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U1400 Diagnostic Trouble Code Discussion for May 2019

Implausible Throttle Position Sensor Signal Received


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Trouble Ticket Help Requests for DTC U1400
Help Request Posted
2009 Buick Enclave CXL 3.6L No Start, MIL Lamp on VIN: 5GAEV23D99
U1400: no comm BCM. I have been fighting this since Xmas. The event goes like this: While vehicle is running(driving or idling), the CEL will come on, "service stability control" message comes on, tachometer goes haywire, power locks cycle on their own. May or may not...
May 22, 2019