Is Your 1998 Pontiac Bonneville Acting Up?
If you’re dealing with frustrating issues like a persistent Check Engine Light, erratic transmission shifting, a no-start condition, or unexplained stalling, the heart of the problem is likely your Powertrain Control Module (PCM). In my 20+ years as a technician, I’ve seen these specific GM modules fail in predictable ways. The electronics from this era are prone to failure from decades of heat cycles and engine vibration, causing internal connections to break down and corrupt the software.
The Common Symptoms of a Failing GM PCM
A faulty PCM doesn’t just fail all at once; it often dies a slow death, creating a list of confusing problems that can lead to expensive, incorrect repairs. You might be experiencing:
- ✔ Unpredictable or harsh automatic transmission shifts.
- ✔ The engine cranks but refuses to start.
- ✔ A Check Engine Light with communication error codes (U-codes) or false sensor codes.
- ✔ Poor fuel economy and a general lack of power.
- ✔ The vehicle stalls for no reason, either at idle or while driving.
Many owners and even some shops will start replacing sensors, spark plugs, or fuel pumps, only to find the problem remains. The real issue is the central computer that’s giving out bad commands.
Expert Pro Tip: Check Your Grounds First!
Before you condemn your PCM, do yourself a favor and check the main engine and chassis ground connections. On these late-90s GM vehicles, a corroded or loose ground strap can mimic PCM failure by causing voltage drops and communication errors. A few minutes with a wire brush can sometimes save you a lot of headache. If the grounds are clean and tight and the problems persist, the PCM is your next logical step.
The Right Solution: A Plug-and-Play Programmed PCM
Simply buying a used module from a junkyard won’t work. These PCMs are VIN-specific and tied to the vehicle’s anti-theft system (VATS). This unit solves that problem entirely. We take your vehicle’s 17-digit VIN and professionally flash this module with the latest, most stable software updates directly from GM. This isn’t just a data transfer; it’s a complete programming that ensures the module is a perfect match for your car’s specific configuration.
What This Means For You:
- ✔ No Dealer Visit Required: This module arrives ready to install. No need for expensive programming appointments.
- ✔ Restored Performance: Corrects shifting, starting, and fuel delivery issues by restoring proper computer control.
- ✔ Reliable and Tested: Each module is thoroughly inspected and programmed to ensure it functions correctly.
- ✔ Simple Installation: In most cases, you’ll simply disconnect the battery, swap the module, and perform a straightforward security relearn procedure (instructions widely available online).
Guaranteed Compatibility
This Powertrain Control Module is a direct replacement for units with service numbers 09356741, 16236757, 9356741, 9357034, 9357440, and 9366314. It is confirmed to fit the following vehicles:
- ✔ 1998-1999 Oldsmobile Cutlass
- ✔ 1998-1999 Pontiac Grand Am (3.1L & 3.4L)
- ✔ 1998 Buick LeSabre & Park Avenue (3.8L)
- ✔ 1998 Chevrolet Venture & Pontiac Trans Sport (3.4L)
- ✔ 1999 Oldsmobile Alero (3.4L)
- ✔ 1998 Buick Riviera (3.8L)
- ✔ 1998 Buick Century & Skylark (3.1L)
- ✔ 1998 Pontiac Grand Prix
- ✔ 1998 Oldsmobile Achieva (3.1L)
- ✔ 1998 Oldsmobile Eighty Eight & Intrigue
- ✔ 1998 Chevrolet Lumina & Monte Carlo
- ✔ 1998 Oldsmobile Silhouette
- ✔ 1998 Chevrolet Camaro & Pontiac Firebird (3.8L)
- ✔ 1998 Pontiac Bonneville
- ✔ 1998 Buick Regal
IMPORTANT: After your purchase, please send us your vehicle’s VIN. We cannot ship your part until we have this information to complete the required programming.