Restore Your Truck’s Brain and Brawn
Is your 2005-2006 GMC Yukon XL 2500 feeling off? Experiencing frustrating issues like random stalling, poor fuel mileage, erratic shifting, or a persistent Check Engine Light? The Powertrain Control Module (PCM), the central computer of your vehicle, is often the culprit. When it fails, it can cause a cascade of problems that are difficult to diagnose. This isn’t just an inconvenience; it’s a reliability issue that can leave you stranded. We offer a direct-fit, dependable solution: a replacement PCM, part number 12602801, that arrives at your door ready to install.
The biggest headache with PCM replacement has always been the expensive and time-consuming trip to the dealership for programming. We eliminate that step entirely. Simply provide us with your vehicle’s VIN (Vehicle Identification Number) during checkout, and our technicians will flash the module with the latest, most stable GM software updates specific to your Yukon. This ensures seamless communication between your engine, transmission, and other onboard systems, restoring the performance and dependability you expect from your 8.1L powerhouse.
From the Diagnostic Bay
I remember a customer bringing in his ’06 Suburban 2500—same platform as your Yukon XL—with a ghost of a problem. It would randomly stall at stoplights, but with no consistent codes. We checked fuel pressure, sensors, and wiring for days. On a hunch, I monitored the live data stream from the PCM and noticed the processor would occasionally drop out for a split second. That was it. We swapped in a pre-programmed PCM like this one, and the problem vanished instantly. The owner had spent a fortune on other shops guessing; the real fix was simply replacing the failing vehicle brain. It’s a scenario I’ve seen play out dozens of times on these GM trucks and vans.
Is Your Yukon Showing These Signs of PCM Failure?
- ✔ Unexplained Check Engine Light (CEL) illumination.
- ✔ Stalling for no apparent reason, especially when warm or at idle.
- ✔ The engine cranks but refuses to start.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh or delayed transmission shifting.
- ✔ Communication error codes, such as P0601 (Internal Control Module Memory Check Sum Error) or P0606 (PCM Processor Fault).
- ✔ Misfire codes that persist even after replacing spark plugs and coils.
A Straightforward Guide to Installation
- ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental reconnection.
- ✔ Locate the PCM: On your Yukon XL 2500, the PCM is located in the engine bay on the driver’s side, typically under the battery tray. You will need to remove the battery and the tray to access it.
- ✔ Disconnect Connectors: Carefully unplug the electrical connectors from the old PCM. These connectors have locking tabs that need to be released. Avoid pulling on the wires themselves.
- ✔ Remove the Old Module: Unbolt the old PCM from its mounting bracket. Keep the hardware as you will reuse it for the new module.
- ✔ Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and securely tighten the bolts. Reconnect the electrical connectors, ensuring they click firmly into place.
- ✔ Reassemble: Reinstall the battery tray and the battery. Reconnect the negative battery terminal.
- ✔ Security Relearn Procedure: In many cases, you may need to perform a security relearn procedure to sync the new PCM with your vehicle’s anti-theft system. This typically involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’, and repeating this cycle three times. Consult your owner’s manual for the exact procedure for your vehicle.
Verified Vehicle Compatibility
This module is a direct replacement for part numbers 12589462, 12602801, and 89017749. It is guaranteed to fit the following vehicles. Please ensure your vehicle and options match the list below.
