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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 54 (Engine Controls And Fuel - 2.8L (LWN) Diesel - Diagnostic Information And Procedures (2 Of 3)) >> Diagnostic Information and Procedures >> DTC P1051, P20B9, P20BA-P20BC, P248A, or P248B >> Component Testing

Component 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.

Static Test

  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector : A38 Reductant Pump and Sensor Assembly
  3. Test for 1 to 2 ohms between the test points: Control terminal 9 & Low Reference terminal 11
    • If not between 1 and 2 ohms 

      Replace the component: A38 Reductant Pump and Sensor Assembly

    • Go to next step: If between 1 and 2 ohms 
  4. Test for infinite resistance between the test points: Each terminal of the component & The component's housing
    • If less than infinite resistance 

      Replace the component: A38 Reductant Pump and Sensor Assembly

    • Go to next step: If infinite resistance 
  5. All OK.
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