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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (Engine Controls And Fuel - 2.8L (LWN) Diesel - Diagnostic Information And Procedures (3 Of 3)) >> Diagnostic Information and Procedures >> DTC P21C5 >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector : B212 Reductant Sensor Module
  3. Ignition - On / Vehicle - In Service Mode
  4. Test for less than 25 ohms between the test points : Low Reference circuit terminal 3 & Ground
    • If 25 ohms or greater 
    1. Disconnect the electrical connector : X2 @ K115 Reductant Control Module
    2. Test for less than 2 ohms between the test points : Low Reference circuit terminal 3 @ Component harness & Terminal 6 X2 @ Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component : K115 Reductant Control Module
    • Go to next step : If less than 25 ohms 
  5. Test for 4.8 to 5.2 V between the test points : 5 V Reference circuit terminal 1 & Low Reference circuit terminal 3
    • If less than 4.8 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector : X2 @ K115 Reductant Control Module
    3. Test for infinite resistance between the test points : 5 V Reference circuit terminal 1 @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step : If infinite resistance
    4. Test for less than 2 ohms between the test points : 5 V Reference circuit terminal 1 @ Component harness & Terminal 19 X2 @ Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component : K115 Reductant Control Module
    • If greater than 5.2 V 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector : X2 @ K115 Reductant Control Module
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points : 5 V Reference circuit terminal 1 @ Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component : K115 Reductant Control Module
    • Go to next step : If between 4.8 and 5.2 V 
  6. Ignition/Vehicle - Off
  7. Disconnect the electrical connector : B212 Reductant Sensor Module
  8. Test for infinite resistance between the test points : Signal circuit terminal 2 @ Component harness & Ground
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • Go to next step : If infinite resistance 
  9. Test for less than 2 ohms between the test points : Signal circuit terminal 2 @ Component harness & Terminal 18 X2 @ Control module harness
    • If 2 ohms or greater 

      Repair the open/high resistance in the circuit.

    • Go to next step : If 2 ohms or less 
  10. Ignition - On / Vehicle - In Service Mode
  11. Test for less than 1 V between the test points : Signal circuit terminal 2 @ Component harness & Ground
    • If 1 V or greater 

      Repair the short to voltage on the circuit.

    • Go to next step : If less than 1 V 
  12. Replace the component : B212 Reductant Sensor Module
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