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Home >> Jeep >> 2021 >> Compass Altitude, 4WD >> Repair and Diagnosis >> Engine Performance >> System >> 2.4L - DTCS P0197 To P0606 >> DTC Troubleshooting >> P0602-Control Module Programming Error/Not Programmed >> Theory Of Operation
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Theory Of Operation

Each Powertrain Control Module (PCM) has an internal identifier that is programmed in the memory by the manufacturer. The PCM internal identification is checked each time the ignition is turned on.