P046B OBD II Trouble Code Catalyst Temperature Sensor 1/2 Correlation (Bank 2)

How to quickly diagnose, repair, and info on symptoms and causes of a P046B code that indicates a bank 2 catalyst temp sensor correlation.

Symptoms of P046B OBD II Trouble Code

  • There may be no symptoms with this code
  • Heavy black smoke from exhaust (more than usual)
  • Other DEF and catalytic converter codes
  • Reduced fuel efficiency
  • Increased exhaust emissions

Common Causes of P046B OBD II Trouble Code

  • Defective exhaust temperature sensor
  • Bad catalytic converter
  • DEF system malfunction
  • Burned or otherwise open/shorted circuits in the exhaust temperature sensor system

Severity of P046B OBD II Trouble Code

Catalyst temperature variation is crucial to reducing exhaust emissions in diesel engines. While this code may be accompanied by no drivability symptoms, from an environmental standpoint, it should be classified as severe.