Is Your 1998 Skylark Running Rough? The PCM Might Be the Culprit.
The Powertrain Control Module, or PCM, is the central computer of your 1998 Buick Skylark. It’s responsible for managing everything from fuel injection and ignition timing to transmission shifting and emissions control. When this critical component begins to fail, it can cause a wide range of frustrating and often difficult-to-diagnose problems. From a simple check engine light to a no-start condition, a faulty PCM can leave you stranded. This replacement module, part number 16236757, is the definitive solution to restore your vehicle’s performance, reliability, and efficiency.
Unlike generic modules from a local parts store, this unit is delivered to you fully programmed to your vehicle’s specific Vehicle Identification Number (VIN). We install the latest GM-certified software updates, which can resolve factory-known issues and improve overall powertrain operation. This means no expensive trips to the dealership for programming—it’s a true plug-and-play solution designed to get you back on the road quickly and affordably.
From the Diagnostic Bay
We had a 1998 Grand Am come into the shop with a persistent misfire on cylinder 3. The owner had already replaced the spark plug, wire, and ignition coil, but the problem remained. Diagnostic scans showed an intermittent injector driver fault. After checking the wiring harness for continuity and finding no issues, we suspected the PCM. We swapped in a known-good, programmed module, and the misfire vanished instantly. The original PCM’s internal driver for that injector had failed. It’s a classic example of how a failing computer can mimic a mechanical or electrical part failure, leading to wasted time and money on unnecessary parts.
Common Symptoms of a Failing 1998 Skylark PCM
- ✔ Check Engine Light (CEL) is illuminated with various trouble codes.
- ✔ Engine stalling, stumbling, or hesitating during acceleration.
- ✔ Rough or erratic idling.
- ✔ Harsh or delayed automatic transmission shifting.
- ✔ A significant, unexplained drop in fuel economy.
- ✔ The engine cranks but refuses to start (no-start condition).
- ✔ Communication errors with diagnostic scan tools.
- ✔ Failure to pass state emissions testing.
The Importance of VIN-Specific Programming
Your vehicle’s VIN is more than just a serial number; it’s a blueprint that details its specific engine, transmission, emissions equipment, and other factory-installed options. Programming this 1998 Skylark PCM with your VIN ensures that all parameters are set correctly for your exact build. This process is critical for proper engine performance, transmission function, and anti-theft system operation. By providing us with your VIN at checkout, you guarantee a seamless installation and optimal performance right out of the box.
Broad Compatibility Across the GM Lineup
This versatile module, identified by service number 16236757, is also a direct replacement for several other part numbers, including 09356741, 9357034, 9357440, and 9366314. It fits a wide array of GM vehicles from the late 90s. Please verify your part number and check the comprehensive fitment list below to ensure compatibility:
- 1998-1999 Oldsmobile Cutlass
- 1998-1999 Pontiac Grand Am (3.1L, 3.4L)
- 1998 Buick LeSabre (3.8L)
- 1998 Buick Park Avenue (3.8L)
- 1998 Chevrolet Venture (3.4L)
- 1999 Oldsmobile Alero (3.4L)
- 1998 Buick Riviera (3.8L)
- 1998 Buick Century (3.1L)
- 1998 Buick Skylark (3.1L)
- 1998 Pontiac Grand Prix
- 1998 Oldsmobile Achieva (3.1L)
- 1998 Oldsmobile Eighty Eight
- 1998 Oldsmobile Silhouette
- 1998 Pontiac Firebird (3.8L)
- 1998 Chevrolet Malibu (3.1L)
- 1998 Oldsmobile Intrigue
- 1998 Chevrolet Lumina
- 1998 Pontiac Bonneville
- 1998 Chevrolet Camaro (3.8L)
- 1998 Chevrolet Monte Carlo
- 1998 Buick Regal
- 1998 Pontiac Trans Sport
Frequently Asked Questions
Do I need to do any programming myself?
No. This module comes fully programmed to your vehicle’s VIN. It is ready for installation upon arrival. You will not need to take it to a dealership or mechanic for additional programming.
Where do I provide my VIN?
After you complete your purchase, you will need to send us your 17-digit VIN. You can typically add it as a note during checkout or reply to your order confirmation email with the information. We cannot ship the part until we receive your VIN.
Is any other procedure required after installation?
In some GM vehicles of this era, a security relearn procedure (often called a VATS relearn) may be necessary to allow the vehicle to start. This is a simple procedure that typically involves turning the key to the ‘ON’ position for 10-15 minutes and can be done without any special tools. Instructions are readily available online for your specific model.
How can I be sure this part will fit my vehicle?
The best way to ensure compatibility is to match the service number from your original module to one of the numbers listed (16236757, 09356741, etc.). You can also use the fitment list provided on this page. If you are still unsure, please contact us with your VIN before ordering.
What is the difference between a PCM and an ECM?
The terms are often used interchangeably. ECM stands for Engine Control Module, while PCM stands for Powertrain Control Module. A PCM controls both the engine and the transmission, while an ECM typically controls only the engine. For your 1998 Skylark, this unit functions as the PCM.