Restore Peak Performance to Your GM Truck or Van
Is your 2003 Yukon XL 2500, or another compatible GM vehicle, giving you headaches? If you’re dealing with frustrating issues like a persistent check engine light, erratic engine behavior, stalling, or a no-start condition, a failing Powertrain Control Module (PCM) is often the culprit. As the central computer for your engine and transmission, its proper function is non-negotiable. This replacement PCM, part number 88864822, is the definitive solution to get your vehicle running reliably again.
We take the guesswork and hassle out of the repair. Unlike sourcing a module from a salvage yard or even the dealership, this unit arrives at your door pre-programmed with the latest official GM software updates. All we need is your vehicle’s VIN at checkout. This critical step ensures that the module is a perfect electronic match for your specific vehicle, restoring factory performance, fuel efficiency, and emissions control.
From the Diagnostic Bay: The Ghost in the Machine
I once had a 2003 Silverado 2500 with the 8.1L in my shop that was a real head-scratcher. The owner had replaced plugs, wires, and even a fuel pump chasing an intermittent stall and a random P0300 (Random/Multiple Misfire) code that would pop up for no reason. All the live data looked good right up until the engine would quit. After hours of diagnostics, we decided to inspect the PCM. We found no physical damage, but on a hunch, we swapped in a known-good, programmed module. The truck fired up and ran perfectly for a week straight. The original PCM had an internal logic failure that only occurred under very specific operating conditions—a true ghost in the machine that only a new, correctly programmed 2003 Yukon XL 2500 PCM could fix.
Is Your GM Truck or Van Showing These Symptoms?
A failing PCM can manifest in numerous ways. If you’re experiencing any of the following, it’s a strong indicator that your engine’s computer needs attention:
- ✔ Persistent Check Engine Light (CEL)
- ✔ Diagnostic Trouble Codes (DTCs) like P0601, P0606, or U0100
- ✔ Unexplained drops in fuel economy
- ✔ Engine stalling, stumbling, or hesitating
- ✔ Harsh or erratic transmission shifting
- ✔ Failure to pass an emissions/smog test
- ✔ Complete no-start condition where the engine cranks but won’t fire
A Straightforward Guide to Installation
One of the biggest benefits of our VIN-programmed module is the simplified installation. While professional installation is always an option, a confident DIYer can handle this job. A security relearn procedure is required after installation, which you can do yourself without special tools.
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the PCM: On most trucks like the Yukon, Sierra, and Silverado, the PCM is located on the driver’s side, under the battery tray or near the airbox. On vans like the Express or Savana, it’s typically in the LH rear of the engine compartment.
- Disconnect Connectors: Carefully unclip and remove the wiring harness connectors from the old PCM. 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 PCM and securely reconnect the wiring harnesses.
- Reconnect Battery: Re-attach the negative battery terminal.
- Perform Security Relearn (CRITICAL): Do not skip this step. Attempt to start the engine; it will crank but not run, and the security light will be on. Turn the key to the ‘ON’ position (do not start) for 10-12 minutes, or until the security light turns off. Turn the key off for 10 seconds. Repeat this cycle two more times (for a total of three cycles). The vehicle will then start and run. Your 2003 Yukon XL 2500 PCM is now fully integrated.
Verified Vehicle Compatibility
This module is a direct-fit replacement for a wide range of GM vehicles and is compatible with numerous service numbers including 12581565, 12576106, 88864822, and 89017733. Please verify your vehicle is on the list below. If you have any questions about fitment, contact us with your VIN.
- Avalanche 2500 (2003): LH front under battery
- Astro / Safari (2003): LH front by battery
- Blazer S10 / Jimmy S15 (2003): RH front engine compartment
- Corvette / CTS (2004): RH engine compartment, ID 12581565
- Express / Savana Vans (1500, 2500, 3500) (2003): LH rear engine compartment
- S10 / S15 / Sonoma (2003): 4.3L, RH front engine compartment
- Sierra / Silverado Pickups (1500, 2500, 3500) (2003): Gasoline, various engines (4.3L, 8.1L)
- Suburban 2500 (2003): 8.1L, LH front under battery
- Yukon XL 2500 (2003): 8.1L, LH front under battery
Frequently Asked Questions
Frequently Asked Questions
How do I provide my VIN for programming?
After you complete your purchase, you will receive an email prompting you for your vehicle’s 17-digit VIN. You can also add it as a note during checkout. We cannot ship your order until we receive your VIN, as programming is a required step.
Is any additional programming required after installation?
No. This module arrives fully programmed to your vehicle’s VIN with the latest GM software. The only post-installation step is the simple security relearn procedure, which is detailed in the installation guide and requires no special tools.
Will this fix my specific problem?
This 2003 Yukon XL 2500 PCM is a direct solution for issues caused by a faulty module. While it resolves the most common electronic problems (stalling, no-start, false codes), always ensure your vehicle has been properly diagnosed. This part will not fix mechanical or wiring issues.
Is this compatible with other service numbers?
Yes, this part is a direct replacement for a wide range of service numbers, including 12581565, 12570557, 12576106, 12581565, 88864822, and 89017733, among others listed in the product details.
What is the ‘security relearn’ and is it difficult?
The security relearn (also called the Passlock or anti-theft relearn) syncs the new PCM with your vehicle’s anti-theft system. It’s a simple procedure that involves cycling the ignition key and waiting for the security light to turn off. It takes about 30 minutes and the instructions are included.