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U1301 Diagnostic Trouble Code Discussion for December 2007

Class 2 Data Line Short To Voltage

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Trouble Ticket Help Requests for DTC U1301
Help Request Posted
2001 Saturn SC1 1.9L idles at 1800 rpms VIN: 1G8ZN12811
U1301: Class 2 Data Link Circuit High Input. The high idle speed of engine is intermitant and happens when coming to stop and shifting into neutral or just holding clutch pedal depressed. Shutting off ignition and restarting engine and idle speed normal again. Problem could happen again when driven or no...
December 03, 2007
2005 Chevrolet Uplander LS 3.5L No Start VIN: 1GNDV23L45
U1301: class 2 serial data shorted to ground or power. ... hope there is a few of you out there). Customer concern is an intermittent no start and vehicle stalls, usually while turning corners. When stalling occurs, insturment cluster drops out. Vehicle restarts fine and all is well until next episode. I drove veh...
December 07, 2007