P0651 LAND-ROVER – Sensor Reference Voltage ‘B’ Circuit/Open

P0651 LAND-ROVER Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P0651 LAND-ROVER Possible Causes

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

P0651 LAND-ROVER Description

The control module has 2 internal 5-volt reference buses called “5-volt reference 1″ and”5-volt reference 2”. Each reference bus provided 5-volt reference circuit for more than one sensor. Therefore, a fault condition on one 5-volt reference circuit will affect the other 5-volt reference circuits connected to the reference bus. The control module monitors the voltage on the 5-volt reference buses.