What causes P1390 on a Honda?

Faulty G-Sensor G-Sensor harness is open or shorted G-Sensor circuit poor electrical connection

How do I fix P1390 on a Honda?

Confirm the code with a scan tool and check for related faults Inspect the sensor and its connector for corrosion, moisture, and loose pins Check the wiring for an open or short between the sensor and the control module Test the sensor signal against the factory spec before replacing parts Replace the sensor if it fails testing, then clear codes and retest

P1390 The powertrain control module saw the G-sensor signal intermittently low

Q: What does P1390 mean on a Honda?

P1390. The powertrain control module saw the G-sensor signal intermittently low. The vehicle may not read acceleration correctly and stability control 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 ABS and VSA warning light guide. It covers the system and the order to check it.

What does P1390 mean on a Honda?

P1390. The powertrain control module saw the G-sensor signal intermittently low. The vehicle may not read acceleration correctly and stability control can be affected.. This Honda-enhanced code applies to Honda and Acura models that use this code.

Common causes of P1390

Faulty G-Sensor
G-Sensor harness is open or shorted
G-Sensor circuit poor electrical connection

How to fix P1390

Confirm the code with a scan tool and check for related faults
Inspect the sensor and its connector for corrosion, moisture, and loose pins
Check the wiring for an open or short between the sensor and the control module
Test the sensor signal against the factory spec before replacing parts
Replace the sensor if it fails testing, then clear codes and retest

Sources and review

Checked against two independent sources.
Last updated 2026-10-02.