Is Your Cadillac Escalade or GM Truck Running Rough?
If you’re dealing with a frustrating no-start condition, erratic engine behavior, or a persistent Check Engine light, a failing Powertrain Control Module (PCM) is often the culprit. As the brain of your vehicle’s engine, when the PCM starts to fail, it can cause a cascade of problems that are frustrating to diagnose and can leave you stranded. This isn’t just an inconvenience; it affects your vehicle’s reliability, fuel economy, and safety. This replacement module is the definitive solution to restore your vehicle’s performance and peace of mind.
Case Study: A Tricky Diagnosis
I remember a 2005 Escalade that came into my shop a few years back. The owner was at his wit’s end. He’d been to two other places for an intermittent stalling issue and a P0601 (Internal Control Module Memory Check Sum Error) code. They had replaced sensors and checked wiring harnesses, but the problem persisted. The key was the intermittent nature of the fault. After hooking up my scan tool and monitoring live data, I noticed the PCM would momentarily lose communication right before a stall. Heat soak was aggravating a failing processor on the board. We installed a VIN-programmed PCM, and the truck ran perfectly. It’s a classic example of how a faulty module can mimic other issues, making a reliable, pre-programmed part essential for a correct first-time fix.
The Smart, Simple Solution for Your GM Vehicle
This isn’t just a replacement part; it’s a complete, ready-to-install solution. We take the guesswork and hassle out of the repair by pre-programming this 2003-2006 Escalade PCM with the latest official GM software updates. All we need is your vehicle’s VIN. This ensures that the engine computer is perfectly matched to your vehicle’s specific configuration, including the engine, transmission, and emissions equipment. You get a part that communicates flawlessly with all other modules, restoring factory performance and efficiency without an expensive trip to the dealership for programming.
Common Signs of a Failing PCM
- ✔ Check Engine Light is on with codes like P0601, P0602, P0606, or U0100.
- ✔ Engine cranks but refuses to start.
- ✔ Unexplained drops in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Intermittent stalling or rough idling.
- ✔ Failure to pass an emissions or smog test.
A Straightforward Guide to Installation
- ✔ Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait at least 15 minutes for the system to discharge.
- ✔ Locate the PCM: On most compatible models like the Escalade, Tahoe, and Sierra, the PCM is located in the engine bay, on the driver’s side, often under or next to the battery tray.
- ✔ Disconnect Connectors: Carefully release the locking tabs on the electrical connectors and pull them straight out from the module. Avoid damaging the pins or the harness.
- ✔ Remove the Old Module: Unbolt the PCM from its mounting bracket. There are typically a few bolts holding it in place.
- ✔ Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and securely fasten the bolts.
- ✔ Reconnect Everything: Plug the electrical connectors back into the new module until they click, ensuring a secure connection. Reconnect the negative battery terminal.
- ✔ Perform Security Relearn: Your vehicle will likely require a security relearn procedure (often called Passlock or Passkey) to recognize the new PCM. This can typically be done without special tools by cycling the key in the ignition. Instructions are readily available online for your specific model.
Will This Fit My Truck or SUV?
This module, part number 12589463, is a direct replacement for a wide range of GM trucks and SUVs. It is compatible with service numbers 89017750, 12582605, 12589463, 12602802, 89017734, and 28042802. While it is the correct 2003-2006 Escalade PCM, it also fits many other popular models. Please check the detailed list below to confirm compatibility with your exact vehicle and options. Providing your VIN at checkout guarantees we send you a perfectly matched and programmed unit.
