Is Your 2007 Lucerne Running Rough? The PCM Might Be the Culprit.
If you’re dealing with a persistent Check Engine Light, erratic engine behavior, poor fuel economy, or mysterious transmission shifting issues in your 2007 Buick Lucerne, a failing Powertrain Control Module (PCM) is a very likely cause. As the central computer for your vehicle, the PCM controls everything from fuel injection and ignition timing to transmission shift points and emissions systems. When it begins to fail, it can create a cascade of frustrating and difficult-to-diagnose problems. This isn’t just an inconvenience; it affects your vehicle’s reliability, performance, and safety.
The Direct-Fit Solution: Pre-Programmed for Your Vehicle
Forget expensive dealership visits and the hassle of finding a local shop willing to program a replacement module. We offer a straightforward solution with this genuine used GM PCM, part number 19210736 (interchangeable with 12605843). The critical difference is our service: before this unit ships, we flash it with the latest official GM software updates, specifically programmed to your vehicle’s unique Vehicle Identification Number (VIN). This ensures that when you receive the part, it’s ready for a simple, plug-and-play installation. It will communicate seamlessly with all the other modules in your Lucerne, restoring its original performance and efficiency.
From the Diagnostic Bay
We had a 2007 Cadillac DTS (which uses this same PCM) come into the shop with a complaint of harsh, erratic shifting. The owner had already spent over a thousand dollars replacing transmission solenoids and fluid based on another shop’s recommendation, but the problem persisted. The transmission codes were intermittent and didn’t point to a specific mechanical failure. After hooking up our professional scan tool and monitoring the data stream from the PCM, we noticed the output signals to the transmission were dropping out. We swapped in a known-good, correctly programmed PCM, and the car shifted perfectly. It was a classic case of the computer being the problem, not the expensive mechanical parts it controls. This highlights the importance of correctly diagnosing PCM failure to avoid unnecessary repairs.
Common Symptoms of a Failing 2007 Lucerne PCM
- ✔ Persistent Check Engine Light (CEL) with various trouble codes.
- ✔ Engine stalling, stumbling, or misfiring for no apparent reason.
- ✔ Noticeable decrease in fuel economy.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Vehicle entering ‘limp mode’ with reduced power.
- ✔ Complete no-start or intermittent starting issues.
- ✔ Communication errors with diagnostic scan tools.
- ✔ Failure to pass state emissions testing.
Why Choose Our Pre-Programmed 2007 Lucerne PCM?
This isn’t just a used part pulled from a salvage vehicle. It’s a fully tested and revitalized component that undergoes a rigorous process before it reaches you. The most crucial step is the VIN-specific programming. Modern vehicles have complex security systems and option configurations that are all tied to the VIN. A non-programmed module simply will not work, and in some cases, can disable the vehicle entirely. Our service bridges that gap, providing a module that is functionally identical to a new one from the dealership, but at a fraction of the cost. By providing us with your VIN at checkout, you guarantee compatibility and a smooth installation process. In most cases, a security relearn procedure may be required, which is a simple process you can often do yourself right in your driveway.
Wide-Ranging GM Compatibility
While this is a perfect solution for the 2007 Lucerne, this versatile E38-style PCM was used across a wide array of GM vehicles in 2007. This includes models like the Cadillac DTS, SRX, and STS; Chevrolet Impala, Monte Carlo, and Cobalt SS; Pontiac G6 and Solstice; Saturn Sky, Aura, and Vue, and many more. Please verify the part number 19210736 or 12605843 matches your original unit or consult the detailed fitment list to confirm compatibility with your specific vehicle and engine option.
Frequently Asked Questions
Do I need to do any programming myself?
No. We handle all the programming before shipping. We flash the module with the latest GM software and calibrate it to the specific VIN you provide. The unit arrives ready to be installed.
What is a security relearn or CASE relearn?
After installation, you may need to perform a security relearn (also known as a Passlock or anti-theft relearn) to allow your vehicle’s keys to communicate with the new PCM. This procedure is simple and typically involves a sequence of turning the key in the ignition. A Crankshaft Variation (CASE) relearn may also be needed to clear certain engine codes, which requires a capable scan tool.
Is this a new part?
No, this is a high-quality, tested, and inspected used part sourced from a salvaged vehicle. This allows us to provide a reliable, OEM component at a significant cost saving compared to a new unit from a dealer.
Where do I provide my VIN?
Please enter your 17-digit VIN in the notes section during checkout or send it to us in a message immediately after placing your order. We cannot program and ship your PCM without this information.
What if my part number is slightly different?
This listing is specifically for part number 19210736 or its direct interchange, 12605843. If your original module has a different part number, please contact us first to ensure we can provide a compatible unit for your vehicle.