PowertrainP078A

Caution

Severity: Caution - get it checked when you can

Up 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	P078A	No description available	Powertrain
BAIC Motor	P078A	Shift Timing Solenoid 'B' Brand	Powertrain
BYD	P078A	Shift Timing Solenoid 'B' Brand	Powertrain
Chery	P078A	Shift Timing Solenoid 'B' Brand	Powertrain
DFFS	P078A	Shift Timing Solenoid 'B' Brand	Powertrain
DFFX	P078A	Shift Timing Solenoid 'B' Brand	Powertrain
DFXK	P078A	Shift Timing Solenoid 'B' Brand	Powertrain
EOBD	P078A	Masa gear solenoid 'B' Brand	Powertrain
Geely	P078A	Shift Timing Solenoid 'B' Brand	Powertrain
GM	P078A	Shift Timing Solenoid 'B' Brand	Powertrain
Great Wall	P078A	Shift Timing Solenoid 'B' Brand	Powertrain
Hafei	P078A	Shift Timing Solenoid 'B' Brand	Powertrain
Hyundai	P078A	No description available	Powertrain
Isuzu	P078A	No description available	Powertrain
Land Rover	P078A	Shift Timing Solenoid 'B' Brand	Powertrain
Peugeot	P078A	No description available	Powertrain
Saab	P078A	Shift Timing Solenoid 'B' Brand	Powertrain
MG (SAIC)	P078A	Shift Timing Solenoid 'B' Brand	Powertrain
Toyota	P078A	Up 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.

5Extended variant codes 1

These 7-character codes are manufacturer-specific variants of P078A and may be reported by some scan tools.

Brand	Code	Description	System
SsangYong	P078A00	On-off (reverse) solenoid electrical error Brand	Powertrain

6Related codes

Browse Pxxx codes or P078xx codes.