SILVERADO 2500 PICKUP 05-06 Electronic Control Module; (LH front under battery), gasoline, 8.1L
SAVANA 2500 VAN 07 Electronic Control Module; (LH rear engine compartment), gasoline
SILVERADO 1500 PICKUP 07 Electronic Control Module; classic style (creased door skin), (LH front under battery), w/o hybrid option; w/4.3L
EXPRESS 3500 VAN 07 Electronic Control Module; (LH rear engine compartment), gasoline
SUBURBAN 2500 05-06 Electronic Control Module; (LH front under battery), 8.1L
AVALANCHE 2500 05-06 Electronic Control Module; (LH front under battery)
SIERRA 2500 PICKUP 07 Electronic Control Module; classic style (creased door skin), (LH front under battery), gasoline, 8.1L
SILVERADO 3500 PICKUP 05-06 Electronic Control Module; (LH front under battery), gasoline, 8.1L
EXPRESS 2500 VAN 07 Electronic Control Module; (LH rear engine compartment), gasoline
SAVANA 2500 VAN 05 Electronic Control Module; (LH rear engine compartment)
SAVANA 3500 VAN 05 Electronic Control Module; (LH rear engine compartment)
BLAZER S10/JIMMY S15 05 Electronic Control Module; (RH front engine compartment)
CTS 04-05 Electronic Control Module; (RH engine compartment), V-Series, ID 12589462
EXPRESS 2500 VAN 06 Electronic Control Module; gasoline, (LH rear engine compartment)
SAVANA 1500 VAN 05-07 Electronic Control Module; (LH rear engine compartment)
EXPRESS 2500 VAN 05 Electronic Control Module; (LH rear engine compartment)
EXPRESS 3500 VAN 05 Electronic Control Module; (LH rear engine compartment)
SAVANA 2500 VAN 06 Electronic Control Module; gasoline, (LH rear engine compartment)
SIERRA 3500 PICKUP 05-06 Electronic Control Module; (LH front under battery), gasoline, 8.1L
SILVERADO 3500 PICKUP 07 Electronic Control Module; classic style (creased door skin), (LH front under battery), gasoline, 8.1L
SAVANA 3500 VAN 06 Electronic Control Module; gasoline, (LH rear engine compartment)
SIERRA 2500 PICKUP 05-06 Electronic Control Module; (LH front under battery), gasoline, 8.1L
SAVANA 3500 VAN 07 Electronic Control Module; (LH rear engine compartment), gasoline
SIERRA 1500 PICKUP 05-06 Electronic Control Module; (LH front under battery), w/o hybrid option; w/4.3L
SIERRA 1500 PICKUP 07 Electronic Control Module; classic style (creased door skin), (LH front under battery), w/o hybrid option; w/4.3L
SIERRA 3500 PICKUP 07 Electronic Control Module; classic style (creased door skin), (LH front under battery), gasoline, 8.1L
ASTRO 05 Electronic Control Module; (LH front by battery)
EXPRESS 1500 VAN 05-07 Electronic Control Module; (LH rear engine compartment)
EXPRESS 3500 VAN 06 Electronic Control Module; gasoline, (LH rear engine compartment)
SILVERADO 1500 PICKUP 05-06 Electronic Control Module; (LH front under battery), w/o hybrid option; w/4.3L
YUKON XL 2500 05-06 Electronic Control Module; (LH front under battery), 8.1L
CTS 05 Electronic Control Module; (RH engine compartment), V-Series, ID 12602801
SILVERADO 2500 PICKUP 07 Electronic Control Module; classic style (creased door skin), (LH front under battery), gasoline, 8.1L
Frequently Asked Questions
How do I provide my VIN for programming?
After you complete your purchase, you will receive instructions on how to send us your vehicle’s 17-digit VIN. We cannot ship your module until we receive this information, as the programming is essential for the part to function in your vehicle.
Is this a plug-and-play part?
Yes, because we program the module to your VIN before shipping, it is designed to be a direct installation. However, some GM vehicles may require a security relearn procedure and/or a crank position sensor relearn (CASE relearn) to be performed with a capable scan tool for optimal performance.
Will this fix my specific problem?
This PCM is a common solution for many engine performance and no-start issues. While we cannot diagnose your vehicle remotely, if your mechanic has diagnosed a faulty PCM, this part is the correct, reliable replacement.
Do I need to send my old PCM (core) back?
No core charge is required for this purchase. You can keep or recycle your old module without any obligation to return it.
What if I have the wrong part number?
This module replaces several part numbers, including 12589462, 12602801, and 89017749. As long as your vehicle is on the compatibility list, this module will function correctly, as the VIN-specific programming is the most critical factor.