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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 P0989 or P0990 >> Circuit/System Testing

Circuit/System Testing

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

    You must perform the Circuit/System Verification first.

  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 , and Control Valve Body Replacement .
  2. Inspect the Q8 control solenoid valve assembly, filter plate, channel plate, and spacer plate for debris and blocked orifices.