Restore Your Buick’s Performance and Reliability
Is your 2009-2011 Buick Lucerne experiencing frustrating issues like stalling, erratic shifting, a persistent check engine light, or even a no-start condition? These are classic signs of a failing Engine Control Module (ECM). As the central computer for your vehicle’s engine, a faulty ECM can cause a cascade of problems that are often difficult to diagnose. This isn’t just an inconvenience; it can affect fuel economy, performance, and overall vehicle safety.
We offer a straightforward, reliable solution. This is a direct-replacement engine computer, service number 12622175, that arrives at your door fully programmed to your specific vehicle. Simply provide us with your VIN during checkout, and our technicians will flash the module with the latest GM software updates. This critical step ensures seamless communication with your car’s other systems, eliminating the need for an expensive trip to the dealership for programming.
Common Signs of a Failing ECM
- ✔ Check Engine Light is illuminated with codes like P0601, P0606 (Internal Control Module Processor Error), or U0100 (Lost Communication with ECM/PCM).
- ✔ The engine cranks but refuses to start.
- ✔ Unexplained drops in fuel efficiency.
- ✔ The engine stumbles, misfires, or stalls unexpectedly.
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Intermittent electrical issues that seem to have no other cause.
Case Study: A Tricky Diagnosis
I once had a 2010 Lucerne in my bay with a maddeningly intermittent no-start condition. The owner had already replaced the battery and starter. We’d check for fuel pressure and spark—everything was fine. Then, an hour later, it wouldn’t start. After days of chasing electrical ghosts, we monitored the ECM’s power and ground feeds during a failure and found them stable. The issue was internal to the module itself; it was failing when it got warm. Replacing it with a pre-programmed 2009-2011 Lucerne Engine Module like this one solved the problem instantly. It’s a reminder that sometimes the most complex symptoms have a single, core cause.
A Straightforward Guide to Installation
Installing your new 2009-2011 Lucerne Engine Module is a manageable job for a DIYer with basic tools. For the 4.6L Lucerne, the ECM is conveniently located at the lower part of the air cleaner box assembly.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- Locate the ECM: Find the module attached to the air cleaner box in the engine bay.
- Disconnect Connectors: Carefully unlatch and remove the electrical wiring harnesses from the old ECM. Inspect the connectors for any corrosion or damage.
- Remove the Old Module: Unbolt the old ECM from its mounting bracket.
- Install the New Module: Mount your new, pre-programmed ECM in place and securely fasten it.
- Reconnect Everything: Plug the wiring harnesses firmly into the new module. Reconnect the negative battery terminal.
- Final Steps: In some cases, a security or crankshaft position sensor relearn procedure may be necessary. This can often be initiated by a specific key cycle procedure (consult your vehicle’s service manual) or with a capable scan tool.
Verified Vehicle Compatibility
This ECM, part number 12622175, is a direct replacement for a wide range of GM vehicles and is interchangeable with service numbers 12636659, 12639300, 1263605, 12628993, 12628911, 12625453, 12630464, and 12678512. Please verify your vehicle is on the list below.
LUCERNE 09-11 Electronic Control Module; (lower part of air cleaner box), 4.6L
CADILLAC:
CTS 09 Electronic Control Module; (RH front engine compartment), 6.2L
DTS 09-11 Electronic Control Module
SRX 09 Electronic Control Module; (LH engine compartment), (4.6L)
STS 09 Electronic Control Module; (LH frame rail), 4.4L or 4.6L
STS 10 Electronic Control Module; (LH frame rail), (4.6L)
XLR 09 Electronic Control Module; (RH front engine compartment)
CHEVROLET:
COLORADO 09-12 Electronic Control Module; (RH firewall)
CORVETTE 09 Electronic Control Module; (RH engine compartment), ZR1
TRAILBLAZER 09 Electronic Control Module; (LH engine), 6.0L
GMC:
CANYON 09-12 Electronic Control Module; (RH firewall)
ENVOY 09 Electronic Control Module; (LH engine), 5.3L
HUMMER:
HUMMER H3 09-10 Electronic Control Module; (RH firewall)
SAAB:
SAAB 9-7X 09 Electronic Control Module; (LH engine)
Why do you need my VIN?
Why do you need my VIN?
Your Vehicle Identification Number (VIN) allows us to program the module with the exact software and calibrations your Buick Lucerne requires. This ensures all components, from the engine to the transmission, function together correctly, just as they did from the factory.
Is this part truly plug-and-play?
Yes, because we pre-program the module to your VIN, it eliminates the most difficult step. In most cases, you can simply install it and start the vehicle. Some vehicles may require a simple key-cycle security relearn, which does not require special tools.
Will this fix my check engine light?
If the check engine light is caused by an internal failure of the old ECM (e.g., codes P0601-P0606), then this replacement module will resolve the issue. If the light is on for another reason, such as a faulty sensor, that component will still need to be addressed.
My original part number isn’t 12622175, but it’s on the interchange list. Will this work?
Absolutely. GM often updates part numbers over time. The service numbers listed (like 12636659, 12628993, etc.) are all superseded by or interchangeable with this module. As long as your vehicle and engine are on the compatibility list, this part is a guaranteed fit.
What if my vehicle still doesn’t start after installation?
First, double-check all connections and ensure the battery is fully charged. The most common follow-up step is a security relearn procedure, also known as a Passlock or anti-theft relearn. This typically involves cycling the key in the ignition and can be done without tools. This new 2009-2011 Lucerne Engine Module is tested before shipping, so the issue is likely related to the vehicle’s security system handshake.