PowertrainP1779

Caution

Severity: Caution - get it checked when you can

Supply voltage missing

23 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 23

Brand	Code	Description	System
BYD	P1779	Gear 1 incorrect ratio Brand	Powertrain
Chery	P1779	Gear 1 incorrect ratio Brand	Powertrain
Daewoo	P1779	Load Control Brand	Powertrain
DFFX	P1779	Gear 1 incorrect ratio Brand	Powertrain
EOBD	P1779	Obvod TCIL Brand	Powertrain
Geely	P1779	Gear 1 incorrect ratio Brand	Powertrain
GM	P1779	No description available	Powertrain
Great Wall	P1779	Gear 1 incorrect ratio Brand	Powertrain
Hafei	P1779	Gear 1 incorrect ratio Brand	Powertrain
Holden	P1779	No description available	Powertrain
Hyundai	P1779	No description available	Powertrain
Isuzu	P1779	No description available	Powertrain
Land Rover	P1779	No description available	Powertrain
Mahindra	P1779	No description available	Powertrain
Maserati	P1779	No description available	Powertrain
Mitsubishi	P1779	Gear 1 incorrect ratio Brand	Powertrain
Peugeot	P1779	No description available	Powertrain
Porsche	P1779	No description available	Powertrain
Proton	P1779	Gear 1 incorrect ratio Brand	Powertrain
Saab	P1779	TCIL Circ Brand	Powertrain
Suzuki	P1779	No description available	Powertrain
Toyota	P1779	Supply voltage missing Brand	Powertrain
Volkswagen	P1779	Gearbox input shaft 1 overspeed 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 P177xx codes.