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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 94 (Engine Controls And Fuel - 2.8L (LWN) Diesel - Diagnostic Information And Procedures (3 Of 3)) >> Diagnostic Information and Procedures >> DTC P2627 or P2628 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON
  2. Verify DTC P00C7, P00E9, P00EA, P00EB, P00EC, P0101, P0102, P0103, P0106, P0107, P0108, P0116, P0117, P0118, P0119, P0128, P0201-P0204, P020A-P020D, P0216, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P02EE, P02EF, P02F0, P02F1, P0405, P0406, P049D, P0545, P0546, P111E, P113B, P113C, P113D, P113F, P115E, P115F, P1160, P116A, P116B, P116C, P116D, P116E, P116F, P118E, P118F, P1192, P1193, P1194, P1196, P1198, P119A, P119B, P119C, P11C5, P11C6, P11DB, P11DD, P1248, P1249, P124A, P124B, P126A, P2032, P2033, P2081, P2085, P2200, P2205, P2206, P2207, P2208, P2209, P2210, P220A, P2211, P2147, P2148, P2150, P2151, P2227, P2228, P2229, P2230, P242C, P242D, P242E, P2452-P2456, P2481, P2482, or P2484 is not set.
    • Go to next step: If none of the DTCs are set 
  3. Verify that DTCs P2627 or P2628 are not set
    • If any of the DTCs are set 

      Replace the B195A Nitrogen Oxides Sensor 1

    • Go to next step: If none of the DTCs are set 
  4. 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.
  5. Verify the DTC does not set.
    • If the DTC sets 

      Replace the B195A Nitrogen Oxides Sensor 1

    • Go to next step: If no DTC sets 
  6. All OK.
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