LEMON Manuals: Even more car manuals for everyone
Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 935 (Engine Controls And Fuel - 4.8L, 5.3L, 6.0L And 6.2L - DTC P0231 To DTC P1255) >> DTC P0420 or P0430 >> Repair Verification

Repair Verification

WARNING: This page is about a different car, the 2007 GMC Sierra, 2007 GMC Cab & Chassis Sierra, 2007 Chevrolet Silverado, and 2007 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Clear the DTCs.
  2. Allow the engine coolant temperature to reach 70°C (156°F).
    • Place the gear selector in Park, Neutral for manual.
    • Set the parking brake.
  3. Press and hold the service brake.
  4. Run the engine for 6 minutes at 2500 RPM.
  5. Allow engine speed to return to idle speed, then place gear selector into Drive, or apply clutch pedal for manual.
  6. After 2 minutes verify that DTC P0420 or P0430 have passed or failed this ignition cycle.
    • If not passed or failed this ignition cycle, the test aborted resulting in an inconclusive test result. The above test may need to be repeated up to 5 more times during this drive cycle. The first test should be run after the initial warm up period of 6 minutes. Between subsequent tests maintain 2,500 RPM for 2 minutes.
  7. If 6 tests have been attempted and the DTC has not run or passed during this key cycle, turn the key to OFF for 30 seconds, then run the procedure a second time.
scientia non olet · About LEMON Manuals