Is Your GM Truck or SUV Acting Up?
If you’re dealing with a persistent Check Engine Light, erratic shifting, a no-start condition, or just poor engine performance in your 2003-2006 Yukon, Tahoe, Silverado, or other compatible GM vehicle, 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 fail, it can cause a host of frustrating and difficult-to-diagnose issues. I’ve seen it hundreds of times in my shop: perfectly good mechanical parts get replaced while the real culprit, the PCM, is overlooked.
The Dealership-Free Solution You Need
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We take a reliable, tested PCM, part number 12602802, and professionally program it to your vehicle’s specific 17-digit Vehicle Identification Number (VIN). This process ensures the module has the latest GM factory software updates, which often correct drivability issues the original software had. The result is a true plug-and-play module that restores your vehicle’s performance without requiring a costly trip to the dealership for programming.
Expert Pro Tip: Check Your Grounds Before Condemning a PCM
Before you swap the module, take 10 minutes to inspect and clean the main engine-to-chassis and battery ground connections. On these GM trucks, they are notorious for corroding. A poor ground can mimic PCM failure by causing voltage drops and communication errors. A customer’s ’05 Tahoe came in last week with a P0601 (Internal Control Module Memory Check Sum Error) code that wouldn’t clear. We found a corroded ground strap near the firewall. Cleaning it fixed the issue, but more often than not, that code means the PCM itself is the problem.
Common Symptoms of a Failing GM PCM:
- โ Unexplained Check Engine Light (especially with communication codes like U-codes or internal processor codes like P0601-P0606)
- โ Vehicle won’t start or starts and immediately stalls
- โ Harsh or erratic automatic transmission shifting
- โ Reduced fuel economy and poor engine power
- โ Communication loss with your scan tool
- โ Intermittent issues that get worse as the engine warms up
Guaranteed Compatibility for Your 2003-2006 Yukon PCM
This module is a direct replacement for service part number 12602802 and is also interchangeable with several other common service numbers, including 89017750, 12582605, 12589463, 89017734, and 28042802. It fits a massive range of GM trucks and SUVs, including the Silverado, Sierra, Suburban, Avalanche, Escalade, and Hummer H2. By providing your VIN, you guarantee we send a module that is 100% correct for your vehicle’s specific configuration.
Simple, Straightforward Installation
You don’t need to be a master mechanic to install this part. On most of these trucks, the PCM is located in the engine bay on the driver’s side, near the battery and airbox.
- Safety First: Disconnect the negative battery terminal and wait 10 minutes for the system capacitors to discharge.
- Locate the PCM: Find the module, typically mounted to a bracket on the driver’s side fender well.
- Disconnect Connectors: Carefully unclip the wire harness connectors. These have locking tabs, so don’t force them. Note their color or position.
- Remove the Old Module: Unbolt the PCM from its mounting bracket.
- Install the New Module: Bolt your new, pre-programmed PCM into place and securely reconnect the wire harnesses.
- Reconnect Battery: Re-attach the negative battery terminal. The vehicle may need to run for a few minutes for the idle to stabilize. No further programming is required.