Restore Peak Performance to Your GM Truck or Van
Is your 2003 Suburban 2500, Silverado, or Express van giving you headaches? If you’re dealing with a persistent Check Engine light, rough idling, stalling, or a frustrating no-start condition, the problem often points directly to a failing Powertrain Control Module (PCM). As the central computer for your engine and transmission, a faulty PCM can cause a wide range of baffling issues. This isn’t just an inconvenience; it affects your vehicle’s reliability, fuel economy, and safety.
This replacement PCM, part number 89017733, is the definitive solution. Forget the expensive trip to the dealership and the hassle of coordinating programming. We handle the critical first step for you. Using the Vehicle Identification Number (VIN) you provide at checkout, we flash this module with the latest, most stable GM factory software specific to your vehicle. This ensures that when it arrives, it’s ready for a straightforward installation, restoring the precise control your engine needs to run smoothly and efficiently.
From the Diagnostic Bay: The Case of the Intermittent Stall
A customer brought in his ’03 Silverado 2500 with the 8.1L V8, complaining of random stalling at stoplights. There were no consistent trouble codes, just a history of a U0100 (Lost Communication with ECM/PCM) code. We checked fuel pressure, wiring, and grounds—everything seemed fine. After hours of diagnostics, I noticed on the live data scanner that the fuel pump relay command would flicker just before a stall. The relay and wiring were good. The culprit was a failing driver circuit inside the original PCM. It was a heat-sensitive fault that only appeared after 20 minutes of driving. Installing a pre-programmed 2003 Suburban 2500 PCM like this one solved the problem instantly. It’s a classic example of how an internal module fault can mimic a mechanical issue.
Is Your GM Vehicle Showing These Telltale Signs?
A failing PCM can manifest in many ways. If you’re experiencing any of the following, this module is the likely solution:
- ✔ Persistent Check Engine Light with codes like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (ECM/PCM Processor Fault).
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained drops in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ The vehicle stalls unexpectedly while driving or at idle.
- ✔ Failure to pass an emissions inspection.
- ✔ Your scan tool cannot communicate with the PCM.
A Straightforward Guide to Installation
Installing your new PCM is a manageable job for a DIYer with basic tools. Our pre-programming service eliminates the most complicated step.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- Locate the PCM: On most trucks and SUVs like the Suburban or Sierra, it’s under the hood on the driver’s side, near the battery. On Express/Savana vans, it’s typically in the rear of the engine compartment on the driver’s side.
- Disconnect Connectors: Carefully unlatch and remove the electrical harness connectors from the old module. Inspect them for any corrosion or damage.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket and remove it from the vehicle.
- Install the New PCM: Mount your new, pre-programmed module in place and securely fasten it.
- Reconnect Everything: Plug the harness connectors firmly into the new PCM until they click. Reconnect the negative battery terminal.
- Perform Security Relearn: You will likely need to perform a simple security relearn procedure. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then off, and repeating two more times. This allows the new PCM to sync with your vehicle’s anti-theft system.
Verified Vehicle Compatibility
This module is a direct-fit replacement for a wide range of 2003 and 2004 GM models. Please verify your vehicle is on this list. This unit replaces service numbers: 12581565, 8125815650, 12570557, 12570558, 12576106, 12576869, 12578127, 88864822, and 89017733.
- 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/SAVANA VANS 1500/2500/3500 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)
- SIERRA/SILVERADO 1500 PICKUP 03: Electronic Control Module; (LH front under battery), w/4.3L
- SIERRA/SILVERADO 2500/3500 PICKUP 03: Electronic 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 for us to program the PCM with the exact software calibration for your vehicle’s specific engine, transmission, and options. This ensures perfect compatibility and function right out of the box, saving you a trip to the dealer.
Is this a plug-and-play part?
Yes, because we program it before shipping, it is a direct physical replacement. However, you will need to perform a simple, no-tool “Security Relearn Procedure” after installation to sync the new PCM with your vehicle’s anti-theft system.
Will this fix my specific problem?
This module corrects issues directly caused by a failing PCM, such as internal processor faults (P0601, P0606), communication errors, and faulty sensor driver circuits. It’s a critical part, but always ensure you’ve ruled out other potential causes like bad wiring or sensors.
What’s the difference between a PCM, ECM, and Engine Computer?
These terms are often used interchangeably. PCM (Powertrain Control Module) is the most accurate term as it typically controls both the engine and the transmission. ECM (Engine Control Module) or Engine Computer are older terms but refer to the same component.
Is this part difficult to install myself?
For someone with basic mechanical skills, this is a very manageable job. It involves disconnecting the battery, unplugging a few connectors, and unbolting the module. Our pre-programming service eliminates the need for specialized computer equipment.