P0642 OBD Code Definition:
P0642 Sensor Voltage Circuit A Low Voltage
P0642 OBD Code Description:
OBD Code P0642
Sensor Reference Voltage “A” Circuit Low
What’s mean?
OBD2 Code P0642 Definition:
The ECM has detected that the 5 volt reference voltage is too low
Symptoms
Possible sumptoms of P0642
– Engine Light ON (or Service Engine Soon Warning Light)
Possible Causes
Possible causes of P0642
– ECM Short circuit condition – Shorted sensor on 5 volt circuit – Failed ECM
Possible Solutions