Restore Peak Performance to Your GM Truck or SUV
Is your 2003-2006 Escalade, Sierra, or Tahoe suffering from frustrating issues like intermittent stalling, erratic shifting, a persistent check engine light, or a complete no-start condition? These are classic signs of a failing Powertrain Control Module (PCM), the central computer of your vehicle. When the PCM malfunctions, it can disrupt everything from fuel delivery and ignition timing to transmission control, leaving you with an unreliable and inefficient vehicle. This replacement PCM, part number 12589463, is the definitive solution to restore your truck’s health and your peace of mind.
We take the guesswork and hassle out of the repair. Unlike sourcing a used module from a junkyard or paying steep dealership fees, this PCM arrives at your door fully programmed to your vehicle’s specific Vehicle Identification Number (VIN). We install the latest GM factory software updates, which often resolve underlying drivability issues the original software had. This means no expensive trips to the dealer for programming—it’s a true plug-and-play fix for the competent DIYer or professional technician.
From the Diagnostic Bay: The Ghost in the Machine
I once had a 2005 Silverado 2500 in my shop that was driving the owner crazy. It would run perfectly for days, then suddenly die at a stoplight and refuse to restart for 20 minutes. No consistent trouble codes were stored, just a random U0100 (Lost Communication) code now and then. We checked grounds, wiring, and fuel pressure—all perfect. After hours of diagnostics, we decided to monitor the PCM’s internal temperature data. We found that as the module heat-soaked, its command signals would drop out. It was failing internally only when hot. Swapping in a pre-programmed PCM like this one solved the problem instantly. These intermittent electrical faults are a hallmark of a dying 2003-2006 Escalade PCM and similar GM modules.
Is Your GM Truck Showing These Signs of PCM Failure?
- ✔ Check Engine Light is on with codes like P0601, P0606, or U0100
- ✔ The engine cranks but refuses to start
- ✔ Unexplained drops in fuel economy
- ✔ Harsh or erratic automatic transmission shifting
- ✔ Intermittent stalling, especially when warm
- ✔ Vehicle enters a reduced power or “limp” mode
- ✔ Communication failure with diagnostic scan tools
A Straightforward Guide to Installation
- ✔ Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait 10-15 minutes for the system capacitors to discharge.
- ✔ Locate the PCM: On most compatible GM trucks and SUVs, the PCM is located in the engine bay on the driver’s side, often under or next to the battery tray.
- ✔ Disconnect the Old Unit: Carefully lift the locking tabs and unplug the wiring harness connectors from the old PCM. Use a small screwdriver to gently pry if needed, but do not force them. Unbolt the module from its mounting bracket.
- ✔ Install the New PCM: Mount the new PCM onto the bracket and securely plug in the wiring harness connectors. Ensure they click into place.
- ✔ Reconnect Power: Re-attach the negative battery terminal.
- ✔ Perform Security Relearn: While the PCM is plug-and-play for engine operation, a security relearn procedure (often called a CASE relearn for the Crankshaft Position Sensor) is typically required to sync the new PCM with your vehicle’s anti-theft system and other sensors. This can be done with a capable bi-directional scan tool or by a qualified mechanic.
By purchasing this pre-programmed 2003-2006 Escalade PCM, you are getting a reliable, updated, and cost-effective solution. Simply provide your VIN at checkout, and we’ll handle the complex programming, allowing you to get back on the road quickly and confidently.
Verified Fitment For These GM Vehicles
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 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
ESCALADE EXT 03 Electronic Control Module; (LH front under battery), PCM
Do I need to program this PCM?
Do I need to program this PCM?
No. We handle all the programming for you before shipment. Simply provide your vehicle’s VIN during checkout, and we will load the latest, most stable GM software specific to your truck. It arrives ready to install.
Where can I find my VIN?
Do I need to program this PCM?
No. We handle all the programming for you before shipment. Simply provide your vehicle’s VIN during checkout, and we will load the latest, most stable GM software specific to your truck. It arrives ready to install.
Is a CASE relearn absolutely necessary after installation?
Do I need to program this PCM?
No. We handle all the programming for you before shipment. Simply provide your vehicle’s VIN during checkout, and we will load the latest, most stable GM software specific to your truck. It arrives ready to install.
Will this fix my check engine light?
Do I need to program this PCM?
No. We handle all the programming for you before shipment. Simply provide your vehicle’s VIN during checkout, and we will load the latest, most stable GM software specific to your truck. It arrives ready to install.
What service numbers does this part replace?
Do I need to program this PCM?
No. We handle all the programming for you before shipment. Simply provide your vehicle’s VIN during checkout, and we will load the latest, most stable GM software specific to your truck. It arrives ready to install.