Hours: 07–23 daily
EN
Tune your file

TuningBot DTC Database · v4.37.15

U0618 Lost Communication With Engine Coolant Bypass Valve D

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

U · NetworkNetworkOBD2

What U0618 means

U0618
Lost Communication With Engine Coolant Bypass Valve D Generic · network Data confidence 65%

The control module stopped receiving expected network messages from the Engine Coolant Bypass Valve D 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

U06 range
U0600U0601U0602U0603U0604U0605U0606U0607U0608U0609U060AU060BU060CU060DU060EU060FU0610U0611

How to read U0618

U

Network: communication between control units.

0

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

618

Specific fault index within the subsystem.

Frequently asked questions about U0618

What does U0618 mean?

Lost Communication With Engine Coolant Bypass Valve D. The control module stopped receiving expected network messages from the Engine Coolant Bypass Valve D node on the vehicle communication bus.

Is U0618 generic or manufacturer-specific?

U0618 is a generic OBD-II code: it has the same meaning on every make and model that follows the SAE standard.

Can TuningBot remove U0618 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 U0618 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