Conditions for Running the DTC

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

Before the ECM can report DTC P0420 failed, DTCs P0030, P0031, P0032, P0036, P0037, P0038, P0101, P0102, P0103, P0121, P0122, P0123, P0130, P0131, P0132, P0133, P0135, P0137, P0138, P0140, P0141, P0221, P0222, P0223, P0335, P0336, P0338, P167A, P2096, P2097, P2195, P2196, P2231, P2232, P2237, P2243, P2251, P2270, P2271, P2297, and P2626, must run and pass.
DTCs P0010, P0011, P0013, P0014, P0020, P0021, P0023, P0024, P0030, P0031, P0032, P0036, P0037, P0038, P0101, P0102, P0103, P0117, P0118, P0121, P0122, P0123, P0125, P0130, P0131, P0132, P0133, P0135, P0137, P0138, P0140, P0141, P0221, P0222, P0223, P0300, P0443, P0458, P0459, P0496, P2088, P2089, P2090, P2091, P2092, P2093, P2094, P2095, P2096, P2097, P2100, P2101, P2107, P2119, P2122, P2123, P2127, P2128, P2138, P2176, P2177, P2178, P2187, P2188, P2195, P2196, P2232, P2237, P2243, P2251, P2270, P2271, P2297, or P2626 are not set.
The engine speed is 1,000-3,520 RPM.
The engine load is 18-55 percent.
The air flow into the engine is between 10-42 g/s and not changing greater than 8 g/s.
The engine intake air temperature (IAT) at engine start-up is greater than -9°C (-16°F).
The engine is operating for greater than 320 seconds.
The engine is operating in Closed Loop.
The calculated TWC temperature is between 480°C (896°F) and 630°C (1,166°F) and steady.
The above conditions exist for approximately 17 minutes.
DTC P0420 runs once per ignition cycle when the above conditions exist for approximately 17 minutes. The ECM will restart the test up to 3 times per ignition cycle, if the conditions above are interrupted during the test.