OBD-II Trouble Code Description for P0643 Dodge

Sensor Reference Voltage “A” Circuit High

What does this mean?

OBD2 Code P0643 Dodge definition:
The ECM has detected that the 5 volt reference voltage is too high

Symptoms

Possible sumptoms of OBD code P0643 Dodge
– Engine Light ON (or Service Engine Soon Warning Light)

Causes

Possible causes of OBD code P0643 Dodge
– ECM Short circuit condition – Shorted sensor on 5 volt circuit – Failed ECM

Possible Solutions