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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 92 (Engine Controls And Fuel - 2.8L (LWN) Diesel - Diagnostic Information And Procedures (1 Of 3)) >> Diagnostic Information and Procedures >> DTC P037A, P037B, or P0381 >> 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. Verify the ignition fuse that supplies voltage to the component is not open: P16 Instrument Cluster
    • If the fuse is open 
    1. Ignition/Vehicle - Off
    2. Disconnect the electrical connector: P16 Instrument Cluster
    3. Test for infinite resistance between the test points: Ignition circuit terminal 19 & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component: P16 Instrument Cluster
    • Go to next step: If the fuse is not open 
  2. Ignition/Vehicle - Off
  3. Disconnect the appropriate electrical connector: K20 Engine Control Module
  4. Ignition - On / Vehicle - In Service Mode
  5. Verify the component works as specified: Wait to Start Indicator = Off
    • If the component does not work as specified 
    1. Ignition/Vehicle - Off
    2. Test for infinite resistance between the test points: Control circuit terminal 19 X1 & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component: P16 Instrument Cluster
    • Go to next step: If the component works as specified 
  6. Ignition/Vehicle - Off
  7. Connect a 3 A fused jumper wire between the test points: Control circuit terminal 19 X1 & Ground
  8. Ignition - On / Vehicle - In Service Mode
  9. Verify the component works as specified: Wait to Start Indicator = On
    • If the component does not work as specified 
    1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
    2. Disconnect the appropriate electrical connector: P16 Instrument Cluster
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points: Control circuit terminal 19 X1 @ Control module harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
    5. Ignition/Vehicle - Off
    6. Test for less than 2 ohms between the test points: Control circuit terminal 9 @ Component harness & The other end of the circuit @ Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • Go to next step: If less than 2 ohms
    1. Test for less than 2 ohms between the test points: Ignition circuit terminal 19 @ Component harness & Output terminal @ Fuse
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component: P16 Instrument Cluster
    • Go to next step: If the component works as specified 
  10. Replace the component: K20 Engine Control Module
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