Restore Peak Performance to Your GM Truck or SUV
Is your Cadillac Escalade, Silverado, or Tahoe suffering from frustrating issues like a persistent check engine light, erratic shifting, or a dreaded no-start condition? As a technician with over 20 years of experience, I’ve seen these symptoms countless times, and they often point directly to a failing Powertrain Control Module (PCM). The PCM is the brain of your vehicle, managing everything from fuel delivery and ignition timing to transmission shifts. When it falters, the entire vehicle’s performance suffers. This isn’t just an inconvenience; it can be a serious reliability issue.
This replacement PCM is the definitive solution to get your vehicle running right again. We take the guesswork and high dealership costs out of the equation. Before we ship it, we program the module with the very latest GM-certified software, tailored specifically to your vehicle using its unique VIN. This ensures optimal performance, fuel economy, and emissions control, often correcting issues the original factory software didn’t address. A properly functioning 2003-2006 Escalade PCM is critical for the health and longevity of your engine and transmission.
Case Study: A Tricky Diagnosis
I remember a 2005 Silverado 2500 that came into my shop with a laundry list of complaints: harsh 1-2 shift, intermittent stalling at idle, and a check engine light with codes for an O2 sensor and a transmission solenoid. The owner had already replaced both parts with no success. After checking the wiring, my diagnostics led me to the PCM. The internal processor was failing, sending faulty signals to various components. After installing a VIN-programmed PCM like this one, all the codes vanished, the transmission shifted smoothly, and the engine idled perfectly. It’s a classic example of how a single failing module can create multiple, misleading symptoms.
Common Signs of a Failing PCM
- ✔ Check Engine Light is on with codes like P0601 (Internal Memory Error) or P0606 (PCM Processor Fault).
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained drops in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Engine stalling, stumbling, or misfiring for no apparent reason.
- ✔ Communication errors with your scan tool.
- ✔ Other modules, like the ABS or BCM, setting communication-related trouble codes.
DIY Installation: A Step-by-Step Guide
- ✔ 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 most compatible trucks and SUVs (like the Escalade, Tahoe, and Silverado), the PCM is located in the engine bay on the driver’s side, often under or next to the battery tray.
- ✔ Disconnect the Connectors: Carefully release the locking tabs and unplug the wiring harness connectors from the old PCM. The levers can be stiff, so apply steady pressure. Never pull on the wires themselves.
- ✔ Remove the Old Module: Unbolt the PCM from its mounting bracket. Keep the hardware, as you may need to reuse it.
- ✔ Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and securely tighten the bolts.
- ✔ Reconnect Everything: Plug the wiring harness connectors firmly into the new module until they click into place. Reconnect the negative battery terminal.
- ✔ Perform Security/CASE Relearn: While the PCM is programmed to your VIN, your vehicle’s anti-theft system (Passlock/VATS) may need to be relearned. Additionally, a Crankshaft Variation (CASE) relearn with a capable scan tool is required to prevent a P1336 misfire code. This is a crucial final step for smooth operation.
Will This Fit My Truck or SUV?
This module is a direct-fit replacement for a wide range of GM vehicles. Please verify your vehicle is on this list and that your original module carries one of the compatible service numbers: 89017750, 12582605, 12589463, 12602802, 89017734, or 28042802. This is the correct part for a 2003-2006 Escalade PCM and many other models.
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)
SIERRA 2500 PICKUP 05-06 Electronic Control Module; (LH front under battery), gasoline, 6.0L
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
SILVERADO 3500 PICKUP 05-06 Electronic Control Module; (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
SIERRA 1500 PICKUP 04 Electronic Control Module; (LH front under battery), w/o hybrid option; w/o 4.3L; ID 12602802
ESCALADE 03 Electronic Control Module; (LH front under battery), PCM
SSR 03 Electronic Control Module; (next to air box)
SIERRA 2500 PICKUP 03 Electronic Control Module; (LH front under battery), gasoline, 6.0L
SIERRA DENALI 07 Electronic Control Module; classic style (creased door skin), (LH front under battery)
SILVERADO 3500 PICKUP 03 Electronic Control Module; (LH front under battery), gasoline, 6.0L
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 1500 PICKUP 07 Electronic Control Module; classic style (creased door skin), (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)
SIERRA 1500 PICKUP 05-06 Electronic Control Module; (LH front under battery), w/o hybrid option; w/o 4.3L
SUBURBAN 2500 05-06 Electronic Control Module; (LH front under battery), 6.0L
HUMMER H2 03 Electronic Control Module; (LH front under battery)
SIERRA 2500 PICKUP 07 Electronic Control Module; classic style (creased door skin), (LH front under battery), gasoline, 6.0L
SIERRA 3500 PICKUP 07 Electronic Control Module; classic style (creased door skin), (LH front under battery), gasoline, 6.0L
SIERRA DENALI 04 Electronic Control Module; (LH front under battery), ID 12602802
SILVERADO 1500 PICKUP 03 Electronic Control Module; (LH front under battery), w/o 4.3L
ESCALADE EXT 03 Electronic Control Module; (LH front under battery), PCM
SIERRA 3500 PICKUP 04 Electronic Control Module; (LH front under battery), gasoline, 6.0L, ID 12602802
SILVERADO 2500 PICKUP 04 Electronic Control Module; (LH front under battery), gasoline, 6.0L, ID 12602802
YUKON XL 2500 03 Electronic Control Module; (LH front under battery), 6.0L
How does the VIN programming work?
How does the VIN programming work?
After you complete your purchase, you will need to provide us with your vehicle’s 17-digit VIN. We use this number to access the latest official GM software updates for your specific make, model, and engine/transmission combination. We then flash this software onto the PCM, making it ready for installation when it arrives.
Do I need to take my vehicle to a dealer after installation?
While the main engine programming is done, you or your mechanic will need to perform a security relearn procedure so the PCM communicates with your anti-theft system. A Crankshaft Variation (CASE) relearn is also required using a compatible scan tool to ensure the engine computer reads the crankshaft position sensor correctly and doesn’t set a false misfire code.
Is this a new or a used part?
This is a high-quality, tested, and verified used OEM part. Each module undergoes rigorous inspection and testing to ensure it meets or exceeds original factory specifications before being programmed and shipped. This provides OEM reliability without the high cost of a new part from a dealership.
How do I find my original part number to check compatibility?
Your original part number is printed on a sticker on the PCM itself. You will need to locate the module on your vehicle (typically near the battery or airbox) to read the service number. This module replaces several service numbers, including 12602802 and 89017750.