Is Your Express Van Running Rough, Stalling, or Showing a Check Engine Light?
As a mechanic with over two decades of experience under the hood, I’ve seen my fair share of Chevrolet Express and GMC Savana vans limp into the shop. The symptoms are almost always the same: erratic idling, poor fuel economy, a transmission that won’t shift correctly, or a persistent check engine light that just won’t go away. In many cases, the root cause isn’t a faulty sensor or a bad wire; it’s the brain of the operation โ the Powertrain Control Module (PCM).
This isn’t just another part. This is a direct-fit, professionally programmed solution for your vehicle. We take your vehicle’s unique VIN and flash this module with the latest, most stable software updates directly from GM. This means you get a component that is perfectly matched to your van’s specific systems, restoring its original performance and efficiency without a costly and time-consuming trip to the dealership.
Why a VIN-Programmed PCM is the Smart Choice
A few years back, a local delivery driver brought his 2006 Express 2500 to my shop. It was randomly stalling at intersections, a dangerous and frustrating problem. His scanner showed a P0601 ‘Internal Control Module Memory Check Sum Error.’ He had already replaced the battery and checked the alternator. The problem was the PCM itself. We installed one of these VIN-programmed modules, and he was back on his route the same afternoon. That’s the difference this makes โ a reliable fix that gets you back to work.
Common Symptoms of a Failing 2005-2007 Express 1500 PCM:
- โ Persistent Check Engine Light (CEL)
- โ Engine stalling or cutting out unexpectedly
- โ Rough or erratic engine idle
- โ Poor acceleration and loss of power
- โ Decreased fuel mileage
- โ Harsh or incorrect transmission shifting
- โ Vehicle won’t start, even with a good battery
Expert Pro Tip: Check Your Connectors!
Before you install your new PCM, take a moment to closely inspect the main electrical harness connectors. On these Express and Savana vans, the PCM is located in the engine compartment (left rear side), where it’s exposed to heat and moisture. I’ve seen countless cases where corrosion on the pins or a slightly bent pin was the real source of the problem. Use a good quality electronics cleaner and a small brush to clean both the harness-side and module-side pins to ensure a perfect connection.
Simple Installation, No Dealer Required
We’ve made this process as straightforward as possible. Because the module arrives programmed for your exact vehicle, you don’t need any specialized scan tools for installation. This is a true plug-and-play solution for the DIY mechanic or professional technician.
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the PCM: On the 2005-2007 Express/Savana, it’s typically found in the rear left of the engine compartment.
- Disconnect Connectors: Carefully unlatch and remove the electrical connectors from the old module.
- Remove Old Module: Unbolt the old PCM from its mounting bracket.
- Install New Module: Bolt the new, programmed PCM into place.
- Reconnect Everything: Firmly re-seat the electrical connectors until they click into place. Reconnect the negative battery terminal.
- Perform Security Relearn (If Necessary): In some cases, a simple 10-30 minute key-on security relearn procedure may be required. Instructions are readily available online or in your service manual.
Guaranteed Compatibility
This module is a direct replacement for part numbers 12602801, 12589462, and 89017749. It fits a wide range of GM vehicles beyond the Express van, including the Silverado, Sierra, Suburban, and more. Simply provide your VIN at checkout, and we’ll handle the rest, ensuring a perfect match.