Rocker Arm Oil Pressure Switch ‘B’ Circuit Low Voltage


Table of contents

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

How do I fix code P2651 ACURA?

  Check the “Possible Causes” listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector’s pins.

Cost of diagnosing the P2651 ACURA code

  The cost of diagnosing the P2651 ACURA code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle’s make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.

When is the code detected

  When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the Powertrain Control Module (PCM) memory. If the malfunction returns in the next (second) drive cycle, the MIL comes on and a Confirmed DTC and the freeze data are stored.

Possible Symptoms

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

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.

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