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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 94 (Engine Controls And Fuel - 2.8L (LWN) Diesel - Diagnostic Information And Procedures (3 Of 3)) >> Diagnostic Information and Procedures >> DTC P2ADA-P2ADD >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition Off, disconnect the harness connector at the B295 Reductant Quality Sensor.
  2. Ignition On.
  3. Test for less than 20 Ω between low reference terminal 3 and ground.
    • If greater than 20 Ω 
    1. Ignition Off, disconnect the X2 harness connector at the K115 Reductant Control Module.
    2. Test for less than 2 Ω in the low reference circuit end to end
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K115 Reductant Control Module.
    • Go to next step: If less than 20 Ω 
  4. Test for 4. 8-5. 2 V between 5 V reference circuit terminal 1 and ground
    • If less than 4. 8 V 
    1. Ignition Off, disconnect the X2 harness connector at the K115 Reductant Control Module.
    2. Test for less than 2 Ω in the 5 V reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • Go to next step: If less than 2 Ω
    3. Test for infinite resistance between the 5 V reference circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K115 Reductant Control Module
    • If greater than 5. 2 V 
    1. Ignition Off, disconnect the X2 harness connector at the K115 Reductant Control Module.
    2. Test for less than 1 V between the 5 V reference circuit and ground.
      • If 1 V or greater, repair the short to voltage in the circuit.
      • If less than 1 V, replace the K115 Reductant Control Module
    • Go to next step: If between 4. 8-5. 2 V 
  5. Ignition ON, test for 4. 4-4. 8 V between signal circuit terminal 2 and ground.
    • If less than 4. 4 V 
    1. Ignition Off, disconnect the X2 harness connector at the K115 Reductant Control Module.
    2. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • Go to next step: If less than 2 Ω
    3. Test for infinite resistance between the signal circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the K115 Reductant Control Module
    • If greater than 4. 8 V 
    1. Ignition Off, disconnect the X2 harness connector at the K115 Reductant Control Module.
    2. Ignition On, test for less than 1 V between the signal circuit and ground.
      • If 1 V or greater, repair the short to voltage in the circuit.
      • If less than 1 V, replace the K115 Reductant Control Module
    • Go to next step: If between 4. 4-4. 8 V 
  6. Replace the B295 Reductant Quality Sensor.
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