Is your 2000-2003 Cadillac Seville experiencing frustrating issues like a persistent check engine light, poor fuel economy, erratic shifting, or even a no-start condition? These are classic signs of a failing Powertrain Control Module (PCM), the electronic brain of your vehicle. Don’t let a faulty computer keep your luxury sedan off the road. This direct-fit PCM, part number 12573503, is the reliable solution to restore your vehicle’s performance, drivability, and engine efficiency.
We take the guesswork and hassle out of the replacement process. Unlike a generic module from a parts store or salvage yard, this unit comes pre-programmed to your vehicle’s specific Vehicle Identification Number (VIN). This means we flash it with the latest GM-certified software updates before it even leaves our facility. This critical step ensures seamless communication with your car’s other modules, anti-theft system, and unique factory settings, making the installation process as straightforward as possible.
We had a 2002 DeVille (which uses this same PCM) come into the shop on a tow truck. The owner had spent nearly a thousand dollars replacing the fuel pump and all eight ignition coils, chasing an intermittent stalling and no-start problem. The car would run fine for a day, then die without warning. After checking fuel pressure and spark, which were both intermittently failing, we hooked up our scope to the PCM’s driver circuits. We found the PCM was randomly dropping the command signals to both the fuel pump relay and the ignition control module. A new, properly programmed PCM fixed the issue instantly. The owner was frustrated about the money spent on other parts, but relieved to finally have a reliable car. It’s a classic case of symptoms pointing to multiple components, but the root cause being the central computer.
Common Symptoms of a Failing 2000-2003 Seville PCM
- ✔ Check Engine Light: The most common symptom, often with communication-related (U-codes) or performance-related (P-codes) trouble codes.
- ✔ Engine Stalling: The engine may stall unexpectedly while driving or when coming to a stop.
- ✔ No-Start Condition: The engine cranks but refuses to start due to a lack of fuel or spark command from the PCM.
- ✔ Poor Performance: Noticeable loss of power, hesitation during acceleration, and rough idling.
- ✔ Reduced Fuel Economy: The engine may run too rich or too lean, causing a significant drop in MPG.
- ✔ Harsh or Erratic Shifting: The PCM controls transmission shift points, and a failure can lead to jerky or delayed gear changes.
- ✔ Communication Errors: Your mechanic’s scan tool may be unable to communicate with the PCM.
This module is the heart of your vehicle’s management system, controlling everything from the air-fuel mixture and ignition timing to transmission shifting and emissions equipment. Over time, exposure to engine bay heat, vibrations, and electrical fluctuations can cause internal components to fail. Our replacement units are meticulously inspected and prepared to provide a dependable, long-term solution. By providing us with your VIN during checkout, you ensure that the module you receive is perfectly matched to your vehicle’s specific configuration, eliminating the need for an expensive trip to the dealership for programming.
Installation Note:
While this PCM is plug-and-play, you will need to perform a security relearn procedure after installation. This is a simple process that syncs the new PCM with your vehicle’s anti-theft system and can typically be done in your driveway without any special tools. The procedure usually involves turning the key to the ‘ON’ position for 10-15 minutes, then ‘OFF’, and repeating this cycle three times. Instructions are readily available online for your specific model.
Compatibility Information:
This module is a direct replacement for part number 12573503 and is also compatible with the following service numbers: 12562481, 12571591, 12573650. It fits the following vehicles:
- 2000-2003 Cadillac Seville (LH engine compartment)
- 2000-2003 Cadillac DeVille (LH engine compartment)
- 2000-2002 Cadillac Eldorado (LH engine compartment)
- 2001-2002 Oldsmobile Aurora (4.0L, LH engine compartment)
- 2003 Oldsmobile Aurora (LH engine compartment)
- 2006 Chevrolet SSR (Next to air box, ID 12573503)
Do I need to get this module programmed?
No. We handle the programming for you before we ship the part. Simply provide your vehicle’s VIN at checkout, and we will flash the module with the latest GM software specific to your car. This makes it ready for installation right out of the box.
Where is the PCM located on my 2000-2003 Seville?
The PCM is located in the engine bay on the driver’s side (LH side). It is typically housed within the air filter box assembly to protect it from heat and the elements. You will need to remove the air filter cover to access it.
What is a security relearn procedure?
A security relearn, often called a Passlock or Passkey relearn, is a required procedure that syncs the new PCM with your car’s anti-theft system. Without it, the car will not start. It’s a simple process that involves a sequence of key-on/key-off cycles, usually taking about 30 minutes to complete. No special tools are needed.
Will this fix my transmission problems?
It certainly can. The PCM controls the electronic solenoids that manage shifting in the transmission. If your Seville is experiencing harsh shifting, delayed shifts, or getting stuck in a gear, a faulty PCM is a very common cause. This module can resolve those issues if they are electronic in nature.
Is this a guaranteed fix for my car’s problems?
While this PCM will resolve issues directly caused by a failing computer, it is crucial to ensure your vehicle has been properly diagnosed. Problems like a bad sensor or faulty wiring can mimic PCM failure. We recommend a thorough diagnosis by a qualified technician to confirm the PCM is the root cause of your issues.