PowertrainP11B9

Caution

Severity: Caution - get it checked when you can

NO. 442 battery voltage sampling wire loop fault

5 brands affected · Description from BYD data.

Key terms: Control module: a small computer that runs one part of the car · Powertrain: engine, transmission and emissions

Safety: This code relates to the charging system. The battery may go flat and the car may stall.

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

The electrical system may fail and the battery may go flat, risking a stall. If the battery or charging warning light is on, drive straight to a workshop.

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 5

Brand	Code	Description	System
BYD	P11B9	NO. 442 battery voltage sampling wire loop fault Brand	Powertrain
DFFS	P11B9	Brake auxiliary vacuum pump activation failure Brand	Powertrain
EOBD	P11B9	Võrgu side Brand	Powertrain
Peugeot	P11B9	No description available	Powertrain
Porsche	P11B9	No description available	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 P11Bxx codes.