Is Your GM Truck or SUV Running Rough?
The Powertrain Control Module, or PCM, is the central computer of your vehicle, responsible for managing everything from fuel injection and spark timing to transmission shifting and emissions control. When it begins to fail, it can cause a cascade of frustrating and difficult-to-diagnose problems. If your Chevrolet SSR, Silverado, Tahoe, Hummer H2, or another compatible GM vehicle is experiencing unexplained performance issues, a failing PCM is a very likely culprit. This replacement module, part number 89017734, is the definitive solution to restore your vehicle’s factory performance and reliability.
From the Diagnostic Bay
We had a 2005 Silverado 2500 come into the shop with a problem that had stumped two other mechanics. The owner complained of random stalling at stoplights and harsh, unpredictable transmission shifts. There were no consistent trouble codes, just a generic communication error that would pop up occasionally. We checked the wiring, sensors, and even the fuel pump, but everything seemed fine. On a hunch, we swapped in a known-good PCM. The truck immediately ran perfectly. The original module had an internal fault that would only manifest under specific thermal conditions, making it nearly impossible to track down. This pre-programmed replacement would have saved the owner hundreds of dollars in diagnostic fees and weeks of frustration.
Symptoms of a Failing Powertrain Control Module
- ✔ Check Engine Light is on with various or no specific codes.
- ✔ Engine stalling, stumbling, or misfiring for no apparent reason.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Noticeable decrease in fuel economy.
- ✔ The vehicle fails to start, even with a good battery and starter.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Failure to pass state emissions testing.
The Simple, Reliable Solution: A VIN-Programmed 2003 SSR PCM
Don’t let a faulty computer keep your truck off the road. This isn’t just a generic, off-the-shelf part. We take the hassle and guesswork out of the repair by programming this module specifically for your vehicle using your VIN. This ensures that it has the latest software updates from General Motors and is calibrated to the exact specifications of your truck’s engine, transmission, and options package. The process is simple: you place your order, provide us with your VIN, and we ship you a module that is ready for installation. This direct-fit replacement for service number 89017734 and others listed in the fitment guide is the most efficient way to get your vehicle running right again.
Installation and Setup
Replacing the PCM is a straightforward process for a DIY mechanic or any professional technician. It is typically located in the engine bay, often on the driver’s side near the battery or airbox. After physically swapping the module, you may need to perform a security relearn procedure, also known as a CASE (Crankshaft Angle Sensor Error) relearn. This procedure syncs the new PCM with your vehicle’s anti-theft system and crankshaft position sensor. This can often be done without special tools and instructions are widely available online for your specific model.
Frequently Asked Questions
What exactly does a PCM do?
The Powertrain Control Module (PCM) is your vehicle’s main computer. It takes data from sensors all over the engine and transmission to control fuel delivery, spark timing, transmission shift points, and emissions systems for optimal performance and efficiency.
How do I provide my vehicle’s VIN?
After you complete your purchase, you can add your VIN to the order notes or simply reply to your order confirmation email. We will not ship the part until we have your VIN to ensure correct programming.
Will I need to do anything after installing this module?
In most cases, you will need to perform a security relearn procedure (often called a CASE relearn) to sync the new module with your vehicle’s anti-theft and engine sensors. This is a standard procedure for this type of repair.
Is this part compatible with other service numbers?
Yes, this module is a direct replacement for several service numbers, including 89017750, 12582605, 12589463, 12602802, and 28042802. Please verify your original part number or consult our fitment list.
What happens if I ignore a failing PCM?
Continuing to drive with a faulty PCM can lead to worsening performance, poor fuel economy, potential damage to the catalytic converter, and eventually a no-start condition, leaving you stranded.