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HOMESERVICE MANUALSPONTIAC2006G6 GTP, 2D COUPE, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 16 (ENGINE CONTROL SYSTEM - 2.4L - DTC P0351 TO DTC P2138)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, P0068, P0106, P0107, P0108, P0112, P0113, P0117, P0118, P0120, P0121, P0122, P0123, P0130, P0131, P0132, P0133, P0134, P0135, P0136, P0137, P0138, P0140, P0141, P0171, P0172, P0201, P0202, P0203, P0204, P0220, P0300, P0315, P0326, P0327, P0336, P0340, P0341, P0442, P0446, P0452, P0453, P0455, P0496, P0502, P0506, P0507, P0601, P0602, P1133, P1516, P1621, P2135, P2138, P2176 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 70-126°C (158-259°F).
  • The barometric pressure (BARO) is more than 70 kPa.
  • The catalytic converter (TWC) calculated temperature is between 550-800°C (1,022-1,472°F).
  • The vehicle is in Closed Loop.
  • The intake air temperature (IAT) is between -20 and +250°C (-4 and +482°F).
  • The battery voltage is more than 10.7 volts.
  • The engine is idling with the operator's foot off the accelerator pedal.
  • The short term fuel trim (FT) is between -4 and +4 percent.
  • The engine load must be stable.
  • Idle the engine and keep 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 lean, above 15.3, for up to 7 seconds and then may transition rich, below 14.1, for up to 7 seconds.
  • Verify if DTC P0420 has passed or failed this ignition cycle with the scan tool.
  • This diagnostic attempts one test during each valid idle period when the above conditions have been met. This diagnostic attempts up to 6 tests during each drive cycle.
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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.