Is Your 2004 Savana 1500 Experiencing Engine Problems?
If your work van is suddenly stalling, running rough, or won’t start at all, a failing Powertrain Control Module (PCM) is often the culprit. As the central computer for your engine, the PCM controls everything from fuel injection and ignition timing to transmission shifting. When it fails, it can cause a cascade of frustrating and hard-to-diagnose issues. I’ve seen it countless times in my 20+ years on the shop floor: a van comes in on a tow truck, the owner has already replaced the fuel pump and spark plugs, but the real issue was a faulty PCM driver circuit all along.
The Direct Solution: A VIN-Programmed Replacement
Forget expensive dealership visits and the hassle of finding a local shop with the right programming tools. This is a direct-fit replacement PCM for your 2004 Savana 1500, and it arrives at your door fully programmed and ready for installation. We use your vehicle’s Vehicle Identification Number (VIN) to load the latest, most stable GM factory software, ensuring perfect communication with all your van’s systems right out of the box.
Expert Pro Tip: Check Your Connectors First
Before installing your new PCM, take a moment to closely inspect the vehicle’s wiring harness connectors. On work vans like the Savana, these are often exposed to moisture and debris. Look for any signs of green or white corrosion on the pins or inside the connector housing. Use a quality electronics cleaner and a small brush to clean them thoroughly. A poor connection is one of the leading causes of premature failure in a replacement module.
Common Symptoms of a Failing 2004 Savana 1500 PCM:
- โ Check Engine Light (CEL) is on with communication error codes (U-codes).
- โ Engine cranks but refuses to start.
- โ Harsh or erratic automatic transmission shifting.
- โ Unexplained drop in fuel economy.
- โ Stalling, hesitation, or rough idling.
- โ The vehicle’s anti-theft system (Passlock/VATS) may prevent starting.
Plug-and-Play Installation: No Dealer Visit Required
Installing your new module is a straightforward process you can do with basic hand tools. This module is located in the left-hand rear of the engine compartment on your Savana van.
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the PCM: Find the module in the rear driver’s side of the engine bay.
- Disconnect Connectors: Carefully unplug the electrical wiring harness connectors from the old module.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket.
- Install the New Module: Bolt the new PCM into place, reconnect the wiring harnesses, and re-attach the negative battery terminal.
- Perform Security Relearn: In most cases, you will need to perform a simple 10-30 minute key-cycle security relearn procedure. Instructions are included with your order.
This module is a direct replacement for part numbers 12586243 and 89017739 and fits a wide variety of 2004 GM vehicles. By providing your VIN at checkout, you guarantee you’ll receive a module that is perfectly matched and programmed for your specific vehicle, restoring its performance and reliability.