Fault code lookup

NetworkU1108

Serious

Severity: Serious - have it checked soon

No communication with engine control unit

23 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 23

BrandCodeDescriptionSystem
Mercedes-BenzU1108No description available Network
BYDU1108Meter CAN timeout BrandNetwork
CheryU1108Meter CAN timeout BrandNetwork
DaewooU1108Loss of serial communications for class 2 devices BrandNetwork
DFFSU1108CMM (engine) node is missing BrandNetwork
DFFXU1108Meter CAN timeout BrandNetwork
EOBDU1108Lysbryter BrandNetwork
GeelyU1108Meter CAN timeout BrandNetwork
GMU1108Loss of serial communications for class 2 devices BrandNetwork
Great WallU1108Meter CAN timeout BrandNetwork
HafeiU1108Meter CAN timeout BrandNetwork
HoldenU1108Lost Communication with Engine Control Module BrandNetwork
IsuzuU1108No description available Network
MahindraU1108No description available Network
MitsubishiU1108Meter CAN timeout BrandNetwork
OpelU1108Loss of serial communications for class 2 devices BrandNetwork
PeugeotU1108No description available Network
ProtonU1108Meter CAN timeout BrandNetwork
SaabU1108Loss of serial communications for class 2 devices BrandNetwork
SmartU1108No description available Network
SprinterU1108No description available Network
TataU1108No description available Network
ToyotaU1108No communication with engine control unit 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 1

These 7-character codes are manufacturer-specific variants of U1108 and may be reported by some scan tools.

BrandCodeDescriptionSystem
SsangYongU110888LIN communication: no communication - bus off BrandNetwork

6Related codes

  • U1100 Engine CAN timeout
  • U1101 Component protection active
  • U1102 F-CAN malfunction (bus off)
  • U1103 Production mode active
  • U1104 Transport mode
  • U1105 No communication with the steering angle sensor
  • U1106 Customer service mode active
  • U1107 Lost communication with hybrid power management electronic control unit 1
  • U1109 No communication with automatic transmission electronic control unit
  • U110A Lost communication with CAN C - message missing
  • U110D Lost Communication with Security Siren
  • U110E Outside air temperature sensor communication malfunction

Browse Uxxx codes or U110xx codes.

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