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Home >> Dodge and Ram >> 2018 >> Charger Pursuit, 5.7L Eng VIN T, 4WD >> Repair and Diagnosis >> Transmission >> Automatic Trans >> (Transmission Control Module (TCM) - Electrical Diagnostics - Nag1 Automatic Transmission) >> DTC Troubleshooting >> P0643-Sensor Reference Voltage 1 Circuit High >> Possible Causes

Possible Causes

Possible Causes
(T72) SENSOR SUPPLY VOLTAGE CIRCUIT SHORT TO VOLTAGE
(T72) SENSOR SUPPLY VOLTAGE CIRCUIT SHORT TO OTHER CIRCUITS
TRANSMISSION CONTROL MODULE

Always perform the NAG1 Pre-Diagnostic Troubleshooting procedure before proceeding. Refer to  NAG1 TCM - PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE   . 

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