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Home >> Chevrolet >> 1998 >> Corvette 2D Convertible, Automatic >> Repair and Diagnosis >> Body & Frame >> Body, Cab Control Systems >> Body Control Module >> Diagnostic Tests >> DTC U1255: Serial Data Line Malfunction >> Diagnostic Aids
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Diagnostic Aids

  1. The following conditions may cause an intermittent: Intermittent open or short in serial data line; intermittent loss of communication with PCM or IPC; or damaged or loose star connector terminals.
  2. If serial data line is shorted to ground or voltage, all systems connected to same serial data line will not be capable of communicating properly. Systems capable of storing loss of communication DTCs will store these codes in their memory. After DTC U1255 is repaired, clear all DTCs from each system capable of storing this DTC.
  3. If DTC U1255 is set in BCM memory, check for the same DTC stored in other systems. If DTC U1255 is stored in other systems, check for short in serial data line circuit. If DTC U1255 is not stored in other systems, check for open in serial data line between BCM and PCM or IPC. If BCM is able to communicate with PCM or IPC when ignition is first turned on, BCM will set DTC U1255.
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