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HOMESERVICE MANUALSPONTIAC2006G6 GTP, 2D COUPE, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 17 (ENGINE CONTROL SYSTEM - 3.5L - DTC P0401 TO DTC P1133)DTC P0420CONDITIONS FOR RUNNING THE DTC
2006 Pontiac G6 GTP, 2D Coupe, Standard

Conditions for Running the DTC

2006 Pontiac G6 GTP, 2D Coupe, StandardSECTION Conditions for Running the DTC
WARNING: This page is about a different variant/trim than selected.
  • DTCs P0030, P0036, P0053, P0054, P0068, P0101, P0102, P0103, P0107, P0108, P0112, P0113, P0116, P0117, P0118, P0120, P0125, P0128, P0131, P0132, P0133, P0134, P0135, P0137, P0138, P0140, P0141, P0171, P0172, P0201, P0202, P0203, P0204, P0205, P0206, P0220, P0300, P0325, P0327, P0332, P0335, P0336, P0340, P0341, P0401, P0403, P0404, P0405, P0406, P0442, P0443, P0446, P0449, P0455, P0496, P0506, P0507, P1133, P1134, P1258, P1404, P1516, P2101, P2107, P2108, P2119, P2120, P2125, P2135, P2138, P2A00, P2A01, U0107 are not set.
  • The engine has been running for more than 10 minutes.
  • Since new, the vehicle must have run for at least 1 hour, followed by a key cycle.
  • The engine coolant temperature (ECT) is between 75-124°C (167-255°F).
  • The barometric pressure (BARO) is more than 70 kPa.
  • The vehicle is in Closed Loop.
  • The intake air temperature (IAT) is between -20 and +100°C (-4 and +212°F).
  • The battery voltage is more than 10.7 volts.
  • The throttle position (TP) is 1.5 percent or less.
  • The short term fuel trim (FT) is between -3.5 and +2.5 percent.
  • The calculated mass air flow (MAF) is between 3-10 g/s.
  • Warm the catalyst by performing the following procedures:
    • Fully open the hood.
    • Place the transaxle in PARK for automatic transaxle.
    • Place the transaxle is NEUTRAL for manual transaxle, with clutch pedal depressed.
    • Set the parking brake.
    • Press and hold the service brake.
  • This diagnostic attempts 1 test during each valid idle period once the above conditions have been met for 5 seconds. This diagnostic attempts up to 6 tests during each drive cycle. The first test may be run after the initial warm up period of 10 minutes. Maintain engine speed between 2,000-3,000 RPM in park or neutral for 2 minutes. Allow the engine to return to a stabilized idle. Shift into drive for an automatic transmission, without touching the accelerator in order for the test to run. Between each subsequent test, maintain engine speed between 2,000-3,000 RPM in park or neutral for 2 minutes. Allow the engine to return to a stabilized idle. Shift into drive for an automatic transmission, without touching the accelerator in order for the test to run.
  • Test the catalyst by performing the following procedures:
    • Idle the engine and place the vehicle in Drive, or depress the clutch pedal for a manual transmission vehicle, to activate the diagnostic. Within 60 seconds, the air fuel ratio will transition rich, short term fuel trim may change to approximately 10 percent, for up to 5 seconds, and then may transition lean, short term fuel trim may change to approximately -10 percent, for up to 3 seconds.
    • Verify if DTC P0420 has passed or failed this ignition cycle with the scan tool.
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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.