OEM Engine Control Module (ECM) for 2006-2008 Buick, Cadillac, Chevrolet, GMC, Hummer, Pontiac, & Saturn

What to Look for When Buying This Part

• Make sure the part is compatible with your vehicle's year, make, and model.
• Check the part's condition (if buying used). Look for any signs of damage or corrosion.
• Ask about any warranty or guarantee offered by the seller.

Quality Indicators for the Available Options

| Feature | Used OEM be sure the seller has tested the part.

• Used OEM: Original equipment from the vehicle manufacturer. Offers the same performance and reliability as the original part.
• New Aftermarket: Made by a third-party manufacturer. Can be a good alternative to OEM, but quality can vary.

What's Typically Included With the Part

• The Engine Control Module (ECM) itself.
• Sometimes, mounting hardware may be included (check with the seller).

Difficulty Level and Estimated Time

• Difficulty: Medium to High
• Estimated Time: 1-3 hours

Special Tools Needed (If Any)

• Basic hand tools (sockets, wrenches, screwdrivers)
• Scan tool for reading and clearing trouble codes
• Possibly a multimeter for testing electrical connections

Critical Steps and Tips

1. Disconnect the negative battery cable before starting any work.
2. Locate the ECM (usually under the dashboard or in the engine compartment).
3. Disconnect the wiring harness connectors from the ECM.
4. Remove the old ECM and install the new one.
5. Reconnect the wiring harness connectors.
6. Reconnect the negative battery cable.
7. Use a scan tool to clear any trouble codes and program the ECM if necessary.

Whether DIY is Recommended or Professional Installation is Better

• Professional installation is recommended, especially if programming is required. If you are comfortable with electrical work and using a scan tool, you may be able to do it yourself.

Compare: Used OEM, New Aftermarket

| Feature | Used OEM help.

• Used OEM: Offers a good balance of price and reliability. These parts are genuine factory parts that have been tested and inspected.
• New Aftermarket: Provides a brand-new part built to OE specifications.

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

Replacing these parts at the same time as the ECM can help prevent repeat failures. A faulty O2 sensor, for example, can send incorrect signals to the ECM, causing it to malfunction. Replacing these parts ensures the engine system is working optimally and protects the new ECM.

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

Factors That Affect Longevity

• Proper engine maintenance
• Avoiding electrical problems
• Protecting the ECM from water damage and extreme temperatures

• Used OEM: $150 - $400
• New Aftermarket: $200 - $500
• Labor Cost: $100 - $300 (if professional installation is chosen)
• Total Job Cost: $250 - $800 (depending on the option chosen and labor costs)

Some vehicles in this range (2006-2008 Chevrolet, GMC, Hummer, Pontiac, & Saturn) have known issues with their electrical systems. Check for any Technical Service Bulletins (TSBs) related to ECM failures or electrical problems in your specific vehicle model. Some common complaints include intermittent stalling, misfires, and difficulty starting.

How to Confirm Proper Operation

• Start the engine and let it idle for a few minutes.
• Check for any warning lights on the dashboard.
• Use a scan tool to check for any new trouble codes.
• Take the vehicle for a test drive to see if it runs smoothly.

What to Look/Listen for to Verify It's Working Correctly

• The engine should start easily and idle smoothly.
• There should be no misfires or unusual noises.
• The transmission should shift smoothly (automatic transmissions).
• The check engine light should be off.

Q: Will this ECM need to be programmed?
A: In many cases, yes. Some ECMs require programming to match your vehicle's specific VIN and options. Check with a mechanic or the seller to confirm if programming is needed.

Q: How do I know if my ECM is really bad?
A: Have a mechanic diagnose the problem. They can use a scan tool and other tests to determine if the ECM is the cause of your car's issues.

Q: What happens if I install an ECM that isn't compatible with my car?
A: The engine may not start, or it may run poorly. It could also damage other components in your car. It's important to ensure the ECM is compatible with your vehicle.

Q: Is it hard to replace an ECM myself?
A: It can be challenging, especially if programming is required. Professional installation is recommended if you're not comfortable with electrical work and using a scan tool.

Q: What kind of warranty comes with a used ECM?
A: Warranty coverage varies depending on the seller. Ask about the warranty before you buy. Many sellers offer a limited warranty of 30-90 days.

OEM Part Numbers:

• GM: 12589297, 12597121, 12603892, 19210738
• Other: 12614085

Fits Years: 2006 2007 2008