Restore Peak Performance to Your Buick LaCrosse
Is your 2008-2009 Buick LaCrosse suffering from baffling electrical issues, a persistent Check Engine Light, or unpredictable performance? As a technician with over two decades of diagnostic experience, I’ve seen countless drivers chase symptoms by replacing perfectly good sensors, only to find the root cause was a failing Engine Control Module (ECM). The ECM is the brain of your vehicle, and when it falters, it can create a cascade of problems that are frustrating and expensive to diagnose. This is your direct, reliable solution.
This isn’t just a replacement part; it’s a complete fix. We take a genuine GM Engine Control Module and flash it with the very latest, most stable software from General Motors, specifically tailored to your vehicle using its unique VIN. This ensures that all factory performance parameters, fuel efficiency mapping, and emissions controls are restored to their original specifications. You get a component that is ready for installation right out of the box, eliminating the need for expensive dealership programming or specialized scan tools.
A Technician’s Notebook
I remember a 2008 LaCrosse 5.3L that came into my bay with a laundry list of complaints: intermittent stalling at red lights, hard shifting, and a check engine light with codes for an O2 sensor and a transmission solenoid. The owner had already spent a small fortune on parts that didn’t solve the problem. After hooking up my diagnostic scanner, I noticed the live data stream from the ECM was erratic. The voltage readings would flicker for no reason. This is a classic sign of internal ECM failure. We installed one of our VIN-programmed modules, performed the security relearn, and cleared the codes. The car ran perfectly. It’s a textbook case of how a faulty 2008-2009 LaCrosse Engine Control Module can mimic other failures, and why a reliable, correctly programmed replacement is the definitive fix.
Is Your Vehicle Showing These Symptoms?
- ✔ Persistent Check Engine Light (CEL) that won’t go away.
- ✔ Stalling, sputtering, or hesitation during acceleration.
- ✔ Noticeably poor fuel economy.
- ✔ The engine cranks but refuses to start (no-start condition).
- ✔ Harsh or erratic automatic transmission shifting.
- ✔ Communication error codes, such as U0100 (Lost Communication With ECM/PCM).
- ✔ Internal module fault codes like P0601 or P0606.
- ✔ Failure to pass state emissions testing.
A Straightforward Guide to Installation
Replacing the 2008-2009 LaCrosse Engine Control Module is a manageable job for a confident DIYer. Since we handle the programming, your main job is the physical swap.
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and wait about 10 minutes to allow the system to fully discharge.
- Locate the ECM: On the 2008-2009 LaCrosse, the ECM is typically located in the engine bay, situated in the lower part of the air cleaner housing.
- Disconnect and Remove: Carefully unplug the electrical connectors. Most have a locking tab that needs to be released. Once disconnected, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed ECM into place. Reconnect the electrical harnesses, ensuring they click securely into place.
- Reconnect Power: Reattach the negative battery terminal.
- Perform Security Relearn: Most GM vehicles require a simple key-cycle procedure to sync the new ECM with the anti-theft system. This usually involves turning the key to the ‘ON’ position for 10-15 minutes. Instructions will be included.
Verified Vehicle Compatibility
This module, part number 19210737, is a direct replacement for a wide range of GM vehicles and is interchangeable with service numbers 12590032, 12602044, 12603530, 12605843, 12607096, and 12630457. Please verify your specific model and options below:
COLORADO 08 Electronic Control Module; (RH firewall)
ENVOY 07-08 Electronic Control Module; 5.3L (LH engine)
ENVOY 08 Electronic Control Module; 4.2L (LH engine), ID 12607096
G6 09 Electronic Control Module; (LH front engine compartment), 3.6L, ID 19210737
MONTE CARLO 06 Electronic Control Module; (lower part of air cleaner box), 3.5L
XLR 09 Electronic Control Module; (RH front engine compartment), ID 12607096
AURA 08-09 Electronic Control Module; (RH firewall), 2.4L, w/hybrid
DTS 06 Electronic Control Module
DEVILLE 05 Electronic Control Module; (LH engine compartment), ID 12590032
G6 07 Electronic Control Module; (LH front engine compartment), 3.6L, ID 12605843
IMPALA 06 Electronic Control Module; (lower part of air cleaner box), 3.5L
LACROSSE 08-09 Electronic Control Module; (lower air cleaner housing), 5.3L
STS 06 Electronic Control Module; (LH frame rail), 4.4L
TRAILBLAZER 08 Electronic Control Module; (LH engine), ID 12636660
UPLANDER 09 Electronic Control Module; (LH engine compartment), (3.9L)
ISUZU ASCENDER 08 Electronic Control Module; (4.2L, LH engine), ID 19210737
SAAB 9-7X 07 Electronic Control Module; (LH engine), 8 cylinder
TRAILBLAZER 07 Electronic Control Module; (LH engine), 5.3L
ENCLAVE 08 Electronic Control Module; (behind fan shroud), ID 19210737
