There are many diagnostic trouble codes (DTCs), one of which is P2647. If you use a scan tool on your vehicle and a P2647 code pops up, here’s what may be happening:
Diagnostic trouble code (DTC) P2647 represents “‘A’ Rocker Arm Actuator System Stuck On.” The code is often found on Honda and Acura vehicles equipped with Variable Valve Timing & Lift Electronic Control (VTEC).
Engines with VTEC use a rocker arm actuator system to vary engine valve lift. A typical system has two camshaft profiles: one for high RPM and one for low RPM. When the engine reaches a predetermined speed, the powertrain control module (PCM) operates a solenoid valve that allows oil pressure to activate a pin assembly that locks the rocker arms together, forcing them to follow the high RPM camshaft profile. The PCM monitors an oil pressure switch to verify that the change took place. The P2647 code may show up if the actual state of the oil pressure switch is not what the PCM expects.
You can get more information that can help you understand codes like P2647 more fully in our technical discussion about VTEC.
Note: The definition of code P2647 may be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.
Many issues can cause the P2647 code to trigger. Here are some of the most common ones:
Different engine problems may be signs of a P2647 code. Here are the code’s most most common symptoms:
Using a scan tool to detect the P2647 code may be straightforward enough to do by yourself, but further diagnosis can be very technical. It’s best to get a professional to inspect your vehicle for accurate diagnosis. However, If you’d like to take a shot at it, you can check out these videos to learn what the troubleshooting process can involve:
In general, there is no one way to fix the problems signified by OBD-II trouble codes. Many professionals require extensive training and experience in automotive repair to efficiently address the issues that trigger these codes.
However, tech-savvy DIYers may feel confident enough to navigate through OBD code problems on their own. For most trouble codes, the first thing to do is inspect the issues that may be triggering the code. If you’re able to find out what’s causing the P2647 code, you can determine the next appropriate steps, with the help of a repair manual or online repair database.
Note that some vehicles may have specific repair procedures, depending on their make and model. What works to resolve a P2647 code issue in a Honda may not work for a Subaru. Make sure to have repair information on hand before attempting to troubleshoot any OBD codes.
If you need to replace the VTEC oil pressure switch or any of the parts mentioned above, don’t put off shopping for the component you need. Otherwise, the faulty part could cause issues that can trigger other trouble codes. Thankfully, you can find what you need at CarParts.com in a matter of minutes.
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Check out our catalog. Order the part you need to clear code P2647 today!
Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic. The accuracy and timeliness of the information may change from the time of publication.