Diagnostic Aids

1995 GMC Suburban C1500, 6.5 FSECTION Diagnostic Aids

Check for a faulty bulb or fuse. An open in SERVICE THROTTLE SOON light control circuit will cause DTC 49 to set.

Fig 1: DTC 49 Schematic (6.5L Diesel) Service Throttle Soon Light Circuit Fault
G95H27406
RENDER: 1.0x

NO RELATED

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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.