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Home >> GMC >> 2003 >> Jimmy 2D Utility, Part Time, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 112 (Data Link Communication System) >> Diagnostic Information and Procedures >> DTC U1000 and U1255: Operating Parameter Has Not Been Associated >> Test Description

Test Description

WARNING: This page is about a different car, the 2003 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

  1. A Lost Communication with XXX DTC with a history status may indicate the cause of U1000 or U1255.
  2. The modules which is not communicating is the likely cause of U1000 or U1255 being set.
  3. The module which was not communicating may have set Lost Communication with XXX DTCs for those modules that it was monitoring.
  4. The module which was not communicating may have set Lost Communication with XXX DTCs for those modules that it was monitoring.
  5. The module which was not communicating may have set Lost Communication with XXX DTCs for those modules that it was monitoring.
  6. The modules which can communicate indicate the module which cannot communicate. You must clear the DTC from these modules to avoid future misdiagnosis.
  7. If all modules are communicating, the module which set U1000 or U1255 may have done so due to some other condition.
  8. The module which set U1000 or U1255 is the likely cause of the malfunction.
Fig 1: DTC U1000 & U1255 (1 Of 2)
G01453103Courtesy of GENERAL MOTORS CORP.
Fig 2: DTC U1000 & U1255 (2 Of 2)
G01453104Courtesy of GENERAL MOTORS CORP.
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