PowertrainP1390

Caution

Severity: Caution - get it checked when you can

Octane adjust service pin in use/circuit open

17 brands affected · Description from Toyota data.

Key terms: Control module: a small computer that runs one part of the car · Powertrain: engine, transmission and emissions

1What it means in plain English

The engine or powertrain control system has stored a fault that does not have specific guidance in this database yet.

2Common causes

Sensor or actuator fault
Wiring or connector fault
Vacuum or intake leak
Fuel or ignition problem
Control module fault

3Can I drive?

Caution · drive with care

Have it diagnosed promptly. If the car runs and drives normally, drive gently to a workshop. If it runs badly, stalls, overheats, loses oil pressure, or a warning light is flashing or red, stop safely and get professional help. If the code concerns the brakes, brake vacuum or brake assist, do not drive until it is checked: a hard pedal or longer stopping distance means stop.

This page gives general information. It is not professional advice. For a definite diagnosis and a repair quote, ask a qualified mechanic to inspect the car.

4Brand data 17

Brand	Code	Description	System
BYD	P1390	NO. 145 battery voltage sampling wire loop fault Brand	Powertrain
Chery	P1390	P1XXX powertrain relevant fault,defined by manufacturer Brand	Powertrain
Daewoo	P1390	Timing Belt Skipped 1 Tooth or More Brand	Powertrain
EOBD	P1390	Córas HCAC Toyota Brand	Powertrain
GM	P1390	Timing Belt Skipped 1 Tooth or More Brand	Powertrain
Holden	P1390	Left Front Wheel Speed Sensor Circuit Brand	Powertrain
Isuzu	P1390	No description available	Powertrain
Land Rover	P1390	Octane adjust service pin in use - circuit open Brand	Powertrain
Mahindra	P1390	No description available	Powertrain
Maserati	P1390	Fuel pump 3 control circuit low Brand	Powertrain
Mitsubishi	P1390	No description available	Powertrain
Opel	P1390	Timing Belt Skipped 1 Tooth or More Brand	Powertrain
Peugeot	P1390	No description available	Powertrain
Porsche	P1390	Klopfregelung Zylinder 4: Anschlag erreicht Brand	Powertrain
Saab	P1390	Timing Belt Skipped 1 Tooth or More Brand	Powertrain
Suzuki	P1390	No description available	Powertrain
Toyota	P1390	Octane adjust service pin in use/circuit open Brand	Powertrain

Legend: SAE is the generic J2012 description; Brand is text taken from that manufacturer’s data. Manufacturer rows keep the wording and language of the source data, and non-English text is tagged so screen readers pronounce it correctly.

5Related codes

Browse Pxxx codes or P139xx codes.