ESCALADE 04 Electronic Control Module; (LH front under battery), ID 12602802
ESCALADE EXT 04 Electronic Control Module; (LH front under battery), ID 12602802
HUMMER H2 04 Electronic Control Module; (LH front under battery), SUV
SIERRA 3500 PICKUP 03 Electronic Control Module; (LH front under battery), gasoline, 6.0L
TAHOE 04 Electronic Control Module; (LH front under battery), ID 12602802
YUKON XL 2500 04 Electronic Control Module; (LH front under battery), 6.0L, ID 12602802
ENVOY XL 03 Electronic Control Module; 5.3L (next to air box)
SUBURBAN 2500 03 Electronic Control Module; (LH front under battery), 6.0L
YUKON 04 Electronic Control Module; (LH front under battery), ID 12602802
YUKON XL 2500 05-06 Electronic Control Module; (LH front under battery), 6.0L
AVALANCHE 1500 04 Electronic Control Module; (LH front under battery), ID 12602802
SIERRA 1500 PICKUP 07 Electronic Control Module; classic style (creased door skin), (LH front under battery), w/o hybrid option; w/o 4.3L
SIERRA DENALI 05-06 Electronic Control Module; (LH front under battery)
SUBURBAN 2500 04 Electronic Control Module; (LH front under battery), 6.0L, ID 12602802
YUKON XL 1500 03 Electronic Control Module; (LH front under battery)
YUKON XL 1500 04 Electronic Control Module; (LH front under battery), ID 12602802
ESCALADE ESV 03 Electronic Control Module; (LH front under battery), PCM
ESCALADE ESV 04 Electronic Control Module; (LH front under battery), ID 12602802
HUMMER H2 07 Electronic Control Module; (LH front under battery), powertrain control
SIERRA 3500 PICKUP 05-06 Electronic Control Module; (LH front under battery), gasoline, 6.0L
SIERRA DENALI 03 Electronic Control Module; (LH front under battery)
SILVERADO 2500 PICKUP 05-06 Electronic Control Module; (LH front under battery), gasoline, 6.0L
SUBURBAN 1500 03 Electronic Control Module; (LH front under battery)
HUMMER H2 05-06 Electronic Control Module; (LH front under battery)
SIERRA 2500 PICKUP 04 Electronic Control Module; (LH front under battery), gasoline, 6.0L, ID 12602802
YUKON 03 Electronic Control Module; (LH front under battery)
ESCALADE 05-06 Electronic Control Module; (LH front under battery)
ESCALADE ESV 05-06 Electronic Control Module; (LH front under battery)
AVALANCHE 1500 03 Electronic Control Module; (LH front under battery)
SILVERADO 2500 PICKUP 03 Electronic Control Module; (LH front under battery), gasoline, 6.0L
SILVERADO 1500 PICKUP 04 Electronic Control Module; (LH front under battery), w/o hybrid option; w/o 4.3L; ID 12602802
TAHOE 03 Electronic Control Module; (LH front under battery)
TAHOE 05-06 Electronic Control Module; (LH front under battery)
YUKON 05-06 Electronic Control Module; (LH front under battery)
SILVERADO 3500 PICKUP 04 Electronic Control Module; (LH front under battery), gasoline, 6.0L, ID 12602802
SILVERADO 2500 PICKUP 07 Electronic Control Module; classic style (creased door skin), (LH front under battery), gasoline, 6.0L
SUBURBAN 1500 04 Electronic Control Module; (LH front under battery), ID 12602802
ISUZU ASCENDER 03 Electronic Control Module; (LH engine), 5.3L
SIERRA 1500 PICKUP 03 Electronic Control Module; (LH front under battery), w/o 4.3L
ESCALADE 03 Electronic Control Module; (LH front under battery), PCM
SSR 03 Electronic Control Module; (next to air box)
SIERRA DENALI 07 Electronic Control Module; classic style (creased door skin), (LH front under battery)
SUBURBAN 1500 05-06 Electronic Control Module; (LH front under battery)
TRAILBLAZER EXT 03 Electronic Control Module; 5.3L (next to air box)
SILVERADO 1500 PICKUP 05-06 Electronic Control Module; (LH front under battery), w/o hybrid option; w/o 4.3L
SILVERADO 3500 PICKUP 07 Electronic Control Module; classic style (creased door skin), (LH front under battery), gasoline, 6.0L
YUKON XL 1500 05-06 Electronic Control Module; (LH front under battery)
ESCALADE EXT 05-06 Electronic Control Module; (LH front under battery)
SUBURBAN 2500 05-06 Electronic Control Module; (LH front under battery), 6.0L
HUMMER H2 03 Electronic Control Module; (LH front under battery)
SIERRA DENALI 04 Electronic Control Module; (LH front under battery), ID 12602802
ESCALADE EXT 03 Electronic Control Module; (LH front under battery), PCM
YUKON XL 2500 03 Electronic Control Module; (LH front under battery), 6.0L
Frequently Asked Questions
Frequently Asked Questions
How does the VIN programming work?
After you place your order, you will need to provide us with your vehicle’s 17-digit VIN. Our technicians use this number to flash the module with the exact GM factory software for your specific vehicle. This ensures perfect compatibility and function right out of the box.
Do I need to do any other programming after installation?
No dealer programming is required. However, you will need to perform a simple security relearn procedure. This syncs the new PCM to your vehicle’s anti-theft system and can be done in your driveway in about 30 minutes with just your key.
Where can I find my VIN?
Your VIN is located on a metal plate on the driver’s side of the dashboard (visible through the windshield), on the driver’s side door jamb sticker, and on your vehicle’s registration and insurance documents.
Is this a difficult part for a DIY mechanic to replace?
Not at all. For most of the trucks and SUVs this fits, the PCM is easily accessible in the engine bay. With basic hand tools and our step-by-step guide, most DIYers can complete the physical swap in under an hour.
What if I order the wrong part?
Because we program the module to your specific VIN, it’s crucial to verify fitment before ordering. If you are unsure, please contact us with your VIN, and our expert team will confirm you are getting the correct 2003-2006 Escalade PCM for your vehicle.