Is Your GM Vehicle Running Erratically? The PCM Could Be the Culprit.
If your 2004-2005 Pontiac Bonneville, or another GM vehicle from that era, is suddenly experiencing a host of baffling issues, you’re not alone. I’ve seen it hundreds of times in my 20+ years as a technician. Symptoms like unexplained stalling, a hard no-start condition where the engine just cranks, harsh or delayed transmission shifts, or a check engine light that won’t go away can often be traced back to one single component: a failing Powertrain Control Module (PCM).
The PCM is the brain of your vehicle’s engine and transmission. It processes data from dozens of sensors to manage everything from fuel injection and ignition timing to transmission shift points and emissions controls. Over time, heat cycles, vibration, and age can cause internal circuits and processors to fail, leading to the unpredictable and frustrating problems you’re likely facing right now.
The Dealership-Free Solution: A Pre-Programmed PCM
In the past, replacing a PCM was a major headache. You’d buy the part, install it, and then have to get your vehicle towed to a dealership for expensive programming. We’ve eliminated that step. This replacement PCM, part number 89017735, is the direct, hassle-free solution to get your vehicle running properly again.
Hereโs how we make it simple:
- โ Programmed to Your Vehicle: When you order, you provide us with your vehicle’s VIN. We then flash this module with the latest, most stable software updates directly from GM. This ensures it’s a perfect match for your car’s specific configuration.
- โ Ready for Installation: Because the programming is done before we ship, the module arrives at your door ready to be installed. In most cases, this is a straightforward plug-and-play process.
- โ Resolves Common Failures: A new, correctly programmed PCM is the definitive fix for issues caused by a faulty original unit, restoring communication between your vehicle’s critical systems.
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. Over my career, I’ve seen countless vehicles towed in with a ‘bad PCM’ diagnosis that was actually just a loose or corroded ground strap under the hood. A poor ground can cause voltage drops and communication errors that perfectly mimic PCM failure. A few minutes with a wrench cleaning the battery-to-chassis and engine-to-chassis grounds can save you a lot of time and money. If the grounds are clean and tight and the problems persist, then the PCM is your most likely suspect.
Guaranteed Compatibility
This module is a direct replacement for original equipment part numbers 12583827 and 12583826. It is guaranteed to fit and function correctly in the following vehicles. Please verify your model and options to ensure a perfect match.
This part will fit these makes and models with these options:
- โ Alero: 2003 (3.4L, ID 12583827), 2004 (3.4L)
- โ Aztek: 2003 (ID 12583827), 2004-2005
- โ Bonneville: 2004-2005 (3.8L)
- โ Century: 2003-2005
- โ Grand Am: 2003 (3.4L, ID 12583827), 2004-2005 (3.4L)
- โ Grand Prix: 2003 (3.1L, ID 12583827)
- โ Impala: 2003 (3.4L, ID 12583827), 2004-2005
- โ LeSabre: 2004-2005
- โ Malibu: 2003 (ID 12583827)
- โ Monte Carlo: 2003 (3.4L, ID 12583827), 2004-2005
- โ Montana: 2003-2004, 2005 (Base)
- โ Park Avenue: 2004 (ID 12583827), 2005
- โ Rendezvous: 2003-2005 (ID 12583827)
- โ Silhouette: 2003-2004
- โ Venture: 2003 (ID 12583827), 2004-2005
Don’t let a faulty computer keep your car off the road. Order this pre-programmed PCM today and restore the reliability and performance you depend on.