Mike's Workshop Manuals
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Jeep
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2018
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Wrangler Unlimited Moab
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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) - DTCS P1D91-00 To U1477-00
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DTC Troubleshooting
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P1DAC-00-Engine Speed Undetermined
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When Monitored
When Monitored
This diagnostic runs continuously when the following conditions are met:
Ignition on.
No sensor power supply failures detected.