Hours: 07–23 daily
EN
Tune your file

TuningBot DTC Database · v4.38.5

U0209 Lost Communication With seat adjustment control module B

Generic (OBD-II) interpretation in the TuningBot DTC database.

U · NetworkNetworkOBD2

What U0209 means

U0209
Lost Communication With seat adjustment control module B Generic · network Data confidence 78%

The control module stopped receiving expected network messages from the seat adjustment control module B node on the vehicle communication bus.

Symptoms

  • Multiple warning lamps possible
  • Functions of the affected module unavailable

Possible causes

  • CAN bus wiring fault (open, short, chafed harness)
  • Faulty control module loading the bus
  • Connector or terminal corrosion
  • Power supply or ground fault of a module

Recommended checks

  • Perform a full-module scan to map which modules communicate
  • Check CAN bus resistance and voltages at the diagnostic connector
  • Inspect wiring and connectors of the affected module
  • Check module power supply and grounds
  • Disconnect suspect modules one at a time only with a documented procedure

Related and nearby codes

U02 range
U0200U0201U0202U0203U0204U0205U0206U0207U0208U020AU020BU020CU020DU0210U0211U0212U0213U0214

How to read U0209

U

Network: communication between control units.

0

Generic SAE-standard code: same meaning on every make.

209

Specific fault index within the subsystem.

Frequently asked questions about U0209

What does U0209 mean?

Lost Communication With seat adjustment control module B. The control module stopped receiving expected network messages from the seat adjustment control module B node on the vehicle communication bus.

Is U0209 generic or manufacturer-specific?

U0209 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.

Can TuningBot remove U0209 at file level?

Not guaranteed. Powertrain (P) codes can be reliably disabled in the ECU calibration, but body, chassis and network codes depend on the specific control unit and how the fault is implemented - some can be handled, some cannot. Ask for a quote and our engineers will check your file and tell you, free of charge, whether U0209 is removable in your case.

Other file services

Stage 1/2/3 TuningDPF RemovalEGR RemovalAdBlue / SCR RemovalDTC RemovalIMMO OFFSpeed Limiter (Vmax)

Understand the system behind this code: Diagnostic Strategy and DTC Logic

ECU tuningDyno-tested results by model and engine See the results →

← Search the full DTC database