There are multiple causes for the error P2647. For this code to be triggered in your case, a mechanic must diagnose the exact cause.
VTEC oil pressure switch P2647 is a code associated with it. There are times when this code is accompanied by an inability of the VTEC to engage physically, resulting in a low or no rev limit.
Check the oil level and make sure you’re using either 5W-20 or 5W-30 oil – not higher viscosities. Next, clean out the VTEC spool valve by removing it.
It’s also a good idea to clean the oil passages with some carb cleaner after removing the oil pressure switch. Finally, it’s time to reset the computer. Replace the pressure switch if that doesn’t fix it. You can get them for $60-65. It’ll break if you over-torque it.
If you’re going to do a repair, check your oil level. Check your oil level first because low oil can cause problems with the VTEC system. You might also want to change the oil if it’s dirty or hasn’t been changed in a while.
Honda P2647 Meaning: Rocker Arm Oil Pressure Switch Circuit High Voltage
Engine Control Modules (ECM) and Powertrain Control Modules (PCM) control the VTEC oil control solenoid (VTEC solenoid valve).
As well as charging and discharging the hydraulic circuit of the VTEC mechanism for switching between Low and High valve timing.
Through the rocker arm oil pressure switch (VTEC oil pressure switch) downstream of the rocker’s arm oil control solenoid (VTEC solenoid valve), the ECM/PCM monitors the oil pressure in the hydraulic circuit of the VTEC mechanism.
An ECM/PCM command that determines the hydraulic circuit oil pressure is different from the hydraulic circuit oil pressure. Upon determining the status of the rocker arm oil pressure switch (VTEC oil pressure switch), a DTC is stored to indicate that the system is faulty.
What Are The Possible Causes Of The Code P2647 Honda?
An engine oil problem is the most common reason for the P2652 code. The factory recommends changing the engine oil before replacing any parts. The driver may experience the following symptoms as a result of this trouble code:
- A poor electrical connection exists in the circuit for the VTEC/rocker arm oil pressure switch.
- Shorted or open harness on VTEC/Rocker Arm Oil Pressure Switch
- Rocker Arm Oil Pressure Switch/VTEC (Variable Valve Timing and Lift Electronic Control) has a fault
- Failure to maintain proper engine oil levels, conditions, and pressures
What Is Code P2647 Honda’s Possible Symptoms?
A driver may experience the following symptoms as a result of this trouble code:
- When the vehicle accelerates above approximately 2500-3000 rpm, it bucks/jerks.
- During acceleration, there is hesitancy or a stumble.
- When the engine is warm, the vehicle’s engine stalls or stutters at lower RPMs
- Overall, the engine performs poorly
- An engine check light
What Repairs Can Fix The P2647 Code?
This error code can be resolved by performing the following repairs:
- A variable valve timing system needs to have its wiring or connectors repaired or replaced
- Replace the oil control valve or other components involved in variable valve timing
- Other timing components, as well as the timing belt or chain, need to be replaced
- The engine oil needs to be added or changed
Diagnose And Fix Honda P2647
Located near the oil filter on the back of the cylinder block is the Variable Timing/Lift Control oil pressure switch.
Blue/Black (BLU/BLK) wires connect the oil pressure switch to the engine. In the RUN position, the switch grounds the reference voltage from the PCM, as it is normally closed. The PCM monitors a voltage drop to determine whether the switch is closed or grounded.
Intake valve rocker arms receive oil pressure when the PCM energizes the VTEC solenoid when the engine revs reach about 2,700. A change in oil pressure triggers the VTEC oil pressure switch to open. When the voltage rises, the ECM confirms that the switch is no longer grounded.
Under low engine RPMs and when the oil pressure switch does not open at higher RPMs, the trouble code is set.
If you encounter a code at 2700 RPMs or more, ensure that the engine oil level is adequate. Take the vehicle for a test drive if the oil is low. If the oil is low, add oil, clear the code, and test the vehicle.
Common Mistakes When Diagnosing The P2647 Code
This issue can be easily caused by the low or wrong engine oil, causing other parts to be replaced in error. Therefore, the first step in diagnosing this trouble code is to check the engine oil.
How Serious Is The P2647 Code?
No matter the cause, this trouble code is serious, but if timing issues are present, it is even more serious. The engine can suffer severe damage due to this, especially concerning interference engines. Therefore, this trouble code should be diagnosed and repaired as soon as possible.
Final Words
A vehicle with this trouble code should not be driven much with this code stored, as severe engine damage may result. In addition, repair costs may increase significantly if this problem is not identified sooner rather than later.
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