Fault code lookup

NetworkU1000

Serious

Severity: Serious - have it checked soon

CAN-No response

35 brands affected · Description from Toyota data.

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

1What it means in plain English

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

2Common causes

  1. Wiring or connector fault on the communication bus
  2. Faulty control module
  3. Low battery voltage or poor ground
  4. Water ingress in a connector or module
  5. 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 35

BrandCodeDescriptionSystem
Ashok Leyland CVU1000No description available Network
BAIC MotorU1000CAN bus fault BrandNetwork
Mercedes-BenzU1000No description available Network
BYDU1000Battery pack communication error BrandNetwork
CheryU1000CAN Bus Off BrandNetwork
DaewooU1000Class 2 Communication Malfunction BrandNetwork
DaihatsuU1000CAN communication fault 1 BrandNetwork
DFFSU1000ECU no response BrandNetwork
DFFXU1000CAN communication failure BrandNetwork
DFXKU1000CAN communication BrandNetwork
EOBDU1000OSS CAN timeout BrandNetwork
FordU1000No description available Network
GeelyU1000Message cannot be sent BrandNetwork
GMU1000Class 2 data link malfunction BrandNetwork
HoldenU1000High Speed CAN Bus BrandNetwork
HondaU1000No description available Network
HyundaiU1000No description available Network
IsuzuU1000No description available Network
Land RoverU1000No description available Network
MaseratiU1000No description available Network
MazdaU1000No description available Network
MitsubishiU1000OSS CAN timeout BrandNetwork
NissanU1000Status Mask BrandNetwork
OpelU1000Class 2 data link malfunction BrandNetwork
PeroduaU1000CAN communication fault 1 BrandNetwork
PeugeotU1000No description available Network
ProtonU1000OSS CAN timeout BrandNetwork
SaabU1000Class 2 data link malfunction BrandNetwork
MG (SAIC)U1000CAN bus off BrandNetwork
SmartU1000No description available Network
SprinterU1000No description available Network
SuzukiU1000CAN COMM CIRCUIT BrandNetwork
SWM MotorU1000CAN bus off BrandNetwork
TataU1000CAN Driver Fault BrandNetwork
ToyotaU1000CAN-No response BrandNetwork

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 3

These 7-character codes are manufacturer-specific variants of U1000 and may be reported by some scan tools.

BrandCodeDescriptionSystem
SsangYongU100000CAN communication: communication error - bus off BrandNetwork
VolvoU100000When this DTC has been set, the same output has set DTC CEM- three times BrandNetwork
SsangYongU100088CAN bus: CAN bus off BrandNetwork

6Related codes

  • U1001 CAN passive error
  • U1002 CAN line error
  • U1003 No communication with towing system control module (J345); Open circuit
  • U1004 Invalid data from towing system control module (J345)
  • U1005 CAN network
  • U1006 Low voltage detected
  • U1007 General fault on suspension and wheel CAN network
  • U1008 General fault on suspension and wheel CAN network
  • U1009 ECU silent on suspension and wheel CAN network
  • U100A No communications with control module for access/start authorization
  • U100B Semi-automatic parallel parking system
  • U100C No. 10 BMU and BMS communication abnormality

Browse Uxxx codes or U100xx codes.

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