PowertrainP1909

Caution

Severity: Caution - get it checked when you can

Data bus, ECM 1/2 - no signal from ECM 1

18 brands affected · Description from GM data.

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

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

Have it diagnosed promptly. If the car runs and drives normally, drive gently to a workshop. If it runs badly, stalls, overheats, loses oil pressure, or a warning light is flashing or red, stop safely and get professional help. If the code concerns the brakes, brake vacuum or brake assist, do not drive until it is checked: a hard pedal or longer stopping distance means stop.

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 18

Brand	Code	Description	System
BAIC Motor	P1909	On-board charger (CHG) internal fault Brand	Powertrain
Chery	P1909	Motor controller IGBT module failure Brand	Powertrain
Daewoo	P1909	Data bus, ECM 1/2 - no signal from ECM 1 Brand	Powertrain
DFFS	P1909	Shift lever 1 sensor output is too low Brand	Powertrain
DFXK	P1909	Temperature too low fault: level 4 Brand	Powertrain
EOBD	P1909	Niezamierzone wyłączenie biegu Brand	Powertrain
Geely	P1909	Engine Databus: Missing Message from Engine Control Module 1 Brand	Powertrain
GM	P1909	Data bus, ECM 1/2 - no signal from ECM 1 Brand	Powertrain
Great Wall	P1909	Variable Valve Lift (VVL) control motor Hall sensor implausible Brand	Powertrain
Holden	P1909	Drive Motor 2 Active Damping Phase Error Brand	Powertrain
Isuzu	P1909	No description available	Powertrain
Land Rover	P1909	Transmission fluid temperature sensor - circuit open or short Brand	Powertrain
Mahindra	P1909	No description available	Powertrain
Opel	P1909	Data bus, ECM 1/2 - no signal from ECM 1 Brand	Powertrain
Peugeot	P1909	No description available	Powertrain
Saab	P1909	Data bus, ECM 1/2 - no signal from ECM 1 Brand	Powertrain
Suzuki	P1909	Gear Box Unintended Gear Disengage Brand	Powertrain
Tata	P1909	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.

5Extended variant codes 2

These 7-character codes are manufacturer-specific variants of P1909 and may be reported by some scan tools.

Brand	Code	Description	System
Mercedes-Benz	P190900	DKL50 open load error detected Brand	Powertrain
Sprinter	P190900	DKL50 open load error detected Brand	Powertrain

6Related codes

Browse Pxxx codes or P190xx codes.