P2647 — A Rocker Arm Actuator System Stuck On Bank 1

What Does P2647 Mean?

P2647 is a diagnostic trouble code indicating: A Rocker Arm Actuator System Stuck On Bank 1. This code relates to the powertrain system. It has been reported in NHTSA complaints across 2 different vehicle models.

Symptoms of P2647

⚠️ Check engine light illuminated

Common Causes

🔍 Sensor or control module malfunction

P2647 Reports by Year

2020

1

2021

1

Real Owner Reports

From NHTSA complaint database — actual owner descriptions.

"I JUST BOUGHT THE CAR AND HAD IT 1 WEEK AND I WAS DRIVING TO WORK WHEN THE CHECK ENGINE LIGHT CAME ON SUDDENLY AND CAR STARTED MISFIRING. THIS HAPPENED RIGHT WHEN I WAS STOPPED AT A LIGHT AND TURNED ON MY A/C. 3 CODES CAME ON WHICH WERE P0420, P0139, AND P2647. I WAS TOLD I NEED TO REPROGRAM THE PO"
— Honda Accord owner, 07/17/2020

"In June 2016, my Honda CR-V 2015 broke down, lost all power, and stopped working in the middle of the road. The vehicle was towed to a Honda Dealership - Diamond Bar, CA. The Honda Mechanic diagnosed a P2138, did not solve the problem, and sent me home. The vehicle broke down once again, only for th"
— Honda Cr-V owner, 08/13/2021

Source: NHTSA Complaints Database

Most Reported Vehicles for P2647

Based on NHTSA owner complaint data.

#	Vehicle	Reports
1	HONDA ACCORD
2	HONDA CR-V

Frequently Asked Questions

Can I drive with this code?

It depends on the severity. If the vehicle runs normally, short trips are usually OK. If you notice performance issues, drivability problems, or warning lights beyond the check engine light, get it checked soon.

Will this code clear itself?

Some codes clear automatically after the underlying issue is fixed and several drive cycles pass. But the root cause must be addressed first.

How do I find the exact cause?

A code alone doesn't pinpoint the failed part. You need a diagnostic scan ($50-150 at most shops) that reads freeze frame data and live sensor readings to identify the specific component.

What To Do Next

Possible Fixes

🔧 Have the code scanned with a professional-grade scanner to read freeze frame data
🔧 Test the relevant sensor(s) with a multimeter before replacing
🔧 If DIY repair isn't feasible, get a diagnostic from a trusted mechanic ($50-150)

1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.

P2647: A Rocker Arm Actuator System Stuck On Bank 1