Restore Your Vehicle’s Heartbeat
Is your truck or SUV feeling sluggish, unpredictable, or just not itself? The Powertrain Control Module (PCM) is the central command center for your engine and transmission. When it begins to fail, it can cause a cascade of frustrating issues, from a persistent check engine light to poor fuel economy and even a no-start condition. This replacement PCM, service number 12586242, is the definitive solution to bring back the crisp performance and steadfast reliability you depend on. We pre-program it to your vehicle’s unique VIN, ensuring it’s ready for a straightforward installation right out of the box.
Is a Failing PCM Holding You Back?
A faulty engine computer can manifest in numerous ways, often mimicking other mechanical problems. Before you spend a fortune chasing down phantom issues, see if your vehicle is displaying these common symptoms of PCM failure:
- ✔ Unexplained Check Engine Light (CEL) illumination
- ✔ Stalling, rough idling, or engine misfires
- ✔ Harsh or erratic automatic transmission shifting
- ✔ A noticeable drop in fuel efficiency
- ✔ The engine cranks but refuses to start
- ✔ Communication error codes, such as P0601, P0605, or P0606
- ✔ Intermittent electrical or sensor-related problems
Expert Diagnostic Tip
Before condemning your PCM, always ensure your battery and charging system are in top condition. A weak battery or a failing alternator can cause low voltage situations that create bizarre symptoms nearly identical to PCM failure. A quick voltage test can save you time and confirm you’re replacing the right part.
Guided Installation for a Confident Repair
Replacing the brain of your vehicle might sound intimidating, but our pre-programming service makes it a manageable task for the home mechanic. Follow these simple steps to get back on the road with confidence.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery before beginning any electronic work.
- Locate the Module: On most compatible trucks and SUVs, the PCM is located in the engine bay, on the driver’s side, under or next to the battery tray. On models like the Trailblazer or Envoy, it’s typically next to the airbox.
- Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs that need to be released. Once disconnected, unbolt the module from its mounting bracket and remove it.
- Install the New PCM: Mount your new, pre-programmed PCM securely in the bracket. Reconnect the electrical harnesses, ensuring they click firmly into place.
- Reconnect Power: Re-attach the negative battery terminal and tighten it securely.
- Perform Security Relearn: Your vehicle now needs to recognize the new module. This is done with a simple “key relearn” procedure that typically takes about 30 minutes and requires no special tools. Instructions are widely available online for your specific model.
Tailored Fit for Your 2004 GM Vehicle
This 2004 Escalade ESV PCM is a direct replacement for units with service numbers 12586242, 19299226, or 89017738, and many others. It is guaranteed to be compatible with the following 2004 models. Please match your service number or contact us to ensure perfect compatibility.
- Cadillac Escalade, ESV, EXT
- Chevrolet Avalanche 1500
- Chevrolet Silverado 1500, 2500, 3500 (Gasoline)
- Chevrolet SSR
- Chevrolet Suburban 1500, 2500
- Chevrolet Tahoe
- Chevrolet Trailblazer EXT (5.3L)
- GMC Envoy XL, XUV (5.3L)
- GMC Sierra 1500, 2500, 3500, Denali (Gasoline)
- GMC Yukon, XL 1500, XL 2500
- Hummer H2
- Buick Rainier (5.3L)
- Isuzu Ascender (5.3L)
By installing this correctly programmed module, you’re not just fixing a problem—you’re restoring the precise fuel delivery, ignition timing, and transmission control that your vehicle was designed with. Regain that smooth, powerful, and worry-free driving experience you deserve.
Is this module ready to install out of the box?
Yes! We program the module to the VIN you provide during checkout. The only step you’ll need to perform after physical installation is a simple security relearn procedure, which syncs the new PCM to your vehicle’s anti-theft system. This process takes about 30 minutes and does not require any special tools.
Do I need to send my old computer back?
No, there is no core charge or need to return your old module. You can keep it or dispose of it responsibly.
How do I provide my vehicle’s VIN?
Please enter your 17-digit VIN in the notes section during the checkout process. If you forget, you can also reply to your order confirmation email with the VIN. We cannot ship your order until we receive this information.
Will this fix my transmission shifting problems?
In many cases, yes. The PCM controls the transmission’s shift points and line pressure. If your transmission issues are electronic in nature and caused by a faulty module, this part is the correct solution. It will not fix internal mechanical failures within the transmission itself.
What if my original part number is not on the list?
The list of compatible service numbers (like 12586242, YFKD, YFXL, etc.) is extensive. If you don’t see your specific number, please contact us with your VIN and original part number. We will verify compatibility for you to ensure you receive the correct part.