PowertrainP0078

Caution

Severity: Caution - get it checked when you can

Exhaust Valve Control Solenoid Circuit (Bank 1)

32 brands affected · Generic SAE J2012 description.

Key terms: Oxygen sensor: measures oxygen in the exhaust gas · Mass air flow sensor: measures the air going into the engine · Bank 1: the side of the engine containing cylinder 1 · SAE J2012: the standard generic code list · Powertrain: engine, transmission and emissions

1What it means in plain English

This code is in the fuel and air metering range, which includes fuel-pressure and camshaft-timing faults.

2Common causes

Dirty or faulty mass air flow sensor
Vacuum or intake air leak
Weak fuel pump or clogged fuel filter
Faulty fuel injector
Faulty oxygen sensor
Wiring or connector fault

3Can I drive?

Caution · drive with care

Have it diagnosed promptly. Some codes in this range affect fuel pressure or camshaft timing; if the engine loses power, runs badly, or stalls, stop safely and get professional help.

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 32

Brand	Code	Description	System
Ashok Leyland CV	P0078	Exhaust Valve Control Solenoid Circuit (Bank 1) SAE	Powertrain
BAIC Motor	P0078	Exhaust Valve Control Solenoid Circuit Bank 1 Brand	Powertrain
Mercedes-Benz	P0078	Exhaust Valve Control Solenoid Circuit (Bank 1) SAE	Powertrain
BMW	P0078	Exhaust Valve Control Solenoid Circuit B1 Brand	Powertrain
BYD	P0078	Exhaust Valve Control Solenoid Circuit Bank 1 Brand	Powertrain
Chery	P0078	Exhaust Valve Control Solenoid Circuit Bank 1 Brand	Powertrain
Daewoo	P0078	Exhaust Valve Control Solenoid Circuit Bank 1 Brand	Powertrain
DFFS	P0078	Exhaust VVT control circuit open Brand	Powertrain
DFFX	P0078	Exhaust Valve Control Solenoid Circuit Bank 1 Brand	Powertrain
DFXK	P0078	Exhaust Valve Control Solenoid Circuit Bank 1 Brand	Powertrain
EOBD	P0078	Eksosventilstyringsmagnetkrets bank 1 Brand	Powertrain
Geely	P0078	Exhaust Valve Control Solenoid Circuit Bank 1 Brand	Powertrain
GM	P0078	Exhaust Valve Control Solenoid Circuit Bank 1 Brand	Powertrain
Great Wall	P0078	Exhaust Valve Control Solenoid Circuit Bank 1 Brand	Powertrain
Hafei	P0078	Exhaust Valve Control Solenoid Circuit Bank 1 Brand	Powertrain
Holden	P0078	Exhaust Camshaft Position Actuator Solenoid Valve Circuit Open Brand	Powertrain
Honda	P0078	Exhaust Valve Control Solenoid Circuit (Bank 1) SAE	Powertrain
Hyundai	P0078	Exhaust Valve Control Solenoid Circuit (Bank 1) SAE	Powertrain
Land Rover	P0078	Exhaust Valve Control Solenoid Circuit (Bank 1) SAE	Powertrain
Mahindra	P0078	Exhaust Valve Control Solenoid Circuit (Bank 1) SAE	Powertrain
Mitsubishi	P0078	Exhaust Valve Control Solenoid Circuit (Bank 1) SAE	Powertrain
Nissan	P0078	Exhaust Valve Control Solenoid Circuit (Bank 1) SAE	Powertrain
Opel	P0078	Exhaust Valve Control Solenoid Circuit Bank 1 Brand	Powertrain
Peugeot	P0078	Exhaust Valve Control Solenoid Circuit (Bank 1) SAE	Powertrain
Porsche	P0078	Endstufe Ventilhubsteuerung Bank 1 Brand	Powertrain
Saab	P0078	Exhaust Valve Control Solenoid Circuit Bank 1 Brand	Powertrain
MG (SAIC)	P0078	Exhaust Valve Control Solenoid Circuit Brand	Powertrain
Sprinter	P0078	Exhaust Valve Control Solenoid Circuit (Bank 1) SAE	Powertrain
Suzuki	P0078	Exhaust Valve Control Solenoid Circuit (Bank 1) Brand	Powertrain
Tata	P0078	Exhaust Valve Control Solenoid Circuit Bank 1 Brand	Powertrain
Toyota	P0078	Exhaust valve control solenoid circuit open Brand	Powertrain
Volkswagen	P0078	SAE: Exhaust Valve Control Solenoid Circuit 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 P0078 and may be reported by some scan tools.

Brand	Code	Description	System
SsangYong	P007800	Exhaust Continuously Variable Valve Timing (CVVT) control valve circuit open Brand	Powertrain

6Related codes

Browse Pxxx codes or P007xx codes.