Rocker Arm Actuator A Control Circuit High Bank 1
The P2647 code means the vehicle's onboard diagnostic system has detected: Rocker Arm Actuator A Control Circuit High Bank 1. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- moderate
- Estimated cost
- $100 - $500 (parts and labor)
Best-selling code reader on Amazon. Reads and clears check engine codes on any 1996+ vehicle. Under $30.
Essential for diagnosing sensor codes, checking voltage, and testing circuits. Under $15 and pays for itself on the first job.
Affiliate links — we earn a commission at no extra cost to you.
Common Symptoms
- VTEC engaged at all times
- Higher than normal idle RPM
- Rougher idle than usual
- Check engine light on
Probable Causes (Ranked by Likelihood)
- VTEC solenoid stuck open Very High
- Short to voltage in VTEC control circuit High
- VTEC solenoid screen clogged with debris Moderate
- ECM VTEC driver stuck high Low
Frequently Asked Questions
What happens if VTEC is always engaged?
The engine runs on the high-RPM cam profile at all times, causing a rougher idle, slightly higher fuel consumption at low RPMs, but normal high-RPM performance.
What is the VTEC solenoid screen?
A small filter screen inside the VTEC solenoid that catches debris from engine oil. A clogged screen can prevent the solenoid from closing properly.
Can I clean the VTEC solenoid instead of replacing it?
Often yes. Removing and cleaning the solenoid and its screen can restore proper operation, especially if the issue is debris-related.
Mechanics Guide Step-by-step diagnosis
Step-by-Step Diagnostic Procedure
-
Check VTEC solenoid for stuck-open condition
-
Test VTEC circuit for short to battery voltage
-
Inspect VTEC solenoid screen and filter
-
Verify ECM VTEC control output
Sources 1
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
Commonly Affected Vehicles
- 2006-2019 Honda Civic Si
- 2008-2020 Honda Accord
- 2007-2018 Honda CR-V
- 2010-2019 Honda Civic
Related Codes
Explore More
Was this helpful?
Send this to whoever is fixing the car — your mechanic, or the person asking what the light means.