What causes P1288 on a Honda?

Rocker arm oil pressure switch reading low Open in the rocker arm oil pressure switch circuit Corroded or loose switch connector pins

How do I fix P1288 on a Honda?

Confirm the code and check for related faults Inspect the switch and connector for corrosion and loose pins Measure the switch circuit for an open Verify oil pressure before condemning the switch Replace the rocker arm oil pressure switch if it fails testing Clear the code and retest

P1288 The powertrain control module saw the rocker arm oil pressure switch signal low

Q: What does P1288 mean on a Honda?

P1288. The powertrain control module saw the rocker arm oil pressure switch signal low. Cylinder deactivation may not work and the engine can run rough or lose fuel economy.. Applies to Honda and Acura models that use this code.

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

This fault is part of the Honda VTC and VTEC codes guide. It covers the system and the order to check it.

What does P1288 mean on a Honda?

P1288. The powertrain control module saw the rocker arm oil pressure switch signal low. Cylinder deactivation may not work and the engine can run rough or lose fuel economy.. This Honda-enhanced code applies to Honda and Acura models that use this code.

Common causes of P1288

Rocker arm oil pressure switch reading low
Open in the rocker arm oil pressure switch circuit
Corroded or loose switch connector pins

How to fix P1288

Confirm the code and check for related faults
Inspect the switch and connector for corrosion and loose pins
Measure the switch circuit for an open
Verify oil pressure before condemning the switch
Replace the rocker arm oil pressure switch if it fails testing
Clear the code and retest

Sources and review

Based on one independent source.
Last updated 2026-10-10.