Restore Peak Performance to Your GM Truck or Van
Is your 2003 GMC Yukon XL 2500, Sierra, or Express van running rough, shifting erratically, or displaying a persistent Check Engine Light? These are classic signs of a failing Powertrain Control Module (PCM). The PCM is the central computer of your vehicle, managing everything from fuel mixture and ignition timing to transmission shift points and emissions controls. When it fails, it can cause a cascade of frustrating and difficult-to-diagnose problems. This replacement PCM, part number 89017733, is the definitive solution to restore your vehicle’s factory performance, reliability, and efficiency.
From the Diagnostic Bay
We had a 2003 Silverado 2500 with the 8.1L V8 come in with a complaint of harsh, delayed shifting and what the owner described as ‘no power.’ He had already replaced the transmission fluid and filter, and another shop had even suggested a full transmission rebuild. After hooking up our scanner, we noticed erratic data from several sensors and communication dropouts. Instead of jumping to the transmission, we checked the PCM’s power and ground circuits, which were solid. The root cause wasn’t a mechanical failure in the transmission at all; it was a faulty PCM corrupting the signals. A correctly programmed replacement module like this one had the truck running and shifting perfectly in under an hour, saving the owner thousands of dollars.
Symptoms of a Failing Powertrain Control Module
- ✔ Unexplained Check Engine Light (CEL) illumination
- ✔ Rough or inconsistent engine idle
- ✔ Poor fuel economy
- ✔ Hesitation or stumbling during acceleration
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Engine stalling or failing to start
- ✔ Communication errors with diagnostic scan tools
- ✔ False sensor codes being stored in memory
The Critical Role of a Programmed 2003 Yukon XL 2500 PCM
Simply installing a used or unprogrammed module from another vehicle will not work. Modern vehicles rely on a complex network of modules that communicate with each other. This PCM must be programmed with your vehicle’s specific Vehicle Identification Number (VIN) and equipped with the latest software updates from General Motors. This process ensures that the module correctly recognizes your engine, transmission, anti-theft system (Passlock/VATS), and all factory options. We handle this critical programming for you before the part ever leaves our facility. All you need to do is provide your VIN, and you’ll receive a unit that is ready for a straightforward installation.
This module is a direct replacement for a wide range of GM trucks and vans from the early 2000s, serving as the brain for robust engines like the 8.1L V8 and the workhorse 4.3L V6. It directly cross-references with multiple service numbers, including 12581565, 12576106, and 89017733, guaranteeing compatibility.
Installation and Post-Installation Notes
On most compatible vehicles, the PCM is located in the engine bay, typically on the driver’s side under or near the battery tray. Installation involves disconnecting the battery, unplugging the electrical connectors from the old module, unbolting it, and then reversing the process with the new unit. After installation, you may need to perform a security relearn procedure, also known as a VATS relearn. This procedure is simple and can be done without special tools, typically involving a sequence of key cycles. In some cases, a Crankshaft Variation Relearn (CASE Relearn) may be necessary with a capable scan tool to ensure optimal engine operation and prevent misfire codes. This is a standard procedure for this type of repair.
Guaranteed Fitment for Your Vehicle
This Powertrain Control Module is a confirmed fit for the following vehicles and options:
- AVALANCHE 2500 03: Electronic Control Module; (LH front under battery)
- ASTRO 03: Electronic Control Module; (LH front by battery)
- BLAZER S10/JIMMY S15 03: Electronic Control Module; (RH front engine compartment)
- CORVETTE 04: Electronic Control Module; (RH engine compartment), ID 12581565
- CTS 04: Electronic Control Module; (RH engine compartment), Base, ID 12581565
- EXPRESS/SAVANA 1500 VAN 03: Electronic Control Module; (LH rear engine compartment)
- EXPRESS/SAVANA 2500 VAN 03: Electronic Control Module; (LH rear engine compartment)
- EXPRESS/SAVANA 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)
- SIERRA/SILVERADO 1500 PICKUP 03: Electronic Control Module; (LH front under battery), w/4.3L
- SIERRA/SILVERADO 2500 PICKUP 03: Electronic Control Module; (LH front under battery), gasoline, 8.1L
- SIERRA/SILVERADO 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 I need to provide my VIN?
Your vehicle’s VIN (Vehicle Identification Number) is essential for us to program the PCM with the correct software, calibrations, and security information for your specific engine, transmission, and factory options. This ensures compatibility and proper function.
Is this part difficult to install?
The physical installation is straightforward for someone with basic mechanical skills. It involves disconnecting the battery and swapping the module. However, a post-installation security relearn procedure is typically required, which involves a series of key turns. We recommend reviewing the specific procedure for your vehicle.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls the transmission’s electronic solenoids and shift logic. If the PCM is faulty, it can cause harsh shifting, delayed engagement, or incorrect gear selection. This is a common solution for electronically-caused transmission issues.
What is the difference between a PCM, ECM, and ECU?
The terms are often used interchangeably. ECU (Electronic Control Unit) is a generic term. ECM (Engine Control Module) typically only controls engine functions. PCM (Powertrain Control Module) is more comprehensive, controlling both the engine and the transmission, which is the case for this GM unit.
Do I need to have my old module repaired?
No, this is a complete replacement unit. There is no need to send your old, faulty module back to us. You will receive a fully programmed replacement module ready for installation.