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Home >> Chevrolet >> 2022 >> Tahoe PPV, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 13 (Engine Controls And Fuel - 3.0L (Lm2) Diesel - Diagnostic Information And Procedures (4 Of 5)) >> Diagnostic Information and Procedures >> DTC P21CB >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector: K115 Reductant Control Module
  3. Test for battery voltage between the test points: B+ circuit terminal 1 & Ground
    • If less than battery voltage 
    1. Test for less than 2 ohms between the test points: B+ circuit terminal 1 & Output terminal @ F62UA Fuse
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • Go to next step: If less than 2 ohms
    2. Remove the component: F62UA Fuse
    3. Test for infinite resistance between the test points: B+ circuit terminal 1 @ Control module harness & Ground
    • If less than infinite resistance - Repair the short to ground on the circuit.
    • If infinite resistance - Verify the fuse is OK and there is voltage at the fuse.
    • Go to next step: If battery voltage 
  4. Replace the component: K115 Reductant Control Module
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