PowertrainP1378

Caution

Severity: Caution - get it checked when you can

Cylinder 8, ignition circuit short to ground

16 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 16

Brand	Code	Description	System
BYD	P1378	NO. 121 battery voltage sampling wire loop fault Brand	Powertrain
Chery	P1378	Cylinder 8 Ignition Circuit: Short Circuit to Ground Brand	Powertrain
Daewoo	P1378	Cyl. 8,ignition circuit short to ground Brand	Powertrain
DFFS	P1378	Misfire in a certain cylinder: not characterized Brand	Powertrain
DFXK	P1378	Cylinder 8 Ignition Circuit: Short Circuit to Ground Brand	Powertrain
EOBD	P1378	Nespaľovanie Brand	Powertrain
Geely	P1378	Cylinder 8 Ignition Circuit: Short Circuit to Ground Brand	Powertrain
GM	P1378	Cyl. 8,ignition circuit short to ground Brand	Powertrain
Holden	P1378	Fuel Injector Control Module System Voltage Low Voltage Brand	Powertrain
Land Rover	P1378	No description available	Powertrain
Opel	P1378	Cyl. 8,ignition circuit short to ground Brand	Powertrain
Peugeot	P1378	No description available	Powertrain
Porsche	P1378	Ventilhubsteuerung Zylinder 8 - unterer Grenzwert unterschritten Brand	Powertrain
Saab	P1378	Cyl. 8,ignition circuit short to ground Brand	Powertrain
Subaru	P1378	No description available	Powertrain
Toyota	P1378	Cylinder 8, ignition circuit short to ground 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.

5Extended variant codes 1

These 7-character codes are manufacturer-specific variants of P1378 and may be reported by some scan tools.

Brand	Code	Description	System
Mercedes-Benz	P137800	DebEvent TypError Prio3 2Trip - BW Brand	Powertrain

6Related codes

Browse Pxxx codes or P137xx codes.