What causes P1257 on a Honda?

Low engine oil level or degraded oil starving the VTEC system Clogged VTEC solenoid valve screen restricting oil flow Failed VTEC solenoid valve not switching cam profiles Wiring or connector fault in the VTEC solenoid circuit Wrong-viscosity oil preventing VTEC engagement

How do I fix P1257 on a Honda?

Check engine oil level and condition first, VTEC will not engage on low or dirty oil Verify the correct oil viscosity for the engine Test VTEC solenoid operation with a Honda HDS scan tool around engagement RPM Remove and clean the VTEC solenoid screen, replace the solenoid if response stays flat Inspect wiring and connectors between the solenoid and the PCM

P1257 VTEC System Malfunction

Q: What does P1257 mean on a Honda?

P1257 — VTEC System Malfunction. Applies to Civic, Accord, CR-V, Odyssey with VTEC.

Category: Powertrain - Ignition
Severity: Check Engine Light
Applies to: Civic, Accord, CR-V, Odyssey with VTEC

What does P1257 mean on a Honda?

P1257 — VTEC System Malfunction. This Honda-enhanced code applies to Civic, Accord, CR-V, Odyssey with VTEC.

Common causes of P1257

Low engine oil level or degraded oil starving the VTEC system
Clogged VTEC solenoid valve screen restricting oil flow
Failed VTEC solenoid valve not switching cam profiles
Wiring or connector fault in the VTEC solenoid circuit
Wrong-viscosity oil preventing VTEC engagement

How to fix P1257

Check engine oil level and condition first, VTEC will not engage on low or dirty oil
Verify the correct oil viscosity for the engine
Test VTEC solenoid operation with a Honda HDS scan tool around engagement RPM
Remove and clean the VTEC solenoid screen, replace the solenoid if response stays flat
Inspect wiring and connectors between the solenoid and the PCM