Restore Peak Performance to Your GM Vehicle
If you’re dealing with frustrating, intermittent issues like stalling, no-start conditions, or a persistent check engine light in your 2003 GMC Savana 3500 Van, the culprit is often the Powertrain Control Module (PCM). As the central computer for your engine and transmission, a failing PCM can wreak havoc on your vehicle’s reliability. This replacement module, part number 89017733, is the definitive solution to get your workhorse van or truck back on the road, running smoothly and dependably.
From the Diagnostic Bay: The Ghost in the Machine
I once had a 2003 Silverado with the 8.1L come into my shop with a problem that was driving the owner crazy. The truck would randomly lose power and sometimes stall at idle, but there were no consistent trouble codes—just a generic communication error that would pop up now and then. We checked grounds, wiring harnesses, and sensors for weeks. Finally, on a hunch, we monitored the PCM’s internal temperature data. We saw it spiking just before an event. The internal processor was failing under heat load, a common issue in these P59 controllers. Swapping in a quality, correctly programmed PCM like this one solved the problem instantly. It’s a reminder that sometimes the ‘brain’ itself is the source of the phantom issues.
Is Your GM Vehicle Exhibiting These Glitches?
A faulty PCM doesn’t always fail completely. It often causes a series of confusing symptoms. Here are the most common signs I’ve seen in my 20+ years of diagnostics:
- ✔ Unexplained Check Engine Light (CEL) illumination.
- ✔ Stalling, stumbling, or rough idling for no apparent reason.
- ✔ Drastic decrease in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Complete no-start condition where the engine cranks but won’t fire.
- ✔ Diagnostic trouble codes (DTCs) pointing to internal module failure, such as P0601, P0606, or U0100.
The Critical Advantage: VIN-Specific Programming
Don’t settle for a generic, off-the-shelf module that requires an expensive trip to the dealership. We take the hassle and extra cost out of the equation. When you purchase this 2003 Savana 3500 Powertrain Control Module, we flash it with the latest official GM software updates, specifically calibrated to your vehicle’s unique Vehicle Identification Number (VIN). This ensures all systems—from the engine and transmission to the anti-theft system—communicate perfectly right out of the box for a seamless installation.
A Straightforward Guide to Installation
Replacing the PCM on these GM vans and trucks is a job most DIYers can handle with basic tools. Just follow these steps carefully.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental reconnection.
- Locate the PCM: On the Savana/Express vans, the PCM is located in the engine compartment on the driver’s side, towards the rear. On trucks, it’s typically under the battery tray on the driver’s side.
- Disconnect the Connectors: The PCM has several large electrical connectors. Each has a locking tab or lever. Carefully release the locks and pull the connectors straight out. Never force them.
- Remove the Old Module: Unbolt the PCM from its mounting bracket. Note the orientation of the module before removing it completely.
- Install the New Module: Mount your new, pre-programmed PCM onto the bracket and secure the bolts.
- Reconnect Everything: Plug the electrical connectors firmly into the new module until they click and lock into place. Reconnect your negative battery terminal.
- Security Relearn Procedure: In many cases, you will need to perform a simple security relearn. Turn the key to the ‘ON’ position for 10-15 minutes, then turn it ‘OFF’ for 10 seconds. Repeat this cycle 3 times. The vehicle should then start and run normally.
Verified Vehicle Compatibility List
This module is a direct replacement for service number 89017733 and other compatible numbers. Please verify your vehicle is on this list before ordering:
- ASTRO 03: Electronic Control Module; (LH front by battery)
- AVALANCHE 2500 03: Electronic Control Module; (LH front under battery)
- BLAZER S10/JIMMY S15 03: Electronic Control Module; (RH front engine compartment)
- CTS 04: Electronic Control Module; (RH engine compartment), Base, ID 12581565
- CORVETTE 04: Electronic Control Module; (RH engine compartment), ID 12581565
- EXPRESS 1500/2500/3500 VAN 03: Electronic Control Module; (LH rear engine compartment)
- S10/S15/SONOMA 03: Electronic Control Module; (RH front engine compartment), 4.3L
- SAFARI (GMC) 03: Electronic Control Module; (LH front by battery)
- SAVANA 1500/2500/3500 VAN 03: Electronic Control Module; (LH rear engine compartment)
- SIERRA 1500 PICKUP 03: Electronic Control Module; (LH front under battery), w/4.3L
- SIERRA 2500/3500 PICKUP 03: Electronic Control Module; (LH front under battery), gasoline, 8.1L
- SILVERADO 2500/3500 PICKUP 03: Engine Control Module; (LH front under battery), gasoline, 8.1L
- SUBURBAN 2500 03: Electronic Control Module; (LH front under battery), 8.1L
- YUKON XL 2500 03: Electronic Control Module; (LH front under battery), 8.1L
Frequently Asked Questions
Why do you need my VIN?
Your VIN is essential. It allows us to load the exact, correct software calibration from GM for your vehicle’s specific engine, transmission, and options. This ensures perfect compatibility and performance without needing a trip to the dealer.
Is this a difficult part to install?
For most individuals with basic mechanical skills and hand tools, this is a straightforward replacement. The main steps are disconnecting the battery, swapping the electrical connectors, and unbolting the module. Our included guide walks you through it.
What happens if I don’t replace a failing PCM?
Ignoring a failing PCM can lead to more severe issues. You may experience worsening fuel economy, potential damage to the catalytic converter from incorrect fuel mixtures, and eventually, a no-start condition that will leave you stranded.
Will this fix my check engine light?
If the check engine light is caused by an internal fault within the old PCM (like code P0601), then yes, this new module will resolve the issue. However, if the light is on due to a separate faulty sensor or component, that issue will still need to be addressed.
Does this part come with a warranty?
Yes, all of our electronic modules come with a comprehensive warranty. Please see the warranty tab on this page for complete details and peace of mind with your purchase.