Restore Your Van’s Performance and Reliability
Is your 2003 Chevrolet Express 2500 Van running rough, stalling unexpectedly, or showing a persistent check engine light? These frustrating issues often point to a single, critical component: the Powertrain Control Module (PCM). As the central computer of your vehicle, the PCM manages everything from fuel injection and ignition timing to transmission shifting and emissions control. When it begins to fail, the symptoms can be widespread and difficult to diagnose, leaving your dependable workhorse sidelined. This replacement PCM, part number 89017733, is the definitive solution to restore your van’s factory performance and get you back on the road with confidence.
Unlike a generic part from a local store, this module is a complete, ready-to-install solution. We take the guesswork and extra expense out of the equation by programming the unit specifically for your vehicle using your VIN. This ensures that all factory settings, security information, and operational parameters are a perfect match for your van’s configuration. Furthermore, we flash it with the latest, most stable software updates available from GM, which can resolve underlying drivability issues you may not have even known were software-related. This attention to detail guarantees a seamless installation and optimal long-term operation.
We had a 2003 Savana 2500 (the GMC twin to the Express) come into the shop with a complaint of intermittent stalling and a flickering battery light. The owner had already replaced the battery and alternator twice, convinced it was a charging system problem. After hours of chasing wires, we checked the PCM’s data stream and noticed the voltage regulation commands were erratic. On a hunch, we swapped in a known-good, programmed PCM. The problem vanished instantly. The original PCM had internal damage that was causing it to misinterpret sensor data and incorrectly manage the charging system, leading to stalls. It’s a classic case where the root cause was the computer itself, not the parts it was controlling.
Common Symptoms of a Failing PCM
If your vehicle is experiencing any of the following issues, a faulty powertrain control module is a likely culprit. Replacing your old unit with a correctly programmed module can resolve these problems and prevent further damage to other components.
- ✔ Check Engine Light: The most common indicator, often with communication error codes (U-codes) or internal processor failure codes like P0601 or P0606.
- ✔ Engine Stalling or Misfiring: The engine may stall for no reason, either while driving or at idle, and may exhibit random misfires.
- ✔ No-Start Condition: The engine cranks but refuses to start due to the PCM not firing the ignition coils or fuel injectors.
- ✔ Poor Fuel Economy: An inefficiently running engine, managed by a failing PCM, will consume more fuel than usual.
- ✔ Harsh or Failed Transmission Shifting: The PCM controls transmission shift points. A bad module can cause delayed, hard, or erratic shifting.
- ✔ Inconsistent Instrument Panel Gauges: Gauges like the speedometer or tachometer may behave erratically or not work at all.
- ✔ Failed Emissions Test: The PCM is central to the emissions system, and a faulty one will almost certainly cause a test failure.
The Direct Solution: A Programmed 2003 Express 2500 PCM
This isn’t just a replacement part; it’s a comprehensive repair solution. The core of the problem with a failing computer is not just the hardware, but the software and vehicle-specific data it contains. Our process directly addresses this. When you provide your VIN, our technicians use official GM-licensed equipment to load the precise software your 2003 Express 2500 PCM requires. This critical step ensures that the module communicates flawlessly with all other systems in your van, from the anti-lock brakes to the instrument cluster. You are receiving a component that is functionally identical to the original, but with the benefit of years of software improvements from the manufacturer.
Simple Installation Process
For the 2003 Express and Savana vans, the PCM is typically located in the engine compartment on the driver’s side. Installation is straightforward: disconnect the negative battery terminal, carefully unplug the electrical connectors from the old module, unbolt it from its bracket, and install the new one in its place. Once the new module is connected and the battery is reconnected, you may need to perform a simple security relearn procedure, which can often be done without special tools. This simple process saves you a trip to the dealership and the high cost of their programming services.
Broad Compatibility
This module, identified by part number 89017733, is also a direct replacement for a wide range of other GM service numbers, including: 12581565, 12570557, 12570558, 12576106, 12576869, 12578127, 88864822, and more. It fits an extensive list of 2003-2004 GM trucks, vans, and even performance cars, making it a versatile and reliable solution for many vehicles in the GM family.
Frequently Asked Questions
Do I need to get this PCM programmed?
No. This PCM comes fully programmed to your vehicle’s specific VIN before it is shipped. It is ready for installation right out of the box, saving you a costly trip to the dealership.
Where is the PCM located on my 2003 Express 2500 Van?
On most 2003 Express and Savana vans, the PCM is located in the rear of the engine compartment on the driver’s side, mounted near the firewall.
What happens if I don’t provide my VIN?
We cannot ship the module without your vehicle’s 17-digit VIN. The programming is essential for the part to function correctly with your van’s specific engine, transmission, and options.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the PCM (common codes include P0601-P0606), then this replacement module will solve the problem. It is always recommended to have the codes read to confirm the diagnosis before ordering.
Is any additional setup required after installation?
In some cases, a security relearn procedure (also known as a Passlock relearn) may be necessary for the vehicle to start. This procedure can typically be performed by the owner and involves a series of key cycles. Instructions are readily available online or in service manuals. A CASE (Crankshaft Angle Sensor Error) relearn may also be needed, which requires a capable scan tool.