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Home >> Chevrolet >> 2023 >> Tahoe SSV >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Engine Controls And Fuel - 3.0L (Lm2) Diesel - Diagnostic Information And Procedures (5 Of 5)) >> Diagnostic Information and Procedures >> Reductant System Malfunction Service Bay Test >> Reductant System Warning Malfunction Service Bay Test

Reductant System Warning Malfunction Service Bay Test

WARNING: This page is about a different variant/trim than selected.
WARNING:

Tailpipe outlet exhaust temperature will be greater than 300°C (572°F) during this procedure. To help prevent personal injury or property damage from fire or burns, perform the following:

  1. Do not connect any shop exhaust removal hoses to the vehicle tailpipe.
  2. Park the vehicle outdoors and keep people, other vehicles, and combustible material away during this procedure.
  3. Do not leave the vehicle unattended.
WARNING:

To avoid extremely elevated exhaust temperatures, inspect and remove any debris or mud build up at the exhaust cooler located at the tailpipe.

NOTE:
  • If the reductant level warning status is at level 4 or higher, fill the DEF tank and perform the Reductant Fluid Tank Level Reset procedure.
  • The scan tool must remain connected to the DLC during the entire Reductant System Warning Malfunction Service Bay Testt.
  • Do not perform the Reductant System Warning Malfunction Service Bay Test if the diesel exhaust fluid (DEF) temperature is colder than -7°C (19°F).
  1. Verify DEF tank is full and not in reductant warning level restriction.
    • If the reductant system is in restriction 

      Fill the DEF tank and perform the scan tool Reductant Fluid Tank Level Reset procedure.

    • Go to next step: If the reductant system is not in restriction 
  2. Perform the Ambient Air Temperature Reset with a scan tool if the vehicle has been driven in an outside temperature colder than -5°C (+23°F).
  3. Engine idling and at operating temperature, observe the DTC information with a scan tool. Verify there are no DTCs set.
    • Go to next step: If a DTC is not set 
  4. Perform a Particulate Filter Service Regeneration. Refer To: Particulate Filter Service Regeneration
  5. Verify the scan tool parameter: Exhaust Gas Temperature Sensor 2 = Warmer than 218°C (425°F)
    • If 218°C (425°F) or colder

      Wait until the conditions are met

    • Go to next step: If 218°C (425°F) or warmer
    6. NOTE:

    Do not apply accelerator pedal after starting engine, otherwise the test will fail and will need to return to step 1 of the test.

  6. Start engine.
  7. Engine idling, connect scan tool and select the scan tool Reductant System Warning Malfunction Service Bay Test in the Output Controls menu and follow the instructions.
    8. NOTE:

    If the Reductant System Warning Malfunction Service Bay Test exceeds 20 minutes and does not complete, a second Reductant System Warning Malfunction Service Bay Test will be necessary

  8. Command the Reductant System Warning Malfunction Service Bay Test On with a scan tool. The Reductant System Warning Malfunction Service Bay Test should start and run at idle speed for up to 20 minutes.
  9. The Reductant System Warning Malfunction Service Bay Test will complete automatically.
    • If the test exceeds 20 minutes 
    1. Engine Idling.
    2. Command a second Reductant System Warning Malfunction Service Bay Test On with a scan tool.
    • If the second test does not complete, a condition with the system still exists
    • Go to next step: If the test completes 
  10. All OK.
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