P1D9A - Incorrect Gear Ratio Clutch 'C' Or 'D' Defective

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3   
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Possible causes

  • Faulty Transmission Internal Components

Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P1d9a 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.
OBDII Code P1d9a - Incorrect Gear Ratio Clutch 'C' Or 'D' Defective - AutoCodes.com

P1D9A Information for specific makes

  • P1D9A ACURA Electric Powertrain Coolant Pump Control Malfunction
  • P1D9A CHRYSLER Incorrect Gear Ratio Clutch 'C' Or 'D' Defective
  • P1D9A DODGE Incorrect Gear Ratio Clutch 'C' Or 'D' Defective
  • P1D9A FIAT Incorrect Gear Ratio Clutch 'C' Or 'D' Defective
  • P1D9A HONDA Electric Powertrain Coolant Pump Control Malfunction
  • P1D9A JEEP Incorrect Gear Ratio Clutch 'C' Or 'D' Defective

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