How to replace the Engine Control Module (ECM) on Buick LaCrosse?

Providing Engine Control Module (ECM) replacement service begins with turning off ignition and verifying the ecm Fuse has no main relay circuit voltage. A diagnostic tool will help obtain engine oil life measurement information which needs to be programmed into the new module because the module will default to 100 percent without this data. The first step involves disconnecting the battery negative cable to remove the ecm as well as the tcm/ipc and ecm/tcm fuses which are present in the underhood Fuse block. Start by taking off the ecm connectors from both engine side (inboard) and body side (outboard) positions and then unfasten the ecm redundant ground wire and bolt before proceeding with ecm bolt removal. The ecm bracket and its bolts need to be taken away if needed during installation. After bracket removal install the bracket once again before tightening its bolts to 10 n.m (89 lb in). Install the ecm while securing it with the bolts and tighten both to 10 n.m (89 lb in). Secure the ecm redundant ground wire with its bolt by tightening to 5 n.m (44 lb in). You must connect the engine side (inboard) and body side (outboard) ecm connectors for installation and place the ecm/tcm, tcm/ipc, ecm fuses back into the underhood Fuse block. To finish the installation connect the negative Battery Cable followed by ecm programming which requires turning off ignition for at least 5 seconds prior to concluding the programming.

OEM Buick LaCrosse Engine Control Module

Engine Control Computer

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12 Engine Control Modules found

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Buick LaCrosse PCM
Part Number: 12653998
$382.20 MSRP: $776.28
You Save: $394.08 (51%)
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Product Specifications
- Other Name: Module, Emission Control System; Engine Control Module; ECM
- Replaces: 12633555
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2013-2016 Buick LaCrosse | Base, Leather, Premium, Sport Touring, Touring | 4 Cyl 2.4 L MILD HYBRID EV-GAS (MHEV), 6 Cyl 3.6 L FLEX, 6 Cyl 3.6 L GAS
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Buick LaCrosse PCM
Part Number: 12651994
$450.23 MSRP: $914.44
You Save: $464.21 (51%)
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Product Specifications
- Other Name: Module, Emission Control System; Engine Control Module; ECM
- Replaces: 12643248
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2014-2015, 2012 Buick LaCrosse | Base, Convenience, Leather, Premium, Touring | 4 Cyl 2.4 L MILD HYBRID EV-GAS (MHEV), 6 Cyl 3.6 L FLEX
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Buick LaCrosse ECM
Part Number: 12651993
$371.61 MSRP: $754.76
You Save: $383.15 (51%)
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Product Specifications
- Other Name: Module, Engine Control (W/2ND Mpu); Engine Control Module; Module, Emission Control System
- Replaces: 12616889, 12650256, 12642665, 12637106
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2010-2011 Buick LaCrosse | CX, CXL | 4 Cyl 2.4 L GAS, 6 Cyl 3.0 L GAS
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Buick LaCrosse PCM
Part Number: 19300014
$1096.74 MSRP: $1737.11
You Save: $640.37 (37%)
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Product Specifications
- Other Name: Module, Emission Control System; Engine Control Module; ECM
- Replaces: 19300015
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2010-2011 Buick LaCrosse | CX, CXL, CXS | 6 Cyl 3.6 L GAS
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Buick LaCrosse ECM
Part Number: 19260507
$609.23 MSRP: $1080.78
You Save: $471.55 (44%)
Ships in 1-2 Business Days
ADD TO CART
Product Specifications
- Other Name: Module, Emission Control System; Engine Control Module
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2005-2008 Buick LaCrosse | CXS | 6 Cyl 3.6 L GAS
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Buick LaCrosse PCM
Part Number: 12678511
$191.75 MSRP: $538.40
You Save: $346.65 (65%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Module Assembly-Engine Control (W/2ND Mpu); Engine Control Module; ECM; Module, Emission Control System
- Replaces: 12636660, 12607096
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2008-2009 Buick LaCrosse | Super | 8 Cyl 5.3 L GAS
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Buick LaCrosse PCM
Part Number: 12600930
$370.61 MSRP: $693.28
You Save: $322.67 (47%)
Ships in 1-2 Business Days
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Product Specifications
- Other Name: Module Assembly-Powertrain Control (P05 No-Start PCM) (New); Engine Control Module; ECM; Module, Emission Control System
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2007-2009 Buick LaCrosse | CX, CXL | 6 Cyl 3.8 L GAS
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Buick LaCrosse ECM
Part Number: 12700116
$186.94 MSRP: $345.89
You Save: $158.95 (46%)
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Product Specifications
- Other Name: Module Assembly-Engine Control (W/2ND Mpu) E80 Service No Start.; Engine Control Module; Module, Emission Control System
- Replaces: 12669908, 12687467
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2018-2019 Buick LaCrosse | Base, Essence, Preferred, Premium | 4 Cyl 2.5 L MILD HYBRID EV-GAS (MHEV)
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Buick LaCrosse ECM
Part Number: 12725663
$229.77 MSRP: $466.68
You Save: $236.91 (51%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Module Assembly-Engine Control (W/2ND Mpu); Module, Emission Control System
- Replaces: 12683348, 12679078, 12659039, 12708794, 12698026, 12687296
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2017-2019 Buick LaCrosse | Avenir, Base, Essence, Preferred, Premium, Sport Touring | 6 Cyl 3.6 L GAS
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Buick LaCrosse Control Module
Part Number: 23159968
Product Specifications
- Other Name: Battery Assembly; Battery; Module
- Replaced by: 24279541
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2012 Buick LaCrosse | Base, Convenience, Leather, Premium, Touring | 4 Cyl 2.4 L MILD HYBRID EV-GAS (MHEV), 6 Cyl 3.6 L FLEX
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Buick LaCrosse PCM
Part Number: 19210068
Product Specifications
- Other Name: Module Assembly, Powertrain Control; Engine Control Module; ECM
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2005-2006 Buick LaCrosse | CX, CXL | 6 Cyl 3.8 L GAS
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Buick LaCrosse Control Module
Part Number: 24279540
Product Specifications
- Other Name: Module Assembly-Generator Control & Battery (New Domestic); Battery Assembly; Module; Module, Engine Electrical; Battery
- Replaces: 23102217, 23159967, 23346806, 22948845, 23211190
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2013-2015 Buick LaCrosse | Base, Leather, Premium, Touring | 4 Cyl 2.4 L MILD HYBRID EV-GAS (MHEV), 6 Cyl 3.6 L FLEX

