OEM Engine Control Module (ECM) for 2009-2015 Buick, Cadillac, Chevrolet, GMC, Hummer, & Saab

What to Look For

• Correct Application: Make sure the ECM is designed for your specific year, make, and model vehicle.
• Condition: If buying a used ECM, check for any signs of damage or corrosion.
• Warranty: Look for a warranty to protect your investment.
• Reputation: Buy from a reputable seller with good reviews.

Quality Indicators

What's Included

• The ECM unit itself.
• Sometimes, basic installation instructions are included.
• Note: Programming may be required (check with seller).

Difficulty Level and Estimated Time

• Difficulty: Moderate
• Estimated Time: 1-3 hours

Special Tools Needed

• Basic hand tools (sockets, wrenches, screwdrivers)
• OBD-II scanner
• Multimeter (optional, but recommended for troubleshooting)
• Anti-static wrist strap (recommended to prevent damage to the ECM)

Critical Steps and Tips

1. Disconnect the Battery: Always disconnect the negative battery cable before working on electrical components.
2. Locate the ECM: The ECM is typically located under the hood, under the dashboard, or under a seat. Consult your vehicle's repair manual for the exact location.
3. Disconnect the Connectors: Carefully disconnect the wiring harness connectors from the ECM.
4. Remove the Old ECM: Remove the mounting hardware and remove the old ECM.
5. Install the New ECM: Install the new ECM and secure it with the mounting hardware.
6. Reconnect the Connectors: Carefully reconnect the wiring harness connectors to the ECM.
7. Reconnect the Battery: Reconnect the negative battery cable.
8. Programming: The ECM may need to be programmed to your vehicle. This may require a trip to a qualified mechanic or dealership.

DIY or Professional Installation?

• DIY is possible if you have experience working on cars and are comfortable with electrical systems.
• Professional installation is recommended if you are not comfortable working on cars or if the ECM needs to be programmed.

Compare: Used OEM, New Aftermarket

Used OEM

Used OEM ECMs offer excellent value. These are genuine factory parts that have been tested and inspected to ensure they are in good working condition. They are available at significantly lower prices than new parts.

New Aftermarket

New aftermarket ECMs are brand new parts manufactured by third-party companies. These parts are built to meet or exceed OE specifications.

Parts Commonly Replaced or Checked

• Oxygen (O2) sensors
• Mass airflow (MAF) sensor
• Crankshaft position sensor
• Camshaft position sensor
• Spark plugs
• Ignition coils

Preventing Repeat Failures

Replacing related parts can help prevent repeat ECM failures. For example, a faulty O2 sensor can cause the ECM to miscalculate fuel trims, leading to engine problems and potentially damaging the ECM. Addressing these issues proactively can extend the life of your new ECM.

How Long This Part Normally Lasts

• An ECM can last for the entire lifespan of the vehicle, often 10-15 years or more.

Factors That Affect Longevity

• Environmental conditions (heat, moisture)
• Electrical problems in the vehicle
• Quality of the ECM itself
• Proper installation and maintenance

Budget vs Mid-Range vs Premium Options

• Used OEM: $100 - $300
• New Aftermarket: $250 - $500

Labor Cost Considerations

• Professional installation can add $100 - $300 to the total cost, depending on the shop and the complexity of the job.
• Programming may add an additional $50-$150.

Total Job Cost Estimates

• DIY (Used OEM): $100 - $300 (plus programming if needed)
• Professional Installation (Used OEM): $300 - $600 (including labor and potential programming)
• DIY (New Aftermarket): $250 - $500 (plus programming if needed)
• Professional Installation (New Aftermarket): $450 - $800 (including labor and potential programming)

Known Issues

Some 2009-2012 Buick, Cadillac, Chevrolet, GMC, Hummer, and Saab vehicles with specific engine configurations have experienced issues with ECMs related to fuel management and emissions control.

TSBs and Common Complaints

Check for any Technical Service Bulletins (TSBs) related to the ECM on your specific vehicle. Common complaints include:

• Erratic engine performance
• Difficulty passing emissions tests
• False trouble codes

How to Confirm Proper Operation

• Start the engine and let it idle.
• Check for any unusual noises or vibrations.
• Use an OBD-II scanner to check for any new trouble codes.
• Take the vehicle for a test drive.

What to Look/Listen For

• Smooth engine operation
• Proper shifting (if applicable)
• No warning lights on the dashboard
• Normal fuel economy

Q: Will this ECM need to be programmed?
A: It depends. Some ECMs are plug-and-play, while others require programming to match your vehicle's VIN and options. Check with the seller or a qualified mechanic to confirm.

Q: How do I know if my ECM is really bad?
A: Have a mechanic diagnose the problem. They can test the ECM and other components to determine the root cause of the issue.

Q: What happens if I install the wrong ECM?
A: Installing the wrong ECM can cause serious damage to your vehicle. Make sure the ECM is designed for your specific year, make, and model.

Q: Can I program the ECM myself?
A: It is possible to program an ECM yourself, but it requires specialized equipment and knowledge. It is generally recommended to have a qualified mechanic or dealership program the ECM.

Q: What is the warranty on a used ECM?
A: Warranty terms vary depending on the seller. Check the warranty information before you buy.

OEM Part Numbers:

• Other: 12625453, 12630464, 12636015, 12636659

Fits Years: 2009 2010 2011 2012 2013 2014 2015