What causes P1318 on a Honda?

Failed spark plug voltage detection module on the front bank (Bank 1) Open or shorted reset wire between the front bank detection module and the ECM Corroded or loose connector pins at the front bank detection module Poor ground at the front bank voltage detection module

How do I fix P1318 on a Honda?

Confirm the code with a scan tool and check for misfire codes on the front bank Inspect the front bank voltage detection module connector and its ground Check the reset circuit between the front bank module and the ECM for an open or short Compare the front bank module signal against the factory spec Replace the front bank module if it fails testing, then clear the code and retest

P1318 The powertrain control module saw a fault in the reset circuit for the spark plug voltage detection module on the front bank

Q: What does P1318 mean on a Honda?

P1318. The powertrain control module saw a fault in the reset circuit for the spark plug voltage detection module on the front bank. The module may not reset the detection circuit and misfire detection can be affected.. 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 misfire codes guide. It covers the system and the order to check it.

What does P1318 mean on a Honda?

P1318. The powertrain control module saw a fault in the reset circuit for the spark plug voltage detection module on the front bank. The module may not reset the detection circuit and misfire detection can be affected.. This Honda-enhanced code applies to Honda and Acura models that use this code.

Common causes of P1318

Failed spark plug voltage detection module on the front bank (Bank 1)
Open or shorted reset wire between the front bank detection module and the ECM
Corroded or loose connector pins at the front bank detection module
Poor ground at the front bank voltage detection module

How to fix P1318

Confirm the code with a scan tool and check for misfire codes on the front bank
Inspect the front bank voltage detection module connector and its ground
Check the reset circuit between the front bank module and the ECM for an open or short
Compare the front bank module signal against the factory spec
Replace the front bank module if it fails testing, then clear the code and retest

Sources and review

Checked against two independent sources.
Last updated 2026-10-10.