How to service the Engine Control Module (ECM) on Chevrolet Trailblazer?

The first step for ecm service requires deciding whether the user needs to replace or program the eeprom. Check the ecm to verify the part installation matches requirements before unhooking the negative Battery Cable together with all engine wiring harness electrical connectors attached to the ecm. The procedure to remove the ecm and bracket assembly from intake manifold studs requires first removing ecm bracket nuts and bolts before extracting the ecm and bracket assembly from its position. Remove the ecm by taking off its bracket retainers and then dislodging it from bracket attachment. Before removing the ecm bracket the technician must remove bracket bolts as well as bracket nuts before detaching the bracket from intake manifold studs. Install the ecm bracket onto the intake manifold studs by using bolts and nuts which need to be tightened to 9 n.m (80 lb in). Place the ecm on the bracket while verifying complete retainer engagement. Reinstall the intake manifold studs with bolts and nuts that must be torqued to 9 n.m (80 lb in) when securing them. The wiring harness should be connected to the electrical connectors of ecm and to the negative Battery Cable. Programming the new ecm will be necessary after installation. A scan tool must program the engine oil lifetime estimation into the system to prevent the default 100 percent setting and force an oil change at 5000 km (3,000 mi) from the previous service.

OEM Chevrolet Trailblazer Engine Control Module

Engine Control Computer

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8 Engine Control Modules found

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Chevrolet Trailblazer PCM Part Number: 12678511
$265.60 MSRP: $538.40
You Save: $272.80 (51%)
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:
- 2007-2009 Chevrolet Trailblazer | Base, LS, LT, SS | 6 Cyl 4.2 L GAS, 8 Cyl 5.3 L GAS, 8 Cyl 6.0 L GAS
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Chevrolet Trailblazer ECM Part Number: 12726508
$193.23 MSRP: $346.62
You Save: $153.39 (45%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Module, Emission Control System
- Replaces: 12697793, 12689093
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2021-2022 Chevrolet Trailblazer | ACTIV, LS, LT, RS | 3 Cyl 1.3 L GAS
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Chevrolet Trailblazer ECM Part Number: 12725787
$283.41 MSRP: $508.39
You Save: $224.98 (45%)
Ships in 1-3 Business Days
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Product Specifications
- Other Name: Module Assembly-Engine Control (W/O Calibration); Module, Emission Control System
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2023-2024 Chevrolet Trailblazer | ACTIV, LS, LT, RS | 3 Cyl 1.3 L GAS
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Chevrolet Trailblazer ECM Part Number: 12719250
$249.31 MSRP: $447.18
You Save: $197.87 (45%)
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Product Specifications
- Other Name: Module Assembly-Engine Control (W/O Calibration); Module, Emission Control System
- Replaces: 12697426, 12680194, 12698174, 12698175, 12691559, 12711695, 12693524, 12693292, 12696017, 12703776
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2021-2024 Chevrolet Trailblazer | L, LS, LT | 3 Cyl 1.2 L GAS
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Chevrolet Trailblazer PCM Part Number: 19209820
Product Specifications
- Other Name: Module Assembly, Powertrain Control (Refurbished); ECM; Module, Emission Control System
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2006-2007 Chevrolet Trailblazer | LS, LT | 6 Cyl 4.2 L GAS
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Chevrolet Trailblazer PCM Part Number: 12596679
Product Specifications
- Other Name: Module, Emission Control System; Engine Control Module; ECM
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2006 Chevrolet Trailblazer | LS, LT, SS | 8 Cyl 5.3 L GAS, 8 Cyl 6.0 L GAS
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Chevrolet Trailblazer PCM Part Number: 19210066
Product Specifications
- Other Name: Module Assembly, Powertrain Control; Engine Control Module; ECM; Module, Emission Control System
- Replaces: 12576463, 12571178
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2002 Chevrolet Trailblazer | LS, LT, LTZ, North Face | 6 Cyl 4.2 L GAS
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Chevrolet Trailblazer PCM Part Number: 19210065
Product Specifications
- Other Name: Module Assembly, Powertrain Control; Engine Control Module; ECM; Module, Emission Control System
- Warranty: This genuine part is guaranteed by GM's factory warranty.
Fits the following Vehicles:
- 2003-2008 Chevrolet Trailblazer | Base, LS, LT, LTZ, North Face, SS | 6 Cyl 4.2 L GAS, 8 Cyl 5.3 L GAS, 8 Cyl 6.0 L GAS

Chevrolet Trailblazer Engine Control Module

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Chevrolet Trailblazer is equipped with the Engine Control Module (ECM) that is an electronic control unit of the car that controls the engine. There is a data acquisition system which operates from different sensors like the oxygen sensor, throttle position sensor so as to control the air to fuel mixture and the ignition time. This makes for smooth running of the engine and can in fact accommodate changes in the car's performance through installed programmable functions. Year on year, new and remanufactured forms of ECMs have been incorporated into the Trailblazer. The new ECMs are developed from new parts, while the refurnished units are old models that are refurbished to operate in a similar manner. Fitment is essential because the Engine Control Module is generally made with a particular vehicle model in mind, although some come with 'universal' fits which may need cutting. All in all, they are very important components that make the Trailblazer's engine more efficient and responsive.

Chevrolet Trailblazer Engine Control Module Parts Questions & Experts Answers

PCM
12678511
Q: How to service the Engine Control Module (ECM) on Chevrolet Trailblazer?
A:
The first step for ecm service requires deciding whether the user needs to replace or program the eeprom. Check the ecm to verify the part installation matches requirements before unhooking the negative Battery Cable together with all engine wiring harness electrical connectors attached to the ecm. The procedure to remove the ecm and bracket assembly from intake manifold studs requires first removing ecm bracket nuts and bolts before extracting the ecm and bracket assembly from its position. Remove the ecm by taking off its bracket retainers and then dislodging it from bracket attachment. Before removing the ecm bracket the technician must remove bracket bolts as well as bracket nuts before detaching the bracket from intake manifold studs. Install the ecm bracket onto the intake manifold studs by using bolts and nuts which need to be tightened to 9 n.m (80 lb in). Place the ecm on the bracket while verifying complete retainer engagement. Reinstall the intake manifold studs with bolts and nuts that must be torqued to 9 n.m (80 lb in) when securing them. The wiring harness should be connected to the electrical connectors of ecm and to the negative Battery Cable. Programming the new ecm will be necessary after installation. A scan tool must program the engine oil lifetime estimation into the system to prevent the default 100 percent setting and force an oil change at 5000 km (3,000 mi) from the previous service.