P2647 moderate

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.

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Keep driving?
Short distances only
DIY difficulty
moderate
Estimated cost
$100 - $500 (parts and labor)
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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

Step-by-Step Diagnostic Procedure

  1. Check VTEC solenoid for stuck-open condition

  2. Test VTEC circuit for short to battery voltage

  3. Inspect VTEC solenoid screen and filter

  4. Verify ECM VTEC control output

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.

Sources

This page is built from documented references. Verify against your own service info before repair work.

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