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Home >> Chevrolet >> 2024 >> Tahoe Commercial, 4WD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 12 (Engine Controls And Fuel - 3.0L (Lm2) Diesel - Diagnostic Information And Procedures (5 Of 5)) >> Diagnostic Information and Procedures >> DTC P244A or P244B >> Circuit/System Testing

Circuit/System Testing

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  1. Verify the following conditions do not exist:
    • Exhaust System - Leaking/Loose/Visible Damage
    • Particulate Filter Differential Pressure Sensor - Hoses/Lines - Kinked/Leaking/Restricted
    • If a condition exists 

      Repair as necessary.

    • Go to next step: If no condition exists 
  2. Remove and inspect the flexible part of the exhaust differential pressure lines for internal restrictions.
    • If any restrictions are found 

      Repair as necessary.

    • Go to next step: If no restrictions are found 
  3. Connect the EN 23738 - A vacuum gauge to port two (rear of particulate filter) of the B154 Diesel Particulate Filter Exhaust Differential Pressure Sensor.
  4. Ignition ON, using the EN 23738 - A vacuum gauge, slowly apply -10 kPa (3 in Hg) vacuum to the sensor while observing the DPF Differential Pressure parameter.
  5. Verify the parameter increases smoothly without spikes or dropouts.
    • If the parameter does not increase smoothly 

      Replace the B154 Diesel Particulate Filter Exhaust Differential Pressure Sensor.

    • Go to next step: If the parameter increases smoothly 
  6. Replace the Diesel Particulate Filter.
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