Challenger V8-57L (2010) ECM Overview - Powertrain Control Module Description
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Certain relays/solenoids
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Certain sensors
Sensor Return
SENSOR RETURN
The Sensor Return circuits are internal to the Powertrain Control Module (PCM).
Sensor Return provides a low noise ground reference for all engine control system sensors. Refer to Power Grounds for more information on engine
AND transmission PCM power grounds.