Is Your 2004 Cadillac CTS Running Rough or Unpredictably?
If you’re dealing with frustrating issues like a persistent check engine light, poor fuel economy, or a car that just won’t start reliably, a failing Powertrain Control Module (PCM) is often the culprit. In my 20+ years as a technician, I’ve seen how a faulty computer can turn a reliable luxury car into a source of constant headaches. It controls everything from fuel mixture and spark timing to transmission shift points, and when it fails, the symptoms can be confusing and widespread.
Common Symptoms of a Failing GM PCM:
- โ Unexplained Check Engine Light (CEL) illumination
- โ Engine stalling, stumbling, or misfiring
- โ Harsh or erratic automatic transmission shifting
- โ Complete no-start or intermittent starting problems
- โ Poor engine performance and reduced fuel efficiency
- โ Communication errors with diagnostic scan tools
- โ False trouble codes for other sensors
The Direct Solution: A VIN-Programmed 2004 CTS PCM
This isn’t just a replacement part; it’s a complete solution. We take a high-quality, tested Powertrain Control Module and professionally program it to your vehicle’s specific 17-digit Vehicle Identification Number (VIN). This critical step ensures the PCM is loaded with the latest GM factory software for your exact 2004 Cadillac CTS. This process correctly configures the module for your engine, transmission, and security system (VATS), eliminating the need for an expensive trip to the dealership for programming.
From My Shop to Your Driveway: “A customer’s 2004 CTS came in last week with a baffling issue: it would randomly refuse to shift out of first gear, but only after it was fully warmed up. No transmission codes were present. After checking the basics, we hooked up our scope to the PCM outputs. We found the signal to the shift solenoid was dropping out intermittently. A new, properly programmed PCM fixed it instantly. These modules can cause symptoms that seem completely unrelated to the engine computer, which is why a reliable, correctly configured replacement is so important.”
Plug-and-Play Installation: No Dealer Visit Required
Getting your Cadillac back to factory-spec performance is straightforward. For a 2004 CTS, the PCM is located in the engine compartment on the passenger (RH) side.
- Safety First: Disconnect the negative terminal from your vehicle’s battery.
- Locate the PCM: Find the module on the passenger side of the engine bay.
- Disconnect the Connectors: Carefully unlatch and remove the electrical harness connectors from the old module.
- Remove the Old Module: Unbolt the old PCM from its mounting bracket.
- Install the New Module: Bolt your new, pre-programmed PCM into place.
- Reconnect Everything: Firmly seat the harness connectors until they click into place, then reconnect your battery terminal. Your vehicle is now ready to start.
Guaranteed Compatibility and Fitment
This module is a direct replacement for several GM service numbers. If your original module has any of the following numbers on its label, this part is a compatible replacement. Part number 12576869 is one of many service numbers this unit replaces.
- โ 12581565
- โ IS 8125815650
- โ 12570557
- โ 12570558
- โ 12576106
- โ 12578127
- โ 8125781270
- โ 88864822
- โ 89017733
Confirmed Vehicle Applications:
While this listing is focused on the 2004 CTS, this versatile hardware is also the correct part for a wide range of other GM vehicles. Please verify your specific application:
- Cadillac CTS: 2004 (Base, ID 12581565)
- Chevrolet Corvette: 2004 (ID 12581565)
- Chevrolet & GMC Trucks (2003): Silverado, Sierra, S10, Sonoma, Blazer, Jimmy, Avalanche, Suburban, Yukon XL
- Chevrolet & GMC Vans (2003): Express, Savana, Astro, Safari
IMPORTANT: After purchase, please send us your vehicle’s VIN. We cannot ship your order until we have programmed the module.