BodyB3040

Caution

Severity: Caution - get it checked when you can

Communication Malfunction On W-Line

9 brands affected · Description from Daewoo data.

Key terms: Control module: a small computer that runs one part of the car

1What it means in plain English

A body system has a fault. Depending on the make, this range can include airbags and seat belts, windows, locks and climate control, and also charging, brake, oil or coolant sensors.

2Common causes

Wiring or connector fault
Faulty sensor or switch
Water or corrosion in a connector
Control module fault
Low battery voltage

3Can I drive?

Caution · drive with care

Do not assume this code is safe to drive. If it concerns the brakes, brake vacuum, charging/alternator, engine oil or coolant, have it diagnosed before driving. Airbags or seat belts may not work in a crash, and a brake or charging fault can leave the car unsafe or stranded. For convenience systems (windows, locks, climate), have it checked when convenient.

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 9

Brand	Code	Description	System
BMW	B3040	No description available	Body
Daewoo	B3040	Communication Malfunction On W-Line Brand	Body
DFFS	B3040	Security code not programmed Brand	Body
GM	B3040	No description available	Body
Holden	B3040	Immobilizer - Engine Control Module Communication Circuit Brand	Body
Opel	B3040	No description available	Body
Peugeot	B3040	No description available	Body
Saab	B3040	No description available	Body
Suzuki	B3040	W-Line Communication Failure Brand	Body

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 B3040 and may be reported by some scan tools.

Brand	Code	Description	System
SsangYong	B304000	Open or short circuit to B+ in driver mode motor actuator feedback voltage Brand	Body

6Related codes

Browse Bxxx codes or B304xx codes.