OBD Code P0641

Sensor Reference Voltage “A” Circuit/Open

What’s mean?

OBD2 Code P0641 Definition:
The Service Manual says The Engine Control Module (ECM) detects a voltage out of tolerance condition on the 5V reference 1 or 2 bus for more than 0.5 seconds.

Symptoms

Possible sumptoms of P0641
– Engine Light ON (or Service Engine Soon Warning Light)

Possible Causes

Possible causes of P0641
– ECM Short circuit condition – Shorted sensor on 5 volt circuit – Failed ECM The Error code is generally activated on detection of the following conditions: The ECM has detected the sensor 5 volt reference circuit voltage is higher or lower than expected

Possible Solutions