Fault code lookup

NetworkU0100

Serious

Severity: Serious - have it checked soon

Lost Communication With ECM/PCM A

43 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

One or more modules have lost contact with the engine computer. The engine computer manages the engine and transmission.

2Common causes

  1. Wiring or connector fault on the communication bus
  2. Faulty engine 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

If the car starts and drives normally, drive carefully to a workshop. If it will not start, runs badly, or stalls, stop driving and 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 43

BrandCodeDescriptionSystem
Ashok Leyland CVU0100Lost Communication With ECM/PCM A SAENetwork
BAIC MotorU0100LostCommunication with EMS BrandNetwork
Mercedes-BenzU0100Lost Communication With ECM/PCM A SAENetwork
BYDU0100CAN ECU communication failed BrandNetwork
CheryU0100Connect to EMS BrandNetwork
ChryslerU0100Lost Communication With ECM/PCM BrandNetwork
DaewooU0100Lost Communication with ECM BrandNetwork
DaihatsuU0100EFI receiving failed BrandNetwork
DFFSU0100No engine signal BrandNetwork
DFFXU0100Lost Communication With ECM/PCM A BrandNetwork
DFXKU0100Lost communication with EMS BrandNetwork
EOBDU0100Kaotatud side ECM/PCM A-ga BrandNetwork
FiatU0100Lost communication with ECM/PCM BrandNetwork
FordU0100ECM communication failure BrandNetwork
GeelyU0100ECU message timeout BrandNetwork
GMU0100Perdi Comunic con ECM/PCM A BrandNetwork
Great WallU0100CAN ECU communication failed BrandNetwork
HafeiU0100Lost Communication With ECM/PCM A BrandNetwork
HoldenU0100Lost Communication with Engine Control Module BrandNetwork
HondaU0100PA_ minus00_DS BrandNetwork
HyundaiU0100Lost Communication With ECM/PCM A SAENetwork
IsuzuU0100Lost Communication With ECM/PCM A SAENetwork
Land RoverU0100Lost communication with engine control module power train control module BrandNetwork
MahindraU0100Lost Communication With ECM/PCM A SAENetwork
MaseratiU0100Lost Communication With Electronic Control Module/Powertrain control module Missing Message BrandNetwork
MazdaU0100Lost Communication With ECM/PCM A SAENetwork
MitsubishiU0100EV-ECU CAN timeout BrandNetwork
NissanU0100Lost Communication With ECM/PCM A SAENetwork
OpelU0100Perdi Comunic con ECM/PCM A BrandNetwork
PeroduaU0100EFI receiving failed BrandNetwork
PeugeotU0100Lost Communication With ECM/PCM A SAENetwork
PorscheU0100Lost Communication With ECM/PCM A SAENetwork
ProtonU0100EV-ECU CAN timeout BrandNetwork
SaabU0100Perdió Comunic con ECM/PCM A BrandNetwork
Maxus (SAIC)U0100Lost communication with ECM BrandNetwork
MG (SAIC)U0100ECM Node Absent BrandNetwork
SmartU0100Lost Communication With ECM/PCM A SAENetwork
SprinterU0100Lost Communication With ECM/PCM A SAENetwork
SubaruU0100Lost Communication With ECM/PCM A SAENetwork
SuzukiU0100Lost Communication With ECM / PCM “A' – Missing Message BrandNetwork
TataU0100Missing Message Error With EMS BrandNetwork
ToyotaU0100Communication with EMS lost BrandNetwork
VolkswagenU0100No Communication with Control Module 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 23

These 7-character codes are manufacturer-specific variants of U0100 and may be reported by some scan tools.

BrandCodeDescriptionSystem
Mercedes-BenzU010000Timeout of ECM messages OBD BrandNetwork
SsangYongU010000Cyclic CAN messages from engine management ECU are unavailable BrandNetwork
VolvoU010000No description available Network
Mercedes-BenzU010002P-Anforderung durch Motorsteuergerät BrandNetwork
Mercedes-BenzU010007Die Kommunikation mit dem Steuergerät 'Verbrennungsmotor' hat Funktionsstörung. BrandNetwork
Mercedes-BenzU010008Kommunikationsverlust OBD mit Motorsteuergerät (ECM). Fehlende OBD Botschaft Eng_Rs_EngCtrl_AR2 - Bus Signal / Message Failures BrandNetwork
SprinterU010008No description available Network
TataU010008IVN DTC Masking For DTC Number BrandNetwork
Mercedes-BenzU010009Kommunikationsverlust OBD mit Motorsteuergerät (ECM). Fehlende OBD Botschaft EngCtrl_Stat_AR2 - Component Failures BrandNetwork
SprinterU010009No description available Network
VolvoU010031No description available Network
Mercedes-BenzU010064Communication with the control unit 'combustion engine' has a malfunction. Signal Plausibility Failure BrandNetwork
Mercedes-BenzU010082Communication with the control unit 'combustion engine' has a malfunction. Alive/Sequence counter incorrect/not updated. BrandNetwork
Mercedes-BenzU010086Communication with the control unit 'combustion engine' has a malfunction. Signal Invalid. BrandNetwork
Mercedes-BenzU010087Timeout of ECM messages BrandNetwork
SmartU010087No description available Network
SsangYongU010087CAN communication: Drive Control Unit (DCU) CAN communication error - timeout BrandNetwork
VolvoU010087No description available Network
VolvoU010093No description available Network
Mercedes-BenzU0100EESG PtMngmnt_Rq_Pr2 - Timeout Error BrandNetwork
Mercedes-BenzU0100FANo description available Network
Mercedes-BenzU0100FBNo description available Network
Mercedes-BenzU0100FFSG ECM_OBD - Timeout Error BrandNetwork

6Related codes

  • U0101 Lost Communication With Transmission Control Module
  • U0102 Lost Communication With Transfer Case Control Module
  • U0103 Lost Communication With Gear Shift Module
  • U0104 Lost Communication With Cruise Control Module
  • U0105 Lost Communication With Fuel Injector Control Module
  • U0106 Lost Communication With Glow Plug Control Module
  • U0107 Lost Communication With Throttle Actuator Control Module
  • U0108 Lost Communication With Alternative Fuel Control Module
  • U0109 Lost Communication With Fuel Pump Control Module
  • U010A Lost Communication With Exhaust Gas Recirculation Control Module A
  • U010B Lost Communication With Exhaust Gas Recirculation Control Module B
  • U010C Lost Communication With Turbocharger/Supercharger Control Module A

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