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Home >> Chevrolet >> 2018 >> Suburban 3500 HD LT >> Repair and Diagnosis >> External Pages >> Different car >> Section 9 (Engine Controls And Fuel - 5.3L (L83) Or 6.2L (L86) - DTC P0443 To DTC P3452 And Diagnostic Information And Procedures) >> Diagnostic Information And Procedures >> DTC P2635: Fuel Pump Flow Performance >> Circuit/System Testing

Circuit/System Testing

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2018 GMC Yukon XL, 2018 GMC Yukon, 2018 Chevrolet Tahoe, 2018 Chevrolet Suburban, and 2018 Cadillac Escalade ESV. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Do not replace the Fuel Pump Driver Control Module based on a history DTC P2635. DTC P2635 may be stored but that does not indicate a failure of the Fuel Pump Driver Control Module. Refer to Strategy Based Diagnosis for further history DTC diagnostics.
  1. Verify the proper fuel system pressure. Refer to Fuel System Diagnosis .
    • If the fuel pressure is not normal 

      Repair the fuel system as necessary.

    • Go to next step: If the fuel pressure is normal 
  2. All OK.
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