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Home >> Chevrolet >> 2015 >> Cruze LT, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 84 (Automatic Transmission - 6T40 (MH8 MHB) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0815, P0816, or P0826: Upshift/Downshift Switch >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2015 Chevrolet Trax and 2015 Buick Encore. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S3 Transmission Shift Lever. It may take up to 2 min for all vehicle systems to power down.
  2. Test for less than 10 Ω between the vehicle harness connector terminal 2 and ground.
    • If 10 Ω or greater 
    1. Ignition OFF, disconnect the vehicle harness at the ground connection.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If greater than 2 Ω, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the ground connection.
    • If less than 10 Ω 
  3. Ignition ON.
  4. Test for 11-13 V at the vehicle harness connector between signal circuit terminal 3 and ground.
    • If not between 11-13 V 
    1. Ignition OFF, disconnect the connector at the BCM.
    2. Test for infinite resistance between the signal circuit and ground.
      • If less than infinite resistance, repair the short to ground in the circuit.
      • If infinite resistance.
    3. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the BCM.
    • If between 11-13 V 
  5. Ignition OFF, connect the harness connector at the S3 Transmission Shift Lever.
  6. Ignition ON, S3 Transmission Shift Lever in the M or manual mode position.
  7. Test for voltage between the S3 Transmission Shift Lever connector signal circuit terminal 3 and ground, by back probing the connector, for the conditions listed below.
    • 2.0-4.6 V - Plus button pressed
    • 5.1-7.3 V - Minus button pressed
    • 8.0-10.6 V - Neither button pressed
    • If voltage values are not correct 

      Replace the S3 Transmission Shift Lever.

    • If voltage values are correct 
  8. Replace the K9 Body Control Module.
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