LUCERNE 08 Electronic Control Module; (lower part of air cleaner box), 4.6L, ID 12607096
MONTE CARLO 06 Electronic Control Module; (lower part of air cleaner box), 3.9L
RAINIER 07 Electronic Control Module; (LH engine), 5.3L
ISUZU ASCENDER 08 Electronic Control Module; (4.2L, LH engine), ID 12607096
CTS 06 Electronic Control Module; (RH engine compartment), V-Series, ID 12603530
STS 08 Electronic Control Module; (LH frame rail), 4.6L
G6 06 Electronic Control Module; (LH front engine compartment), ID 12603530
G6 08 Electronic Control Module; (LH front engine compartment), 3.6L
ION 06 Electronic Control Module; 2.4L (opt LE5)
MALIBU 06 Electronic Control Module; 3.9L
MALIBU 08 Electronic Control Module; new style (emblem in bumper cover), 2.4L, w/hybrid
RELAY 06 Electronic Control Module; (LH engine compartment), 3.9L
VUE 08-09 Electronic Control Module; 2.4L, VIN Z (8th digit, opt LAT)
OUTLOOK 08 Electronic Control Module; (behind fan shroud)
SOLSTICE 06 Electronic Control Module; (LH front frame rail)
VUE 08 Electronic Control Module; 3.6L
VUE 09 Electronic Control Module; 3.6L, VIN 7 (8th digit, opt LY7)
ACADIA 07-08 Electronic Control Module; (behind fan shroud), ID 12607096 (ECM)
AURA 08-09 Electronic Control Module; (RH firewall), 3.6L
ENVOY 08 Electronic Control Module; 4.2L (LH engine), ID 19210737
G6 07 Electronic Control Module; (LH front engine compartment), 3.6L, ID 12603530
GRAND PRIX 08 Electronic Control Module; (lower air cleaner box), 5.3L
HHR 06 Electronic Control Module; (LH rear engine compartment), 2.4L
STS 08 Electronic Control Module; (LH frame rail), 4.4L
G6 07 Electronic Control Module; (LH front engine compartment), 3.6L, ID 12590032
ISUZU I-290 08 Electronic Control Module; (RH firewall)
LUCERNE 06 Electronic Control Module; (lower part of air cleaner box), 4.6L
MALIBU 09-10 Electronic Control Module; 2.4L, w/hybrid
UPLANDER 08 Electronic Control Module; (LH engine compartment), (3.9L), ID 19210737
IMPALA 06 Electronic Control Module; (lower part of air cleaner box), 3.9L
MONTANA 06 Electronic Control Module; (LH engine compartment), (SV6), 3.9L
TRAILBLAZER 08 Electronic Control Module; (LH engine), ID 19210737
ENVOY 08 Electronic Control Module; 4.2L (LH engine), ID 12636660
G6 07 Electronic Control Module; (LH front engine compartment), 3.6L, ID 12602044
TRAILBLAZER 08 Electronic Control Module; (LH engine), ID 12607096
TRAILBLAZER 09 Electronic Control Module; (LH engine), 4.2L
CANYON 08 Electronic Control Module; (RH firewall)
COBALT 06 Electronic Control Module; (LH front engine compartment), 2.4L (VIN B, 8th digit, 4-146)
ISUZU I-370 08 Electronic Control Module; (RH firewall)
MALIBU 09 Electronic Control Module; 3.6L
SRX 08 Electronic Control Module; (LH engine compartment), (4.6L)
SAAB 9-7X 08 Electronic Control Module; (LH engine), 5.3L
ENCLAVE 08 Electronic Control Module; (behind fan shroud), ID 12607096
G6 09 Electronic Control Module; (LH front engine compartment), 3.6L, ID 12607096
IMPALA 08-09 Electronic Control Module; (lower part of air cleaner box), 5.3L
XLR 06 Electronic Control Module; (RH front engine compartment), 4.4L
XLR 08 Electronic Control Module; (RH front engine compartment)
ENVOY 09 Electronic Control Module; (LH engine), 4.2L
G6 07 Electronic Control Module; (LH front engine compartment), 3.6L, ID 12607096
G6 07 Electronic Control Module; (LH front engine compartment), 3.6L, ID 12618163
LUCERNE 08 Electronic Control Module; (lower part of air cleaner box), 4.6L, ID 19210737
MONTANA 08-09 Electronic Control Module; (LH engine compartment)
PURSUIT 06 Electronic Control Module; (LH front engine compartment), 2.4L
VUE 10 Electronic Control Module; 3.6L
ACADIA 08 Electronic Control Module; (behind fan shroud), ID 19210737 (PCM)
DTS 08 Electronic Control Module
TERRAZA 06 Electronic Control Module; (LH engine compartment), 3.9L
TRAILBLAZER 07 Electronic Control Module; (LH engine), 6.0L
SAAB 9-7X 08 Electronic Control Module; (LH engine), 6.0L
HUMMER H3 08 Electronic Control Module; (RH firewall)
MALIBU 08 Electronic Control Module; new style (emblem in bumper cover), 3.6L
UPLANDER 08 Electronic Control Module; (LH engine compartment), (3.9L), ID 12607096
UPLANDER 06 Electronic Control Module; (LH engine compartment), 3.9L
Frequently Asked Questions
Do I need to program this module?
No. We flash the module with the latest GM software using the VIN you provide during checkout. It arrives ready to be installed.
What information do you need from me?
After you purchase, we will need your vehicle’s 17-digit VIN (Vehicle Identification Number) to ensure the programming is a perfect match for your car’s factory options.
What is a ‘security relearn’ procedure?
It’s a simple process that syncs the new ECM to your vehicle’s anti-theft system. It typically involves a few key cycles and can be done in your driveway without any special tools. We include easy-to-follow instructions.
Is this part guaranteed to fit my vehicle?
Yes, as long as your vehicle is on the compatibility list above and you provide the correct VIN, we guarantee it will be the correct, programmed part for your car.