Restore Peak Performance to Your GM Vehicle
Is your 2003 Chevrolet Express 1500, GMC Savana, or another compatible GM truck or van running poorly? An erratic idle, poor fuel economy, shifting problems, or a persistent Check Engine Light can often be traced back to a failing Powertrain Control Module (PCM). As the central computer of your vehicle, the PCM is responsible for managing everything from fuel injection and ignition timing to transmission shift points and emissions controls. When it fails, the entire vehicle’s performance suffers. This replacement Powertrain Control Module, part number 89017733, is the definitive solution to get your vehicle running like new again.
We take the guesswork and hassle out of the replacement process. Unlike a generic module from a parts store, this unit is specifically programmed for your vehicle before it ships. Simply provide us with your Vehicle Identification Number (VIN) during checkout, and our technicians will flash the module with the latest, most up-to-date GM factory software for your exact build. This ensures seamless integration, optimal performance, and correct communication with all other modules in your vehicle. It’s the closest you can get to a direct-from-the-factory solution.
Diagnosing a Faulty 2003 Express 1500 PCM
A failing PCM can manifest in various ways, often mimicking other sensor or component failures. If you’ve been chasing down issues without success, it might be time to consider the vehicle’s computer. Here are the most common symptoms associated with a problematic PCM:
- ✔ Check Engine Light: The light may be on continuously or intermittently, often with communication-related error codes (U-codes) or multiple, seemingly unrelated sensor codes.
- ✔ Poor Engine Performance: You may experience a loss of power, hesitation during acceleration, rough idling, or engine stalling.
- ✔ Reduced Fuel Economy: An incorrect air/fuel mixture controlled by a faulty PCM can cause a significant drop in MPG.
- ✔ Transmission Issues: The PCM also controls transmission functions. Symptoms can include harsh shifting, delayed engagement, or being stuck in one gear (limp mode).
- ✔ Engine No-Start Condition: In severe cases, the PCM may fail to control the fuel pump or ignition system, preventing the vehicle from starting at all.
- ✔ Intermittent Problems: Issues that come and go with temperature changes can point to failing internal circuits within the module.
From the Diagnostic Bay
We once had a 2003 GMC Savana 2500 in the shop with a classic no-start condition. The owner had already replaced the fuel pump and the crankshaft position sensor based on some forum advice, but the van still wouldn’t fire up. When we connected our scanner, we couldn’t even establish communication with the PCM. After checking the powers and grounds to the module, we confirmed they were good. This told us the PCM itself was the point of failure. We installed a VIN-programmed module, performed the security relearn, and the engine started on the first crank. It’s a powerful reminder that diagnosing the root cause saves a lot of time and money compared to just replacing parts.
A Programmed, Reliable Solution
This module is a direct replacement for a wide range of GM vehicles from the 2003-2004 model years, including the Chevy Express, GMC Savana, Chevy Silverado, GMC Sierra, and many more. It replaces a long list of original service numbers, including 12581565, 12570557, 12576106, and 89017733, ensuring broad compatibility. The key to our service is the VIN-specific programming. This critical step ensures that the module you receive is loaded with the correct software for your vehicle’s engine, transmission, and specific options, eliminating compatibility conflicts and ensuring a smooth installation process.
After installing the module, you will likely need to perform a security relearn procedure (often called a VATS relearn or Passlock relearn). This is a simple process that syncs the new PCM with your vehicle’s anti-theft system and ignition keys. It typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating the cycle three times. This procedure does not require any special tools and is a standard part of replacing a GM PCM from this era.
Frequently Asked Questions
Do I need to have this PCM programmed?
No, you do not. We handle the programming for you before we ship the part. All you need to do is provide your vehicle’s 17-digit VIN when you place your order. We will flash the module with the latest GM software specific to your vehicle.
What is the security relearn procedure?
The security relearn, or VATS relearn, is a required step that syncs the new PCM to your vehicle’s anti-theft system. It’s a simple process you can do yourself, typically involving a sequence of key turns. Instructions are widely available online, and it usually takes about 30 minutes to complete without any special tools.
Where is the PCM located on a 2003 Chevy Express Van?
On the 2003 Express and Savana vans, the Powertrain Control Module is typically located in the engine compartment on the driver’s side, often near the rear of the compartment or close to the firewall.
How can I be sure this part fits my vehicle?
This module fits a wide range of 2003-2004 GM trucks, vans, and SUVs. Please review the detailed fitment list on this page. The most important step is providing your VIN, which allows us to program it correctly and confirm compatibility for your specific vehicle.
What happens if I don’t provide my VIN?
Providing your VIN is mandatory for this part. We cannot ship the module without programming it, as it will not function in your vehicle. The order will be held until we receive the VIN from you. This ensures you get a part that works correctly right out of the box.