Is your Cadillac Deville, Seville, or Aurora suffering from frustrating and unpredictable electronic issues? A failing Powertrain Control Module (PCM), the central computer of your vehicle, is often the culprit behind problems like a persistent Check Engine Light, poor engine performance, erratic shifting, or even a no-start condition. Instead of facing a costly and time-consuming trip to the dealership, get the reliable, direct-fit solution that arrives ready for installation.
This is a genuine GM Powertrain Control Module, service number 12573503, which is the direct replacement for part numbers including 12562481, 12571591, and 12573650. The most significant benefit we offer is our professional programming service. Before we ship the part, we flash it with the latest GM-certified software updates, precisely matched to your car’s unique Vehicle Identification Number (VIN). This means no extra programming or expensive scan tools are required on your end. It’s the closest you can get to a plug-and-play fix for your vehicle’s brain.
Is Your Cadillac Showing These Symptoms?
- ✔ Persistent Check Engine Light (CEL) that won’t go away.
- ✔ Stored diagnostic trouble codes (DTCs) like P0601 (Internal Control Module Memory Check Sum Error) or P0606 (PCM Processor Fault).
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained stalling or rough idling.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh or delayed automatic transmission shifting.
- ✔ Communication errors with other vehicle modules.
Case Study: A Tricky Diagnosis
I remember a 2002 Cadillac Deville that came into my shop on a tow truck. The owner was frustrated because it had an intermittent no-start condition that two other shops couldn’t solve. It would start fine for a week, then suddenly refuse to crank. We checked all the usual suspects—battery, starter, ignition switch—and they were all fine. When we finally managed to get it to fail in the bay, our high-end scanner couldn’t communicate with the engine computer. That was the key. The internal circuitry of the original 2000-2003 Deville PCM was failing intermittently, causing a complete communication breakdown. A new, correctly programmed PCM fixed the issue for good. It’s a classic example of how a failing module can mimic other mechanical problems.
A Straightforward Guide to Installation
- ✔ Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental contact.
- ✔ Locate the PCM: On most 2000-2003 Deville, Seville, and Eldorado models, the PCM is located in the engine compartment on the driver’s side (LH side), often near the air filter housing.
- ✔ Disconnect Connectors: Carefully release the locking tabs on the electrical wiring harnesses and gently pull them straight out from the module. Never force them.
- ✔ Remove the Old Module: Unbolt the mounting hardware that secures the old PCM to its bracket. Note the orientation of the module before removing it completely.
- ✔ Install the New Module: Mount your new, pre-programmed PCM in the same position and secure it with the original hardware.
- ✔ Reconnect Everything: Firmly plug the wiring harnesses back into the new module until they click into place. Reconnect the negative battery terminal.
- ✔ Perform Security Relearn: You will likely need to perform a simple key-on/key-off security relearn procedure to sync the new PCM with your vehicle’s anti-theft system. This typically takes 30 minutes and requires no special tools (see FAQ).
Guaranteed Vehicle Compatibility
This module is a verified fit for the following vehicles. Please ensure your vehicle and options match the list below. The part number on your original module should be one of the service numbers listed, such as 12562481.
- ✔ Cadillac Deville: 2000, 2001, 2002, 2003 (Electronic Control Module; LH engine compartment)
- ✔ Cadillac Seville: 2000, 2001, 2002, 2003 (Electronic Control Module; LH engine compartment)
- ✔ Cadillac Eldorado: 2000, 2001, 2002 (Electronic Control Module; LH engine compartment)
- ✔ Oldsmobile Aurora: 2001, 2002 (Electronic Control Module; LH engine compartment, 4.0L)
- ✔ Oldsmobile Aurora: 2003 (Electronic Control Module)
- ✔ Chevrolet SSR: 2006 (Electronic Control Module; next to air box, ID 12573503)
Frequently Asked Questions
Do I need to do anything after I buy this?
Yes. After your purchase, you MUST send us your vehicle’s 17-digit VIN. We cannot program and ship your module without it. Please double-check the VIN for accuracy before sending.
Is any additional programming required after installation?
No. This PCM comes fully programmed with the latest GM software for your specific VIN. However, you will need to perform a simple security relearn procedure, which involves turning the key to the ‘ON’ position for 10 minutes, then ‘OFF’, and repeating this cycle three times. This syncs the module to your car’s anti-theft system.
How do I find my original part number?
The part number, often labeled as “SERV.NO,” is printed on a sticker on your original PCM. It should match one of the numbers in our compatible list, such as 12562481 or 12573503.
Will this fix my car’s specific problem?
This part corrects issues directly caused by a faulty PCM. While it resolves a wide range of common symptoms, we always recommend a proper diagnosis by a qualified mechanic to confirm the PCM is the root cause before ordering.
What if I have a different engine, like the 4.0L in the Aurora?
Our programming is VIN-specific. As long as your vehicle is on the compatibility list, we will program the module with the correct software for your exact engine and transmission configuration.