Is Your Workhorse Van Suddenly Unreliable?
If your 2005-2007 Chevrolet Express 1500 is giving you headaches, the Powertrain Control Module (PCM) is often the culprit. As a mechanic with over two decades of experience, I’ve seen firsthand how a failing PCM can bring a dependable van to a dead stop. You might be experiencing frustrating and intermittent issues that are notoriously difficult to diagnose, costing you time and money.
Symptoms of a Failing Express 1500 PCM:
- ✔ Sudden stalling or engine shutting off while driving.
- ✔ Complete no-start condition where the engine cranks but won’t fire.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ A persistent Check Engine Light with communication error codes (like U-codes).
- ✔ Poor fuel economy and a noticeable loss of power.
- ✔ Multiple, unrelated warning lights appearing on the dashboard.
Expert Pro Tip: Before condemning your PCM, always check the main power and ground connections at the module itself. On these Express and Savana vans, the PCM is located in the left rear of the engine compartment. Over time, corrosion can build up on the terminals, causing voltage drops that mimic a faulty module. A quick clean with a wire brush can sometimes solve the problem and save you a lot of diagnostic time.
The Direct-Fit, Programmed Solution
Forget expensive dealership visits and the hassle of finding a shop that can program a new module. We provide a straightforward solution. This Powertrain Control Module is a direct replacement for your original unit and arrives at your door pre-programmed with the latest official GM software updates. All we need is your vehicle’s 17-digit VIN during checkout. This ensures the module communicates perfectly with your van’s specific systems right out of the box.
Plug-and-Play Installation: No Dealer Visit Required
Installing your new 2005-2007 Express 1500 PCM is a job most DIYers can handle in their own driveway. Here’s a general guide:
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- Locate the PCM: On your Express 1500, the PCM is typically found in the left (driver’s side) rear corner of the engine compartment.
- Disconnect the Harnesses: Carefully release the locking tabs on the electrical connectors and pull them straight out from the module. Inspect the connectors for any bent pins or corrosion.
- Remove the Old Module: Unbolt the PCM from its mounting bracket. It’s usually held in by a few small bolts.
- Install the New Module: Mount your new, pre-programmed PCM onto the bracket and securely tighten the bolts.
- Reconnect and Secure: Plug the electrical harnesses back into the new module until they click firmly into place. Reconnect your negative battery terminal.
- Final Steps: In some cases, a security relearn procedure may be necessary, which typically involves cycling the key. However, our programming minimizes or eliminates these extra steps for a seamless installation.
Guaranteed Compatibility
This module is a reliable replacement for several GM part numbers, ensuring broad compatibility across a range of vehicles. If your original module has part number 12589462, 12602801, or 89017749, this is the correct part for you. While this listing is focused on the 2005-2007 Express 1500 PCM, it also fits many other GM trucks and vans, including the Silverado, Sierra, Savana, Suburban, and more. Verify your vehicle in the fitment chart to confirm.