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Home >> Chevrolet >> 2022 >> Tahoe PPV, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 14 (Engine Controls And Fuel - 3.0L (Lm2) Diesel - Diagnostic Information And Procedures (5 Of 5)) >> Diagnostic Information and Procedures >> DTC P2BAA >> Circuit/System Testing

Circuit/System Testing

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  1. Perform the following procedure/test: Contaminants-in-Diesel Exhaust Fluid Diagnosis .
    • If a condition exists 

      Repair as necessary

    • Go to next step: If no condition exists 
  2. Perform the scan tool function: Reductant System Leak Test
  3. Verify the scan tool parameter: Reductant Pressure = Greater than 450 kPa (65.3 PSI)
    • If less than 450 kPa (65.3 PSI) 
    1. Perform the scan tool function: Reductant Pump - 50%
    2. Verify the scan tool parameter: Desired Reductant Pump Speed = Reductant Pump Speed
      • Go to next step: If equal

        Go to next step: Replace the component: A38 Reductant Pump and Sensor Assembly

    • Go to next step: If 450 kPa (65.3 PSI) or greater 
  4. Verify there are no leaks, kinks or restrictions in the reductant lines.
    • If a condition exists 

      Repair as necessary

    • Go to next step: If no condition exists 
  5. Perform the scan tool function: Reductant Fluid Injector Quantity Test 
  6. Verify the procedure/test passes.
    • If the procedure/test does not pass 

      Repair as necessary

    • Go to next step: If the procedure/test passes 
  7. Perform the scan tool function: Reductant System Tamper Service Bay Test 
    • If the procedure/test does not pass 

      A condition with the system still exists - Refer to step 1

    • Go to next step: If the procedure/test passes 
  8. All OK.
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