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ECM/PCM Power Relay Sense Circuit Low

The Engine Control Module (ECM) monitors the power inputs. The ECM sets the OBDII code when the ECM remains powered up after the ignition switch has been turned OFF.

Weak battery Low voltage while cranking
Faulty Engine Control Module (ECM) relay
Blown ECM fuse
Faulty ECM
ECM harness is open or shorted
ECM circuit poor electrical connection

Check engine light

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