Restore Peak Performance and Reliability to Your GM Vehicle
If you’re dealing with frustrating issues like a persistent Check Engine Light, erratic engine behavior, stalling, or poor fuel economy, the problem often points directly to a failing Powertrain Control Module (PCM). As a technician with over two decades of experience under the hood, I’ve seen firsthand how a faulty PCM can cause a host of mysterious problems that are difficult to diagnose. This isn’t just a part; it’s the central computer for your engine and transmission, and when it fails, your vehicle’s performance and reliability suffer.
This replacement PCM, part number 9357440, is the definitive solution for a wide range of popular 1998 and 1999 GM vehicles. The biggest hurdle in replacing a PCM is typically the expensive programming required at a dealership. We eliminate that step entirely. Before we ship this module to you, our experts will flash it with the latest official GM software, specifically calibrated to your vehicle’s unique Vehicle Identification Number (VIN). This ensures seamless communication between all your vehicle’s systems, restoring the smooth operation and efficiency 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 been to two other places trying to solve an intermittent no-start and a random stalling problem that never set a consistent trouble code. We checked fuel pressure, ignition components, and sensors—all were fine. On a hunch, I monitored the PCM data stream during a test drive. I noticed the processor would occasionally reset itself for a split second, just long enough to cause a stall but not always long enough to log a hard fault. We replaced the PCM with a pre-programmed unit like this one, and the problem was solved instantly. It saved the customer hundreds in further diagnostic fees and finally gave them a reliable car again.
Is Your GM Vehicle Showing These Symptoms?
A failing PCM can manifest in many ways. If you’re experiencing any of the following, this module is likely the solution you need. Look out for common Diagnostic Trouble Codes (DTCs) like P0601 (Internal Control Module Memory Check Sum Error) or other P06xx codes.
- ✔ Unexplained Check Engine Light illumination
- ✔ Engine stalling or cutting out while driving
- ✔ Rough or inconsistent idling
- ✔ Harsh or erratic automatic transmission shifting
- ✔ A noticeable drop in fuel economy
- ✔ Failure to pass an emissions or smog test
- ✔ Complete no-start condition where the engine cranks but won’t fire
A Straightforward Guide to Installation
Installing your new, pre-programmed 1998 Skylark Powertrain Control Module is a manageable job for a confident DIYer. The key is taking your time and following the proper procedure. While locations vary slightly by model (e.g., under the hood in a Lumina, behind the dash in a Grand Am), the general steps are similar.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent any accidental reconnection.
- Locate the PCM: Find the existing PCM. On many of these vehicles, it’s located in the engine bay, often inside the air filter housing, or under the passenger side of the dashboard.
- Disconnect Connectors: Carefully unlatch and remove the electrical wiring harness connectors from the old module. Inspect the connectors for any corrosion or damage and clean them if necessary.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket.
- Install the New Module: Mount the new PCM securely in place and reconnect the wiring harnesses. Ensure they click into place firmly.
- Reconnect Battery: Reattach the negative battery terminal.
- Perform Security Relearn (If Necessary): For many GM vehicles of this era, you will need to perform a simple security relearn procedure. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’ for 10 seconds, and repeating this cycle three times. This allows the new PCM to synchronize with your vehicle’s anti-theft system. Your car will not start until this is completed.
Verified Vehicle Compatibility
This module is a direct replacement for service numbers 09356741, 16236757, 9357034, 9357440, and 9366314. It is guaranteed to fit the following models. Please provide your VIN to ensure we program it correctly for your specific vehicle and options.
ALERO 99 (3.4L, ID 16236757, 9356741, 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 (LH engine compartment)
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 (LH engine compartment)
SKYLARK 98 (6-191, 3.1L)
TRANS SPORT 98 (LH engine compartment)
VENTURE 98 (6-207, 3.4L)
Frequently Asked Questions about the 1998 Skylark Powertrain Control Module
Do I need to do any programming myself?
Do I need to do any programming myself?
No. We handle all the programming for you before shipment. Simply provide your vehicle’s VIN during checkout, and the module will arrive ready for installation with the latest GM software updates for your specific vehicle.
What is the security relearn procedure?
It’s a simple, key-on/key-off process that syncs the new PCM with your car’s anti-theft system. It takes about 30 minutes and requires no special tools. We include detailed instructions, but it’s generally a 3-cycle process of turning the key to ‘ON’ for 10 minutes and ‘OFF’ for 10 seconds.
Is this part compatible with other service numbers?
Yes, this PCM is a direct replacement for several service numbers, including 09356741, 16236757, 9357034, 9357440, and 9366314. As long as your vehicle is on our compatibility list, this module will work for you.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls both engine and transmission functions. If the module is failing, it can send incorrect signals to the transmission, causing harsh or delayed shifts. A properly functioning PCM is critical for smooth transmission operation.