P205B — Reductant Tank Temperature Sensor A Circuit Range/Performance

P205B: Reductant Tank Temperature Sensor A Circuit Range/Performance — what it means, the affected system and what to check before replacing parts.

Meaning, symptoms, causes and checks

Reductant Tank Temperature Sensor A Circuit Range/Performance. Basic catalogue definition; diagnostic details have not yet been reviewed.

Affected system: Powertrain

Symptoms

  • An engine warning or a DEF-system message may be shown.
  • In some vehicles a lasting SCR sensor fault may lead to restricted performance.

Possible causes

  • The reductant-tank temperature sensor may produce implausible readings.
  • Damage, corrosion or a poor connection in the sensor wiring are other possibilities.
  • A fault in SCR control is considered only after basic sensor checks.

What to check

  • Inspect tank-sensor wiring and the connector for damage or corrosion.
  • Compare temperature live data with the approximate physical temperature at the tank.
  • Use the service manual to check circuit response before replacing the sensor or controller.

Also written as: P205B-00, P205B00 (some scan tools add the fault-type byte, e.g. -00).