Is Your GM Vehicle Running Rough, Stalling, or Refusing to Start?
If you’re dealing with frustrating engine problems on your 2003-2005 Pontiac Aztek or another compatible GM vehicle, the root cause is often the very component that’s supposed to be in charge: the Powertrain Control Module (PCM), also known as the Electronic Control Module (ECM). Over my 20+ years turning wrenches, I’ve seen hundreds of these modules fail. The symptoms can be maddeningly inconsistent, making diagnosis a real headache for the average DIYer and even some shops.
Common Symptoms of a Failing GM PCM
A faulty PCM can manifest in numerous ways because it controls everything from fuel injection and spark timing to transmission shift points. If your vehicle is experiencing any of the following, its electronic brain might be the culprit:
- โ Check Engine Light is on with seemingly random communication codes (like U-codes).
- โ The engine cranks but refuses to start, or starts and immediately stalls.
- โ Harsh, erratic, or delayed automatic transmission shifting.
- โ A noticeable drop in fuel economy for no apparent reason.
- โ The engine misfires, stumbles, or hesitates during acceleration.
- โ Your scan tool cannot communicate with the PCM at all.
From the Shop Floor: A Real-World Diagnostic Story
“A customer’s 2004 Pontiac Grand Am came in on a tow truck last month with these exact symptoms. It had a crank/no-start condition that had already stumped two other mechanics. They had replaced the fuel pump and crank sensor, but nothing worked. My first step was to connect my professional scan tool, which immediately reported ‘No Communication with PCM.’ After verifying the module had proper power and groundโa critical stepโI knew the internal circuitry of the original PCM was fried. We ordered this exact pre-programmed module, provided the customer’s VIN, and it arrived ready to install. After a simple 15-minute swap and a security relearn procedure, the car fired up on the first try and ran perfectly. The customer saved hundreds compared to a dealership visit.”
The Direct-Fit, Pre-Programmed Solution
This isn’t just a replacement part; it’s a complete solution. This Powertrain Control Module (part number 89017735) is meticulously tested and prepared to restore your vehicle’s factory performance. The most significant benefit is our professional programming service, included with your purchase.
How It Works:
- Place Your Order: Purchase this PCM for your compatible vehicle.
- Provide Your VIN: After checkout, simply send us your vehicle’s 17-digit Vehicle Identification Number (VIN).
- We Do the Work: Our technicians use your VIN to flash the module with the latest, most stable software updates directly from GM. This ensures perfect compatibility and addresses many drivability issues that older software versions had.
- Install and Drive: The module arrives at your door, ready for installation. In most cases, this is a straightforward plug-and-play process, eliminating the need for an expensive trip to the dealer for programming.
Guaranteed Compatibility
This module is a direct replacement for original equipment part numbers 12583827 and 12583826. It is guaranteed to fit and function correctly on the following vehicles. Please verify your model and year before ordering.
- โ Pontiac Aztek: 2003-2005 (LH engine compartment)
- โ Buick Century: 2003-2005 (LH engine compartment)
- โ Buick LeSabre: 2004-2005 (LH engine compartment)
- โ Buick Park Avenue: 2004-2005 (LH front engine compartment)
- โ Buick Rendezvous: 2003-2005 (LH engine compartment)
- โ Chevrolet Impala: 2003-2005
- โ Chevrolet Malibu: 2003 (LH dash)
- โ Chevrolet Monte Carlo: 2003-2005
- โ Chevrolet Venture: 2003-2005 (LH engine compartment)
- โ Oldsmobile Alero: 2003-2004 (3.4L, LH center dash)
- โ Oldsmobile Silhouette: 2003-2004 (LH engine compartment)
- โ Pontiac Bonneville: 2004-2005 (3.8L, LH engine compartment)
- โ Pontiac Grand Am: 2003-2005 (3.4L, LH center dash)
- โ Pontiac Grand Prix: 2003 (3.1L, LH front engine compartment)
- โ Pontiac Montana: 2003-2005 (LH engine compartment)
Don’t let a faulty PCM keep you off the road. Order this professionally programmed module and restore the reliability and performance of your vehicle with confidence.