2004 Buick Rainier Engine Computer PCM 12586242

Restore Your GM’s Engine Performance

Experiencing stalling, a check engine light, or poor performance? This replacement Engine Control Module (PCM 12586242) is the solution. We pre-program it to your vehicle’s VIN for a straightforward installation. Get your 2004 GM truck or SUV running like new. Order today!

$119.95

+11.99 USPS Priority Shipping

Availability: In stock



Guaranteed Safe Checkout

Is Your 2004 GM Truck or SUV Running Rough?

The Powertrain Control Module (PCM), often called the engine computer, is the central command center for your vehicle’s engine and transmission. It meticulously manages everything from fuel delivery and ignition timing to emission controls and automatic transmission shifts. When the PCM begins to fail in a 2004 model like the Buick Rainier, Chevy Silverado, or GMC Sierra, it can cause a cascade of frustrating and difficult-to-diagnose problems. Symptoms can range from a simple check engine light to a vehicle that refuses to start, leaving you stranded. This isn’t just an inconvenience; it’s a critical component failure that compromises your vehicle’s performance, fuel economy, and reliability.

From the Diagnostic Bay

I remember a 2004 Chevy Tahoe that came into the shop with a complaint of intermittent stalling at stoplights. The owner had already replaced the throttle position sensor and the mass airflow sensor with no luck. We hooked up the scanner and saw no hard codes, just some erratic data from the crank sensor. After confirming the sensor and its wiring were good, we suspected the PCM. We connected a lab scope and saw the PCM was intermittently dropping the 5-volt reference signal, causing the stall. We installed a VIN-programmed module just like this one, performed the security relearn, and the Tahoe ran perfectly. It’s a classic case where chasing sensors costs more time and money than addressing the root cause: a failing engine computer.

The Direct Solution: A VIN-Programmed 2004 Rainier Engine Computer

Don’t let a faulty module keep your vehicle off the road. This is a direct-replacement PCM, service number 12586242, for a wide range of 2004 General Motors vehicles. The most critical part of this solution is our professional programming service. Before we ship your part, we flash it with the latest GM-certified software updates and calibrate it specifically to your vehicle’s unique Vehicle Identification Number (VIN). This ensures that the module communicates flawlessly with your vehicle’s existing systems, just as the original did from the factory. This process eliminates the need for expensive dealership programming and dramatically simplifies the installation process for you or your mechanic.

Common Symptoms of a Failing PCM

  • ✔ Check Engine Light: Your check engine light is illuminated, often with communication error codes (like U-codes) or internal processor failure codes (like P0600-P0606).
  • ✔ No-Start Condition: The engine cranks but will not start, or it starts and immediately stalls.
  • ✔ Poor Engine Performance: You may experience rough idling, hesitation during acceleration, random misfires, or a significant loss of power.
  • ✔ Reduced Fuel Economy: A failing PCM can’t efficiently manage the engine’s fuel-to-air ratio, leading to a noticeable drop in MPG.
  • ✔ Harsh or Erratic Shifting: The PCM also controls the transmission, and a failure can result in delayed, hard, or incorrect gear shifts.
  • ✔ Intermittent Stalling: The vehicle may stall unexpectedly while driving or when coming to a stop, often without warning.

Replacing your old, failing module with this professionally programmed 2004 Rainier Engine Computer is the most effective way to resolve these issues and restore your vehicle’s original performance and dependability. By providing us with your VIN at checkout, you ensure you receive a component that is ready for installation and configured for your exact vehicle specifications.

Please Note: While this module is programmed for plug-and-play functionality, most GM vehicles of this era require a security relearn procedure (often called a CASE relearn or Passlock relearn) after installation. This is a simple procedure that can typically be done without special tools and syncs the new PCM with your vehicle’s anti-theft system.

Frequently Asked Questions

Do I need to have this PCM programmed?

No, we handle the programming for you before shipment. You must provide your vehicle’s VIN when you place your order so we can load the correct GM software and calibrations for your specific model and options.

What is a VIN and why is it required?

The VIN (Vehicle Identification Number) is a unique 17-digit code for your vehicle. It tells us critical information like the engine size, transmission type, and emissions systems. Providing the VIN ensures we program the PCM perfectly for your vehicle’s factory setup.

Will this fix my check engine light?

If the check engine light is caused by a faulty PCM (e.g., codes P0601, P0606, or communication errors), then yes, this replacement part will solve the problem. However, if the light is on due to other failing sensors or components, those issues will still need to be addressed.

What is a CASE Relearn or Security Relearn?

This is a procedure required by your vehicle’s anti-theft system to recognize the new PCM. It typically involves a sequence of turning the ignition key on and off. Instructions are readily available online for your specific model, and it usually does not require a mechanic or special tools.

How do I find my original part number?

Your original part number is printed on a sticker on the PCM itself. For many 2004 GM trucks and SUVs, the PCM is located in the engine bay, either next to the airbox or under the battery tray. Match your number to one of the compatible service numbers listed, such as 12586242, YHTN, YFKD, etc., to ensure compatibility.

Condition

Refurbished

Year

Genuine OEM

Yes

MPN

YHTN

Interchange part number

Model

Rainier

Year

2004

Brand

GM

Manufacturer Part Number

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superseded part number

12586242 19299226 89017738 YFKD, YFKF YFKH YFKJ YFKX YFXL, YFXM YFXN YFXP YHTN

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