Is Your Work Van Down and Costing You Money?
For a business owner, a 2004 GMC Savana 3500 isn’t just a vehicle; it’s a critical tool. When it’s down with electrical gremlinsโstalling, running rough, or refusing to start altogetherโyour entire operation can grind to a halt. In my 20+ years as a technician, I’ve seen firsthand how a faulty Engine Control Module (ECM) can mimic a dozen other problems, leading to wasted time and money on unnecessary parts. If you’re facing confusing symptoms and your diagnostic scanner can’t communicate with the engine computer, you’ve likely found the culprit.
Real-World Diagnosis: A Customer’s Story
“A plumbing contractor’s 2004 Savana 3500 was towed to my shop last month. It would crank but never fire up, and the check engine light was on. The owner had already replaced the fuel pump and crank sensor with no luck. My initial scan showed a ‘No Communication with PCM’ error. After verifying power and ground at the ECM connector in the rear engine compartment, it was clear the module itself had failed internally. We installed one of our pre-programmed units, and the van fired up on the first try, getting him back to his job site the same day.”
The Direct Solution: A Plug-and-Play Programmed ECM
This isn’t just a replacement part; it’s a complete solution. We are offering a genuine GM Engine Control Module, part number 89017739 (also compatible with 12586243), that arrives at your door ready for installation. The biggest hurdle with ECM replacement is the expensive and time-consuming programming required at a dealership. We eliminate that step entirely.
- โ VIN Programmed: We flash the module with your vehicle’s specific Vehicle Identification Number (VIN) and the latest GM-certified software before it ships.
- โ No Dealer Required: This is a true plug-and-play repair. You can do it yourself in your driveway or have your local mechanic install it without needing specialized dealer tools.
- โ Restores Original Functionality: Solves common failure symptoms like no-start conditions, erratic engine performance, false sensor codes, and harsh shifting.
- โ Cost-Effective Repair: Avoid the high labor costs and programming fees associated with a dealership visit.
Easy Installation for Your 2004 Savana 3500 ECM
Replacing the ECM on your Savana is straightforward. It’s located in the left-hand (driver’s side) rear of the engine compartment. Follow these steps for a successful installation:
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent any accidental reconnection.
- Locate the ECM: Open the hood and find the module at the back of the engine bay on the driver’s side. It’s a silver box with multiple large wiring harness connectors.
- Disconnect the Harnesses: Carefully release the locking levers on each electrical connector and pull them straight out from the module. Never force them.
- Remove the Old Module: Unbolt the mounting hardware that secures the old ECM to its bracket. Set the old module aside.
- Install the New Module: Mount your new, pre-programmed ECM onto the bracket and tighten the bolts.
- Reconnect Everything: Firmly plug the wiring harnesses back into the new ECM until the locking levers click into place. Reconnect your negative battery terminal.
- Final Step: In some cases, a security relearn procedure may be necessary, which involves cycling the key. However, for most installations, the vehicle will start and run immediately.
By providing your VIN at checkout, you ensure this module is perfectly matched to your van’s specific configuration, making the repair process as simple as possible. Get your reliable workhorse back in service and earning its keep.