• 12621793 12617230 Match both of these!
• Service NO: 12617230

ECU has security and requires programming before installation. We offer FREE VIN programming so the ECU arrives and your vehicle will start once a key relearn process is completed. We will send instructions on how to complete this. During chekcout, be sure to put your VIN in the "notes to seller" field, otherwise we'll message after the purchase for your VIN.

A crankshaft and throttle relearn are also recommended when replacing the ECU. A scan tool is required to complete the crank and throttle relearn. Your vehicle may not run properly if these are not completed. Be sure your mechanic is capable of completing these before purchasing.

• You must match your part numbers exactly as seen above all the way through. If any numbers are off compared to your original it will not work properly.
• ECU will require programming or coding to your vehicle or vehicle's security system and is not plug and play.
• ECU will fit Cadillac CTS 3.5L models with exact part numbers match.

ECU has been tested with our state of the art vehicle simulator which tests over 25 circuits of the ECU! Some of those are listed below:

• Reference Voltage Good!
• ECU powered up and has communication!
• ECU fuel pump/main relay test good!
• ECU injectors/coils test good and much more!

• Disconnect the negative terminal of the battery. Make sure the battery connector is not touching the battery post.
• Disconnect and remove the module to be replaced
• Install and connect the replacement module
• Connect the negative terminal of the battery
• Ecu will now need programming or coding to your vehicle

• Pins perfect, none are broken or bent

This ECM comes with a 90 day warranty from the date of purchase. Please keep a copy of your purchase record which we will send with your item.