2019 GMC Terrain SLFACTORY OEM SERVICE PROCEDURE

Diagnostic Aids

  • Resolve any current DTC's that are present relating to the Electronic Transmission Range Select system prior to programming module. Refer to Electronic Transmission Range Selector Description . Faults in any component or module that work together in this system may cause the programming/setup failure.
  • Replacement of Transmission Range Control Module requires proper installation of module and in some cases a linkage between the module and the transmission. If installation is not performed properly, programming or setup procedure may fail.
  • If programming/setup failure occurs, refer to the wiring diagnostics to resolve any electrical faults, check Transmission Range Control Module and linkage installation if applicable and attempt reprogramming 2 additional times before replacing Transmission Range Control Module.
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:

  • • 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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