Programmed 1998 Bonneville PCM 9357440 | VIN Matched | GM Engine Computer

Restore Your GM’s Performance and Reliability

If you’re dealing with a frustrating check engine light, poor fuel economy, erratic shifting, or a no-start condition in your 1998 Pontiac Bonneville, a failing Powertrain Control Module (PCM) is often the culprit. As the central computer for your engine and transmission, its proper function is critical. I’ve seen countless vehicles in my shop with these exact symptoms, and replacing a faulty PCM is the definitive solution. This isn’t just a replacement part; it’s a direct-fit, VIN-programmed module that restores your vehicle’s factory performance and communication protocols.

We take the guesswork and high cost out of the equation. Forget expensive dealership visits for programming. Simply provide us with your vehicle’s VIN during checkout, and our technicians will flash this module with the latest GM-certified software specifically for your car. This ensures seamless integration, correct engine parameters, and proper transmission control right out of the box. This is the most efficient way to get your car back to running smoothly and reliably.

Is Your Vehicle Showing These Symptoms?

A failing PCM can cause a wide range of issues. If you’re experiencing any of the following, this module is the likely solution.

• ✔ Check Engine Light is illuminated with codes like P0601, P0602, P0605, or P0606 (Internal Control Module Errors).
• ✔ The engine cranks but refuses to start.
• ✔ Unexplained drop in fuel mileage.
• ✔ Harsh or erratic automatic transmission shifting.
• ✔ Stalling, rough idling, or hesitation during acceleration.
• ✔ Failure to pass an emissions/smog test.

A Straightforward Guide to Installation

Installing your new 1998 Bonneville PCM is a job most DIYers can handle in under an hour with basic hand tools. Following these steps will ensure a smooth process.

1. Safety First: Disconnect the negative terminal from your vehicle’s battery to prevent any electrical shorts.
2. Locate the PCM: On most of these vehicles, the PCM is located in the engine bay, often inside the air filter box assembly for protection. Consult a repair manual for your specific model if you’re unsure.
3. Disconnect the Harnesses: Carefully unclip the electrical wiring harnesses connected to the old module. These clips can be brittle, so apply steady, even pressure.
4. Remove the Old Module: Unbolt the old PCM from its mounting bracket and remove it from the vehicle.
5. Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and securely reconnect the wiring harnesses. You should hear a ‘click’ as they lock into place.
6. Reconnect the Battery: Re-attach the negative battery terminal.
7. Perform Security Relearn: Most GM vehicles of this era require a simple key-cycle security relearn procedure. Turn the key to the ‘ON’ position (without starting) for 10-15 minutes, then ‘OFF’ for 10 seconds. Repeat this two more times. On the fourth cycle, the vehicle should start and run normally.

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:

• ✔ 1999 Alero (3.4L, check ID)
• ✔ 1998 Achieva (3.1L)
• ✔ 1998 Bonneville
• ✔ 1998 Camaro (3.8L)
• ✔ 1998 Century (3.1L)
• ✔ 1998-1999 Cutlass (check ID for ’99)
• ✔ 1998 Eighty Eight
• ✔ 1998 Firebird (3.8L)
• ✔ 1998-1999 Grand Am (check engine/ID for ’99)
• ✔ 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)

With a pre-programmed 1998 Bonneville PCM, you’re not just buying a part; you’re buying a complete, ready-to-install solution that restores your vehicle’s core functionality.