the module beforehand, you skip the most difficult and expensive step. Always consult a repair manual for your specific vehicle’s procedures and torque specs.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and wait at least 15 minutes to ensure all systems are de-energized.
- Locate the PCM: On most of these vehicles, such as the Alero and Grand Am, the PCM is located in the center of the dashboard, accessible from below. On vans like the Venture or Silhouette, it’s often in the engine compartment.
- Disconnect Connectors: Carefully unlatch and remove the electrical wiring harness connectors from the old module. Inspect them for any corrosion or damage.
- Remove the Old Module: Unbolt the mounting hardware holding the PCM in place and carefully remove it from the vehicle.
- Install the New Module: Mount your new, pre-programmed PCM in the same location and secure it with the original hardware.
- Reconnect Everything: Firmly re-seat the wiring harness connectors until they click into place. Reconnect the negative battery terminal.
- Perform Security Relearn (If Necessary): Some GM vehicles require a simple key-cycle security relearn procedure. This typically involves turning the key to ‘ON’ for 10-15 minutes, then ‘OFF’, and repeating two more times. Your vehicle’s manual will have the exact steps.
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 models with the specified options. This is a comprehensive solution for your 1999 Alero Powertrain Control Module needs and many other GM cars.
- ACHIEVA 98 (6-191, 3.1L)
- ALERO 99 (3.4L, ID 16236757, 9356741, 9357034, 9357440)
- BONNEVILLE 98
- CAMARO 98 (6-231, 3.8L)
- CENTURY 98 (6-191, 3.1L)
- CUTLASS 98
- CUTLASS 99 (ID 16236757)
- EIGHTY EIGHT 98
- FIREBIRD 98 (6-231, 3.8L)
- GRAND AM 98 (6-191, 3.1L)
- GRAND AM 99 (3.4L, ID 16236757, 9356741, 9366314, 9357034, 9347440)
- GRAND PRIX 98
- INTRIGUE 98
- LESABRE 98 (6-231, 3.8L)
- LUMINA CAR 98
- MALIBU 98 (6-191, 3.1L)
- MONTE CARLO 98
- PARK AVENUE 98 (6-231, 3.8L)
- REGAL 98
- RIVIERA 98 (6-231, 3.8L)
- SILHOUETTE 98
- SKYLARK 98 (6-191, 3.1L)
- TRANS SPORT 98
- VENTURE 98 (6-207, 3.4L)
Frequently Asked Questions
What is VIN programming and why is it required?
VIN programming loads your vehicle’s specific software, including engine and transmission calibrations and anti-theft settings, onto the module. It ensures the PCM works perfectly with your car’s options right out of the box, preventing compatibility issues.
Is this part difficult to install myself?
For most DIYers with basic tools, this is a very manageable repair. Since we handle the programming, the physical swap is straightforward. The most common locations are under the dash or in the engine bay.
Will this fix my check engine light?
If the check engine light is caused by an internal PCM fault (like code P0601), then yes, this will resolve the issue. However, you should always diagnose other codes to ensure there aren’t separate sensor or wiring problems.
How do I provide my VIN?
After you complete your purchase, you will receive instructions on how to send us your 17-digit VIN. We cannot ship the module until we receive this information, as the programming is essential for it to function in your vehicle.
Is this a new or used part?
This is a high-quality, inspected, and tested replacement part that has been verified to meet or exceed original equipment performance. It is programmed with the latest software from GM for optimal function.