P0643

P0643 OBD Code Definition:
P0643 Sensor Reference Voltage A Circuit High
P0643 OBD Code Description:

OBD Code P0643

Sensor Reference Voltage “A” Circuit High

What’s mean?

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

Symptoms

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

Possible Causes

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

Possible Solutions

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