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P0CBF Code – Drive Motor “A” Coolant Temperature Sensor Circuit High Voltage

Overview of system:

The hybrid electronics coolant temperature sensor, a variable resistor, gauges starter/generator coolant temperature. The Starter/Generator Control Module provides 5V to the signal circuit and a ground for the low reference circuit. Resistance in the sensor shifts with coolant temperature: rising temperature lowers resistance, while falling temperature increases it.

The Starter/Generator Control Module monitors this sensor, adjusting the Starter/Generator Control Module coolant pump as necessary for cooling. This regulation is influenced by comparisons of the sensor’s signal to average stator temperature, intake air temperature, and transmission fluid temperature. This diagnostic occurs once per drive cycle after a designated vehicle OFF period.

Code P0CBF Possible Causes

  • Faulty Starter/Generator Coolant Temperature Sensor
  • Starter/Generator Coolant Temperature Sensor circuit poor electrical connection
  • Starter/Generator Coolant Temperature Sensor harness is open or shorted
  • Faulty Starter/Generator Control Module

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