Is Your Work Van Unreliable? Get Back on the Job Fast.
As a mechanic with over two decades of experience, I know that a work van like your 2004 Savana 2500 isn’t just a vehicleโit’s your livelihood. When it starts acting up with baffling electrical issues, every minute it’s down costs you money and reputation. You might be experiencing a check engine light that won’t go away, rough idling, stalling at intersections, or even a complete no-start condition. These are classic signs that the brain of your engine, the Powertrain Control Module (PCM), is failing.
Don’t waste time and money guessing at the problem or paying for expensive dealership diagnostics. This is a direct-fit, VIN-programmed PCM for your 2004 Savana 2500, designed to solve those frustrating issues and restore your van’s reliability. We take your vehicle’s unique VIN and flash this module with the latest, most stable software updates directly from GM. This means it arrives at your door ready to install, with no need for a trip to the dealer for expensive programming.
Common Symptoms of a Failing GM PCM:
- โ Persistent Check Engine Light (CEL) with communication error codes (like P0601, P0606).
- โ Engine stalling, stumbling, or hesitating during acceleration.
- โ Harsh or erratic transmission shifting.
- โ A complete no-start condition where the engine cranks but won’t fire.
- โ Poor fuel economy and decreased engine performance.
- โ Instrument cluster warning lights flickering or acting erratically.
From the Shop Floor: “A customer’s 2004 Savana 2500 came in last week with these exact symptoms. It was a plumber’s van, and he was losing jobs because it would randomly stall. His scanner showed a P0601 code – Internal Control Module Memory Check Sum Error. After we confirmed his battery and wiring were solid, we knew the original PCM had failed. Swapping in a pre-programmed unit like this one is the most efficient repair. We had him back on the road, running perfectly, in under an hour. It’s a fix I’ve performed hundreds of times on these GM platforms.”
Plug-and-Play Installation for Your 2004 Savana 2500 PCM
Replacing the PCM on your Savana van is a straightforward job you can do with basic hand tools. Because we program it to your VIN, you skip the most complicated part. For the Savana and Express vans, the module is typically located in the LH (driver’s side) rear of the engine compartment.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and wait 10-15 minutes for any residual power to drain.
- Locate the PCM: Find the module on the driver’s side of the engine bay, near the firewall. It will have several large electrical connectors attached.
- Disconnect Connectors: Carefully unlatch and remove all electrical harness connectors from the old PCM. Inspect them for any corrosion or bent pins.
- Remove the Old Module: Unbolt the PCM from its mounting bracket and remove it from the vehicle.
- Install the New Module: Mount your new, pre-programmed PCM onto the bracket and securely reconnect all the electrical connectors. You should hear a ‘click’ as they lock into place.
- Reconnect Battery: Re-attach the negative battery terminal. The vehicle may require a security relearn procedure, which typically involves turning the key to the ‘ON’ position for 10-15 minutes before starting.
Guaranteed Compatibility
This module, service number 12586243, is the correct replacement for a wide range of 2004 GM vehicles. It is also a direct replacement for part number 89017739. While this listing is focused on the 2004 Savana 2500, it also fits models like the Silverado, Sierra, Express, Suburban, Tahoe, GTO, and Corvette from the same era. Simply provide your VIN at checkout, and we handle the rest, ensuring a perfect software match for your specific vehicle and its options.