Buick LaCrosse Engine Control Module

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Buick LaCrosse Engine Control Module Parts Questions & Experts Answers

PCM
12600930
Q: How to replace the Engine Control Module (ECM) on Buick LaCrosse?
A: Providing Engine Control Module (ECM) replacement service begins with turning off ignition and verifying the ecm Fuse has no main relay circuit voltage. A diagnostic tool will help obtain engine oil life measurement information which needs to be programmed into the new module because the module will default to 100 percent without this data. The first step involves disconnecting the battery negative cable to remove the ecm as well as the tcm/ipc and ecm/tcm fuses which are present in the underhood Fuse block. Start by taking off the ecm connectors from both engine side (inboard) and body side (outboard) positions and then unfasten the ecm redundant ground wire and bolt before proceeding with ecm bolt removal. The ecm bracket and its bolts need to be taken away if needed during installation. After bracket removal install the bracket once again before tightening its bolts to 10 n.m (89 lb in). Install the ecm while securing it with the bolts and tighten both to 10 n.m (89 lb in). Secure the ecm redundant ground wire with its bolt by tightening to 5 n.m (44 lb in). You must connect the engine side (inboard) and body side (outboard) ecm connectors for installation and place the ecm/tcm, tcm/ipc, ecm fuses back into the underhood Fuse block. To finish the installation connect the negative Battery Cable followed by ecm programming which requires turning off ignition for at least 5 seconds prior to concluding the programming.

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