Is Your GM Truck or SUV Acting Up?
If you’re dealing with a persistent Check Engine Light, erratic shifting, a rough idle, or even a no-start condition, the problem often points directly to a failing Powertrain Control Module (PCM). As the central computer for your engine and transmission, when the PCM starts to go, it can cause a host of frustrating and hard-to-diagnose issues. I’ve seen it countless times in my shop: a 2005 Silverado 2500 with the 6.0L comes in stalling at stoplights and throwing random communication codes. The owner has replaced sensors and checked wiring, but the root cause is a faulty PCM.
The Direct-Fit Solution for Your Vehicle
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We take the guesswork and the expensive trip to the dealership out of the equation. By providing us with your vehicle’s VIN at checkout, you receive a PCM that is professionally programmed with the latest GM factory software updates specific to your truck. This ensures seamless communication with your vehicle’s other modules, correct engine performance, and proper transmission shift points right out of the box.
Symptoms of a Failing GM PCM
A faulty PCM can manifest in many ways. If you’re experiencing any of the following, it’s a strong indicator that your engine computer needs attention:
- โ Persistent Check Engine Light (CEL) with various codes
- โ Engine stalling, stumbling, or misfiring
- โ Harsh or delayed automatic transmission shifting
- โ Poor fuel economy
- โ Complete no-start or no-spark condition
- โ Communication errors with diagnostic scan tools
Expert Pro Tip from a 20-Year Technician
Before you install your new PCM, take five minutes to inspect and clean the main engine-to-chassis ground strap. On these GM trucks, it’s often located on the passenger side, running from the back of the cylinder head to the firewall. Corrosion or a loose connection here creates electrical resistance that can mimic PCM failure and, in worst-case scenarios, damage the replacement module. A quick cleaning with a wire brush can save you a major headache.
Easy Installation for Your 2003-2007 Sierra 3500 PCM
You don’t need to be a master mechanic to get your truck back on the road. This module is designed for a straightforward swap. On most compatible models like the Sierra, Silverado, and Tahoe, the PCM is located in the engine bay on the driver’s side, near the battery and air filter box.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery.
- Locate the PCM: Find the module, typically mounted to a bracket near the battery.
- Disconnect the Connectors: Carefully unclip the wiring harness connectors. These have locking tabs, so be gentle. Inspect the pins for any green or white corrosion.
- Remove the Old Module: Unbolt the PCM from its mounting bracket.
- Install the New PCM: Mount your new, pre-programmed module in place and securely reconnect the wiring harnesses.
- Reconnect the Battery: Reattach the negative battery terminal. Your vehicle is now ready to start. In most cases, no further procedures are needed.
Guaranteed Compatibility
This module is a direct replacement for a wide range of GM trucks and SUVs from 2003 to 2007. It is compatible with service numbers 89017750, 12582605, 12589463, 12602802, 89017734, and 28042802. Please verify your part number and consult the detailed fitment list to ensure this is the correct component for your vehicle. Our VIN-programming service provides the final layer of certainty, ensuring it works perfectly for your specific configuration.