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HOMESERVICE MANUALSGMC1998CAB & CHASSIS C2500, 5.7 KREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 249 (CRUISE CONTROL SYSTEM)PROGRAMMINGPOWERTRAIN CONTROL MODULEPROGRAMMING VERIFICATION
1998 GMC Cab & Chassis C2500, 5.7 K

Programming Verification

1998 GMC Cab & Chassis C2500, 5.7 KSECTION Programming Verification
WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
  1. With a scan tool, clear the DTCs.
  2. Attempt to start the engine.
  3. Repeat the SERVICE PROGRAMMING procedure if the engine does not start or operates poorly. Perform the following procedures before programming the PCM:
    • Ensure that the control module and the DLC connections are OK.
    • Ensure that the Techline operating software is up-to-date.
    • Ensure that the calibration part number is correct for the vehicle.
  4. Attempt to program the control module. If the control module still cannot be programmed properly, replace the control module. You must program the replacement control module.
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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.