Possible causes

– Faulty Engine Control Module (ECM)
– ECM harness is open or shorted
– ECM circuit poor electrical connection
– Shorted sensor on 5 volt circuit

When is the code detected?

The Engine Control Module (ECM) has detected the sensor 5 volt reference circuit voltage is higher or lower than expected

Symptoms

– Engine Light ON (or Service Engine Soon Warning Light)

P0641 Information for specific makes

P0641 ACURA
P0641 CHEVROLET
P0641 HONDA
P0641 HYUNDAI
P0641 ISUZU
P0641 KIA
P0641 SAAB
P0641 SUZUKI
P0641 VOLKSWAGEN
P0641 BUICK
P0641 CADILLAC
P0641 GMC
P0641 PONTIAC
P0641 SATURN