2011 Chevrolet VoltFACTORY OEM SERVICE PROCEDURE

Circuit/System Testing

    NOTE: Use the schematic to identify the following:
    • Control module location on the high speed GMLAN serial data circuits
    • The control module B+, ignition, ground, communication enable and serial data circuit terminals
  1. Ignition OFF, disconnect harness connector at the K71 transmission control module (TCM).
  2. Test for less than 10 Ξ© between each ground circuit terminal and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. If equipped, ignition ON, verify that a test lamp illuminates between each B+ circuit terminal and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit fuse is open, test the control circuits of the K71 TCM for a short to ground. If the circuits test normal, replace the K71 TCM.
  4. If equipped, ignition ON, verify that a test lamp illuminates between each ignition circuit terminal and ground.
    • If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit fuse is open, test the control circuits of the K71 TCM for a short to ground. If the circuits test normal, replace the K71 TCM.
  5. If equipped, ignition ON, verify that a test lamp illuminates between the wake-up circuit terminal and ground.
    • If the test lamp does not illuminate, test the entire circuit, including the B+ circuit to the K114B hybrid powertrain control module 2, for an open/high resistance or short to ground. If the circuits test normal, replace the K114B hybrid powertrain control module 2.
  6. Ignition OFF, disconnect the harness connector at the K17 electronic brake control module (EBCM).
  7. Ignition OFF and all vehicle systems OFF, all keys at least 3 meters away from vehicle, all access doors closed. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 1 Ξ© in each high speed GMLAN serial data circuit between the K71 TCM and the K17 EBCM.
    • If greater than the specified range, test the serial data circuit for an open/high resistance between the K71 TCM and the K17 EBCM.
  8. If all circuits test normal, replace the K71 TCM.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.

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