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)
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What Are the Symptoms of P2647?
- VTEC engaged at all times
- Higher than normal idle RPM
- Rougher idle than usual
- Check engine light on
What Causes P2647? (Most Likely First)
- 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
Can I Still Drive with P2647?
Short distances only. P2647 is rated moderate severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.
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
How Do You Diagnose P2647?
-
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)
Which Vehicles Commonly Get P2647?
- 2006-2019 Honda Civic Si
- 2008-2020 Honda Accord
- 2007-2018 Honda CR-V
- 2010-2019 Honda Civic
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