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Home >> Chevrolet >> 2018 >> Equinox L >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 13 (Engine Controls And Fuel - 1.6L (LH7) Diesel - Diagnostic Information And Procedures (P0016 - P049D)) >> Diagnostic Information And Procedures >> DTC P0421: Catalyst 1 Low Efficiency >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.
  1. Verify that DTCs P0100, P010B, P010C, P010D, P014C, P014D, P0201, P0202, P0203, P0204, P0205, P0206, P0207, P0208, P020A, P020B, P020C, P020D, P020E, P020F, P021A, P021B, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276, P0277, P0279, P0280, P0282, P0283, P02EE, P02EF, P02F0, P02F1, P02F2, P02F3, P02F4, P02F5, P113D, P113F, P115E, P115F, P1160, P116A, P116B, P116C, P116D, P116E, P116F, P118E, P118F, P1192, P1193, P1194, P1196, P1198, P119A, P119B, P119C, P11C5, P11C6, P11DB, P1248, P1249, P124A, P124B, P124C, P124D, P124E, P124F, P12AF, P12B0, P12B1, P12B2, P2004, P2205, P2006, P2008, P2009, P200A, P2010, P2015, P2016, P2017, P201B, P201D, P20F8, P2147, P2148, P2150, P2151, P2153, P2154, P2156, P2157, P2205, P2206, P2207, P2208, P220A, P2210, P2211, P2227, P2228, P2229, P2230, P2297, P242B, P242C, P242D, P242E, P2452, P2453, P2454, P2455, P2456, P2481, P2482, P2483, P2484, P2627, P2628, P2A00, U029D are not set.
    • Go to next step: If none of the DTCs are set 
  2. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
  3. Verify the DTC does not set.
    • If the DTC sets 

      Refer to Circuit/System Testing.

    • Go to next step: If no DTCs set 
  4. All OK.
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