P1D9A CHRYSLER - Incorrect Gear Ratio Clutch 'C' Or 'D' Defective
Possible causes
Possible symptoms
P1d9a Chrysler Description
The Transmission Control Module (TCM) monitors for conditions which lead to an unexpected transmission gear ratio (e.g. slipping clutches, hydraulic or mechanical defects, etc.). The TCM compares the actual gear ratio (i.e. the ratio of input speed to output speed) to a minimum and maximum calibrated gear ratio value. The TCM performs this comparison while driving in a fixed gear, during gear engagement, and during shifting from one gear to another.
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