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Home >> Chevrolet >> 2013 >> Sonic RS, Standard Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 8 (Automatic Transmission - 6T30/6T40 - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0877 or P0878 >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition OFF, remove the Q8 control solenoid valve assembly, filter plate, channel plate and spacer plate. Refer to Control Solenoid Valve and Transmission Control Module Assembly Replacement .
  2. Inspect the Q8 control solenoid valve assembly, filter plate, channel plate, and spacer plate for debris and blocked orifices.
    • If debris or blocked orifices are observed 

      Clean or replace as necessary.

    • If no debris or blocked orifices are observed 

      Replace the Q8 control solenoid valve assembly.

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