Is Your GM Truck or SUV Experiencing Engine Problems?
If your 2003 GMC Envoy XL, or another compatible GM vehicle, is suffering from a persistent check engine light, poor performance, erratic shifting, or even a no-start condition, the root cause is often a failing Powertrain Control Module (PCM). As the central computer for your engine and transmission, the PCM’s health is critical for performance, fuel economy, and reliability. When it begins to fail, it can cause a cascade of frustrating and difficult-to-diagnose issues. Don’t let a faulty computer keep your vehicle off the road.
The Plug-and-Play Solution for Your Vehicle
This replacement PCM, part number 89017734, is the definitive solution to restore your vehicle’s factory performance. We take the guesswork out of the repair. When you place your order, simply provide us with your vehicle’s VIN. Our technicians will then program the module with the latest, most stable official GM software specific to your exact vehicle configuration. This ensures perfect compatibility and often corrects underlying software issues present in the original factory programming. Your new module arrives ready for installation, saving you a costly trip to the dealership for programming.
Common Symptoms of a Failing PCM
- ✔ Persistent Check Engine Light (CEL) with communication or processor fault codes.
- ✔ Unexplained engine stalling or hesitation during acceleration.
- ✔ Noticeable decrease in fuel efficiency.
- ✔ Harsh, delayed, or erratic automatic transmission shifting.
- ✔ Engine misfires or running rough, even after replacing plugs and coils.
- ✔ Vehicle refuses to start, despite having power to all other systems.
- ✔ Inability for diagnostic scan tools to communicate with the module.
Why Choose Our Pre-Programmed 2003 Envoy XL PCM?
Replacing the PCM on these GM vehicles isn’t just about swapping hardware. The software is key. Our process ensures that the module you receive is a perfect match. By programming it with your VIN, we guarantee it has the correct calibration for your engine, transmission, tire size, and emissions equipment. This direct-fit, pre-programmed approach makes the installation process as simple as possible for the DIY mechanic or professional technician. This module is a direct replacement for multiple service numbers, including 89017750, 12582605, 12589463, 12602802, and 28042802, ensuring wide compatibility across the GM truck and SUV lineup from the era.
Frequently Asked Questions
Do I need to program this PCM?
No. This PCM comes fully programmed to your vehicle’s specific VIN. Simply provide us with your VIN during checkout, and we handle all the programming before shipping it to you.
What other procedures are needed after installation?
After installation, you will likely need to perform a security relearn procedure, which typically involves a sequence of key turns and waiting periods. Additionally, a CASE (Crankshaft Angle Sensor Error) relearn may be required using a compatible scan tool to prevent a P1336 trouble code and ensure optimal engine timing.
Where is the PCM located on my 2003 Envoy XL?
On the 2003 GMC Envoy XL with the 5.3L engine, the PCM is typically located in the engine bay, next to the air filter box. On most other compatible GM trucks and SUVs, it is found under the hood on the driver’s side, often under or near the battery tray.
How do I know this part will fit my vehicle?
This module fits a wide range of GM vehicles from 2003-2007. Please review the detailed compatibility list on this page. The most important step is providing your VIN so we can ensure the programming is a perfect match for your specific make, model, and options.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the PCM itself (e.g., processor faults, communication errors), then this replacement module will solve the problem. It is crucial to properly diagnose the vehicle first to ensure the codes are not being caused by a faulty sensor or wiring issue elsewhere.