2007 Hummer H3 AutomaticFACTORY OEM SERVICE PROCEDURE

Ordered DTC Index

Diagnostic Trouble Code (DTC) List

DTC DTC Descriptor Module That Sets the DTC Diagnostic Procedure
IMPORTANT: Do not clear any DTCs unless instructed to do so by a diagnostic procedure
Factory Service Tools

Use the Manual With the Right Hardware

Pair factory procedures with proven DIY tools so the instructions are easier to execute.

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When to See a Mechanic

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

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

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