Is Your Escalade, Tahoe, or Sierra Running Rough?
If your 2003-2006 GM truck or SUV is suddenly stalling, shifting erratically, or showing a persistent check engine light with a host of confusing codes, 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 frustrating and unpredictable issues that can leave you stranded. Don’t let a faulty computer sideline your vehicle. This is the reliable, straightforward solution you’ve been looking for.
The Direct Solution: Programmed & Ready to Install
Forget the expensive trip to the dealership and the hassle of programming. We handle the hard part for you. This replacement PCM is meticulously programmed to your vehicle’s specific Vehicle Identification Number (VIN) before it ships. This ensures it has the latest software updates from GM and communicates perfectly with your vehicle’s other modules right out of the box. It’s a true plug-and-play fix designed to restore your vehicle’s original performance and reliability.
Expert Pro Tip: Check Your Grounds First!
Over my 20+ years in the shop, I’ve seen countless GMT800-platform trucks and SUVs come in with suspected PCM failure. Before you replace the module, take 5 minutes to inspect the main ground strap located on the engine block or frame rail near the PCM. These grounds are notorious for corroding, causing voltage drops that mimic a bad PCM. A simple cleaning with a wire brush can sometimes solve the problem entirely. If the ground is clean and tight, and the symptoms persist, then the PCM is your likely culprit.
Is a Failing PCM Causing These Problems?
A faulty computer can manifest in numerous ways. If you’re experiencing any of the following, a replacement PCM is often the cure:
- ✔ Unexplained Check Engine Light (CEL)
- ✔ Vehicle refuses to start or stalls intermittently
- ✔ Harsh or incorrect transmission shifting
- ✔ Decreased fuel economy
- ✔ Communication error codes with a scan tool
- ✔ Failure to pass an emissions test
Easy Installation for Your 2003 – 2006 Escalade ESV PCM
You don’t need to be a master mechanic to install this part. With basic hand tools, you can get your truck back on the road in under an hour. Just follow these simple steps:
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the PCM: On most compatible models like the Escalade, Silverado, and Tahoe, the PCM is located in the engine bay, on the driver’s side, often under or next to the battery tray.
- Disconnect the Connectors: Carefully unclip the wiring harness connectors from the old PCM. The levers can be stiff, so apply steady pressure. Inspect the connectors for any corrosion or bent pins.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket.
- Install the New PCM: Mount your new, pre-programmed PCM and securely reconnect the wiring harnesses. You should hear a ‘click’ as they lock into place.
- Reconnect Battery: Re-attach the negative battery terminal.
- Perform Security Relearn (If Necessary): In most cases, the vehicle will start right up. Some vehicles may require a simple 10-30 minute security relearn procedure, which involves cycling the key. Instructions are readily available online for your specific model.
Guaranteed Compatibility
This module is a direct replacement for a wide range of popular GM vehicles. Simply provide your VIN at checkout to ensure a perfect match. This unit is compatible with service numbers 89017750, 12582605, 12589463, 12602802, 89017734, and 28042802. It fits many Escalade, Avalanche, Silverado, Sierra, Suburban, Tahoe, Yukon, and Hummer H2 models from 2003-2007. Please use the fitment chart to confirm your specific application.