PowertrainP078B

Caution

Severity: Caution - get it checked when you can

Down switch stuck (head restraint)

19 brands affected · Description from Toyota data.

Key terms: Powertrain: engine, transmission and emissions

Safety: This code relates to the airbag or seat-belt restraint system. An airbag may not deploy in a crash.

1What it means in plain English

This range normally covers the transmission control system, but some manufacturers use P07-P09 codes for unrelated functions (fuel pump control, air-mix motors, lighting or windows). Check the description before assuming it is a transmission fault.

2Common causes

Low or dirty transmission fluid
Faulty shift solenoid
Faulty speed sensor
Wiring or connector fault
Internal transmission wear

3Can I drive?

Caution · drive with care

The airbag may not deploy in a crash. Have it checked by a qualified technician; do not work on airbag wiring yourself.

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 19

Brand	Code	Description	System
Ashok Leyland CV	P078B	No description available	Powertrain
BAIC Motor	P078B	Shift Timing Solenoid 'B' Range/Performance Brand	Powertrain
BYD	P078B	Shift Timing Solenoid 'B' Range/Performance Brand	Powertrain
Chery	P078B	Shift Timing Solenoid 'B' Range/Performance Brand	Powertrain
DFFS	P078B	Down switch stuck Brand	Powertrain
DFFX	P078B	Shift Timing Solenoid 'B' Range/Performance Brand	Powertrain
DFXK	P078B	Shift Timing Solenoid 'B' Range/Performance Brand	Powertrain
EOBD	P078B	Skiftetiming-solenoide 'B' område/ytelse Brand	Powertrain
Geely	P078B	Shift Timing Solenoid 'B' Range/Performance Brand	Powertrain
GM	P078B	Shift Timing Solenoid 'B' Range/Performance Brand	Powertrain
Great Wall	P078B	Shift Timing Solenoid 'B' Range/Performance Brand	Powertrain
Hafei	P078B	Shift Timing Solenoid 'B' Range/Performance Brand	Powertrain
Hyundai	P078B	No description available	Powertrain
Isuzu	P078B	No description available	Powertrain
Land Rover	P078B	Shift Timing Solenoid 'B' Range/Performance Brand	Powertrain
Peugeot	P078B	No description available	Powertrain
Saab	P078B	Shift Timing Solenoid 'B' Range/Performance Brand	Powertrain
MG (SAIC)	P078B	Shift Timing Solenoid 'B' Range/Performance Brand	Powertrain
Toyota	P078B	Down switch stuck (head restraint) 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 P078xx codes.