P0642

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

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