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Wrangler Rubicon, Automatic Trans
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Repair and Diagnosis
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Transmission
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Transmission Control Systems
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(Transmission Control Module (TCM) - Electrical Diagnostics)
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DTC Troubleshooting
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U1401-Implausible Engine Speed Signal Received
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Set Condition
July 1:
So it begins
. Don't worry, this is not in the correct legal jurisdiction!
Set Condition
When the TCM detects an incorrect CAN ID from the ECM/PCM.