P2651 ACURA – Rocker Arm Oil Pressure Switch ‘B’ Circuit Low Voltage

P2651 ACURA Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P2651 ACURA Possible Causes

Check engine oil level and pressure,Faulty VTEC Oil Pressure Switch,VTEC Oil Pressure Switch harness is open or shorted,VTEC Oil Pressure Switch circuit poor electrical connection

P2651 ACURA Description

The VTEC system activates rocker arm oil control solenoid B by command from the Powertrain Control Module (PCM), and it charges/discharges the hydraulic circuit of the VTEC mechanism that switches valve timing between Low and High. The PCM monitors oil pressure in the hydraulic circuit of the VTEC mechanism using rocker arm oil pressure switch B downstream of rocker arm oil control solenoid B. If there is a difference between the oil pressure condition in the hydraulic circuit determined by the PCM command and the oil pressure condition determined by the status of rocker arm oil pressure switch B, the system is considered faulty, and a DTC is stored.