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DTC P203B (DCU) - REDUCTANT Level Sensor A Circuit Range/Performance

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P203B (DCU) - REDUCTANT LEVEL SENSOR A CIRCUIT RANGE/PERFORMANCE

Description:  This DTC sets when the reductant dosage control module detects an incorrect reading, such as RDL1 (top pin) indicating a full tank while RDL3 (bottom pin) is indicating an empty tank.
Possible Causes: 
  • RDL1 circuit open
  • RDL1 circuit short to ground
  • RDL2 circuit open
  • RDL2 circuit short to ground
  • RDL3 circuit open
  • RDL3 circuit short to ground
  • Damaged reductant level sensor
Diagnostic Aids: 
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
All GO to PINPOINT TEST RJ .
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