Restore Your Truck’s Core Performance
The Powertrain Control Module (PCM) is the central command center of your 2004 GMC Sierra 1500. It meticulously manages critical engine and transmission functions, from fuel mixture and ignition timing to emission controls and shift patterns. When this vital component falters, it can lead to a cascade of performance issues, leaving you with an unreliable and inefficient vehicle. This replacement PCM, service number 12586242, is the definitive solution to restore your truck’s original performance and reliability.
From the Diagnostic Bay
We once had a 2004 Silverado in the shop that was a real head-scratcher. The owner had spent a fortune replacing spark plugs, coil packs, and even the fuel pump trying to solve a persistent random misfire code (P0300) and intermittent stalling. Everything seemed fine on paper. It wasn’t until we monitored the live data streams from the PCM that we noticed erratic readings from the crank sensor, even after replacing it. The issue wasn’t the sensor; it was the PCM’s inability to correctly process the signal. Installing a VIN-programmed PCM like this one resolved all the issues immediately, saving the customer from further unnecessary parts replacement.
Symptoms of a Failing 2004 Sierra 1500 PCM
A failing engine computer can manifest in various ways, often mimicking other component failures. If your truck is experiencing any of the following, a faulty PCM could be the culprit:
- ✔ Persistent Check Engine Light with communication-related trouble codes (U-codes) or multiple sensor codes.
- ✔ Unexplained drops in fuel efficiency.
- ✔ Rough or unstable engine idle.
- ✔ Engine stalling, hesitation, or stumbling during acceleration.
- ✔ Harsh, erratic, or delayed shifting from the automatic transmission.
- ✔ Complete no-start condition where the engine cranks but will not fire up.
Plug-and-Play Solution with VIN Programming
Don’t settle for a generic module that requires expensive dealership programming. We simplify the repair process by pre-programming this unit with the latest GM software updates specifically for your truck’s Vehicle Identification Number (VIN). This ensures that the 2004 Sierra 1500 PCM communicates flawlessly with your vehicle’s security system, gauges, and other electronic modules right out of the box. After providing us with your VIN upon purchase, you’ll receive a module that is ready for a straightforward installation.
This module is a direct replacement for service numbers 12586242, 19299226, 89017738, YFKD, YFKF, YFKH, YFKJ, YFKX, YFXL, YFXM, YFXN, YFXP, and YHTN. Please verify your original part number to ensure compatibility.
RAINIER 04 Electronic Control Module; 5.3L (next to air box), ID YFXL
SSR 04 Electronic Control Module; (next to air box), ID YHTN
SIERRA DENALI 04 Electronic Control Module; (LH front under battery), ID 12586242
TRAILBLAZER EXT 04 Electronic Control Module; 5.3L (next to air box), ID YFKX
ENVOY XL 04 Electronic Control Module; 5.3L (next to air box), ID YFKH
RAINIER 04 Electronic Control Module; 5.3L (next to air box), ID YFKJ
SSR 04 Electronic Control Module; (next to air box), ID YFKD
SSR 04 Electronic Control Module; (next to air box), ID YFKX
SSR 04 Electronic Control Module; (next to air box), ID YFXL
TRAILBLAZER EXT 04 Electronic Control Module; 5.3L (next to air box), ID YFXP
ENVOY XL 04 Electronic Control Module; 5.3L (next to air box), ID YFXL
RAINIER 04 Electronic Control Module; 5.3L (next to air box), ID YFXM
RAINIER 04 Electronic Control Module; 5.3L (next to air box), ID YFXN
SIERRA 1500 PICKUP 04 Electronic Control Module; (LH front under battery), w/o hybrid option; w/o 4.3L; ID 12586242
SILVERADO 3500 PICKUP 04 Electronic Control Module; (LH front under battery), gasoline, 6.0L, ID 12586242
SUBURBAN 2500 04 Electronic Control Module; (LH front under battery), 6.0L, ID 12586242
TRAILBLAZER EXT 04 Electronic Control Module; 5.3L (next to air box), ID YFXN
ENVOY XUV 04 Electronic Control Module; 5.3L (next to air box), ID YFKH
ENVOY XUV 04 Electronic Control Module; 5.3L (next to air box), ID YFXL
SSR 04 Electronic Control Module; (next to air box), ID YFKF
SSR 04 Electronic Control Module; (next to air box), ID YFKH
SSR 04 Electronic Control Module; (next to air box), ID YFXM
SSR 04 Electronic Control Module; (next to air box), ID YFXN
SILVERADO 1500 PICKUP 04 Electronic Control Module; (LH front under battery), w/o hybrid option; w/o 4.3L; ID 12586242
YUKON 04 Electronic Control Module; (LH front under battery), ID 12586242
ESCALADE 04 Electronic Control Module; (LH front under battery), ID 12586242
AVALANCHE 1500 04 Electronic Control Module; (LH front under battery), ID 12586242
HUMMER H2 04 Electronic Control Module; (LH front under battery), SUT
TAHOE 04 Electronic Control Module; (LH front under battery), ID 12586242
SUBURBAN 1500 04 Electronic Control Module; (LH front under battery), ID 12586242
YUKON XL 1500 04 Electronic Control Module; (LH front under battery), ID 12586242
YUKON XL 2500 04 Electronic Control Module; (LH front under battery), 6.0L, ID 12586242
Frequently Asked Questions
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to program the PCM with the exact software calibration your truck was built with. This ensures perfect compatibility with your engine, transmission, and all factory options, making the installation process smooth and error-free.
Is this part difficult to install?
The physical installation is straightforward for someone with basic mechanical skills. The PCM is typically located in the engine bay. After installation, a security relearn procedure may be required, which syncs the new PCM to your vehicle’s keys. This procedure can usually be done without special tools and instructions are widely available online.
What is the difference between a PCM, ECM, and ECU?
The terms are often used interchangeably. ECU (Engine Control Unit) is a general term. ECM (Engine Control Module) typically controls only engine functions. A PCM (Powertrain Control Module), like this unit for your GM truck, controls both the engine and the transmission, integrating their functions for optimal performance.
How do I find my original part number?
Your original part number is printed on a sticker on the case of your existing PCM. You will need to locate the module in your vehicle’s engine bay (usually on the driver’s side fender or near the battery) to read the label. Matching this number is the best way to guarantee compatibility.
Will this fix my check engine light?
If the check engine light is caused by a faulty PCM, then yes, this part will resolve the issue. However, the check engine light can be triggered by many other failing components. It is always best to have the codes read by a professional scanner to properly diagnose the root cause of the problem before ordering parts.