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Home >> Jeep >> 2018 >> Wrangler Unlimited Moab >> Repair and Diagnosis >> Transmission >> Transmission Control Systems >> Transmission Control Module (TCM) - DTCS P1D91-00 To U1477-00 >> DTC Troubleshooting >> P1DAC-00-Engine Speed Undetermined >> Possible Causes

Possible Causes

Possible Causes
POWERTRAIN CONTROL MODULE (PCM) DTCS ARE SET
BUSSED SPEED SIGNAL
TRANSMISSION SPEED SENSOR TERMINAL CONTAMINATION
INTERNAL TRANSMISSION FAILURE
TRANSMISSION CONTROL MODULE (TCM)

Always perform the PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE before proceeding. Refer to  PRE-DIAGNOSTIC TROUBLESHOOTING PROCEDURE  .

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