NetworkU029D

Serious

Severity: Serious - have it checked soon

Lost Communication With NOx Sensor A

29 brands affected · Generic SAE J2012 description.

Key terms: Control module: a small computer that runs one part of the car · SAE J2012: the standard generic code list

1What it means in plain English

Control modules in the car cannot communicate with each other over the vehicle network.

2Common causes

Wiring or connector fault on the communication bus
Faulty control module
Low battery voltage or poor ground
Water ingress in a connector or module
Aftermarket device interfering with the bus

3Can I drive?

Serious · drive with care

The car may run normally or may not run at all. If the module that has lost communication controls steering, brakes, park brake, charging or engine cooling, drive only if those systems feel normal; stop safely if the steering becomes heavy, a brake warning appears, or the engine temperature climbs. If the car will not start or runs badly, have it towed.

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 29

Brand	Code	Description	System
Ashok Leyland CV	U029D	Lost Communication With NOx Sensor A SAE	Network
BAIC Motor	U029D	Lost Communication With NOX Sensor 'A' Brand	Network
BYD	U029D	Lose communition with ESP Brand	Network
Chery	U029D	Lost Communication With NOX Sensor 'A' Brand	Network
Daewoo	U029D	Lost Communication With NOx Sensor A SAE	Network
DFFS	U029D	Lost Communication With NOX Sensor 'A' Brand	Network
DFFX	U029D	Lost Communication With NOX Sensor 'A' Brand	Network
DFXK	U029D	Lost Communication With NOX Sensor 'A' Brand	Network
EOBD	U029D	Kaotatud side NOx anduri 'A'ga Brand	Network
Ford	U029D	Lost Communication With NOx Sensor A SAE	Network
Geely	U029D	Lost Communication With NOX Sensor 'A' Brand	Network
GM	U029D	Lost Communication With NOX Sensor 'A' Brand	Network
Great Wall	U029D	Lost Communication With NOX Sensor 'A' Brand	Network
Hafei	U029D	Lost Communication With NOX Sensor 'A' Brand	Network
Holden	U029D	Lost Communication with NOx Sensor 1 Module Brand	Network
Hyundai	U029D	Lost Communication With NOx Sensor A SAE	Network
Isuzu	U029D	Lost Communication With NOx Sensor A SAE	Network
Land Rover	U029D	Lost communication with NOx sensor A Brand	Network
Maserati	U029D	Lost communication with NOx sensor module A Brand	Network
Mitsubishi	U029D	Lost Communication With NOx Sensor A SAE	Network
Opel	U029D	Lost Communication With NOX Sensor 'A Brand	Network
Peugeot	U029D	Lost Communication With NOx Sensor A SAE	Network
Saab	U029D	Lost Communication With NOX Sensor 'A' Brand	Network
Maxus (SAIC)	U029D	Lost Communication With NOX1 Brand	Network
MG (SAIC)	U029D	Lost Communication With NOX1 Brand	Network
Subaru	U029D	Lost Communication With NOx Sensor A SAE	Network
Suzuki	U029D	Error status of NXSCU node Brand	Network
Tata	U029D	Lost Communication With NOx Sensor A SAE	Network
Toyota	U029D	Lost communication with NOx sensor 'A' Brand	Network

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 U029D and may be reported by some scan tools.

Brand	Code	Description	System
SsangYong	U029D00	CAN communication: downstream NOx sensor message not received Brand	Network

6Related codes

Browse Uxxx codes or U029xx codes.