Question 1

What does P2646 mean?

Accepted Answer

P2646 - Rocker Arm Actuator Control System Performance/Stuck Off (Honda). Honda-specific: The rocker arm oil pressure switch or VTEC solenoid circuit is stuck in the off position.

Question 2

What are the symptoms of P2646?

Accepted Answer

Check engine light, Loss of high-RPM power, VTEC won't engage, Rough idle possible

Question 3

What causes P2646?

Accepted Answer

Low oil level, Low oil pressure, Failed VTEC oil pressure switch, Failed VTEC solenoid, Clogged VTEC solenoid filter screen, Old/dirty oil

Question 4

How much does it cost to fix P2646?

Accepted Answer

Typical repair cost: $30-$500. Check oil level first. Then clean the VTEC solenoid screen — it clogs with oil sludge over time. The screen is a free fix if you can clean it. The pressure switch is $15-30.

P2646 — Rocker Arm Actuator Control System Performance/Stuck Off (Honda)

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Common symptoms of P2646

Common causes of P2646

Repair cost & difficulty

Vehicles commonly affected

Related trouble codes