Q: Car won't start after ECM modular replacement

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I replaced the ECM modular, but my car still doesn't start. Do I need to program the ECM modular?

You did not say why the ECU was diagnosed, but the ECU would need to be programed to your specific vehicle by a dealership. If the ECU did not fix whatever issue prompted the replacement, then the car will not start until the issue is fixed. A qualified technician would be able to diagnose why your car is not starting.

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