What causes P1021 on a Honda?

Rocker arm control solenoid stuck energized Rocker arm oil pressure switch reading the pinned state Shorted valve pause harness holding the circuit on Low oil level or low oil pressure Restricted oil passage to the rocker arm

How do I fix P1021 on a Honda?

Confirm the code and check oil level and pressure first Inspect the valve pause connectors and harness for shorts Test the rocker arm oil pressure switch and solenoid Check for a restricted oil passage at the rocker arm Replace the failed component only after testing proves it Clear the code and retest

P1021 The powertrain control module saw the valve pause system stuck on

Q: What does P1021 mean on a Honda?

P1021. The powertrain control module saw the valve pause system stuck on. Cylinders may stay deactivated and the engine can run rough. Applies to Honda and Acura models that use this code.

Category: Powertrain - Computer and Auxiliary Controls
Severity: Check Engine Light
Applies to: Honda and Acura models that use this code

What does P1021 mean on a Honda?

P1021. The powertrain control module saw the valve pause system stuck on. Cylinders may stay deactivated and the engine can run rough. This Honda-enhanced code applies to Honda and Acura models that use this code.

Common causes of P1021

Rocker arm control solenoid stuck energized
Rocker arm oil pressure switch reading the pinned state
Shorted valve pause harness holding the circuit on
Low oil level or low oil pressure
Restricted oil passage to the rocker arm

How to fix P1021

Confirm the code and check oil level and pressure first
Inspect the valve pause connectors and harness for shorts
Test the rocker arm oil pressure switch and solenoid
Check for a restricted oil passage at the rocker arm
Replace the failed component only after testing proves it
Clear the code and retest

Sources and review

Last updated 2026-10-10.