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Most likely the transfer case needs to be replaced, but this also could be an electrical problem. This code will need to be diagnosed.
C1438-TRANSFER CASE DIFFERENTIAL CLUTCH WORN
Fig 1: Mode Select Circuit & Drivetrain 5 Volt Supply Circuit Schematic
Courtesy of CHRYSLER LLCView Full-Screen
For complete wiring diagrams, refer to SYSTEM WIRING DIAGRAMS .
The ignition on, engine running. No Under/Overvoltage, and/or encoder error DTCs present. When shifted into 4-Low or in 4-high.
The Final Drive Control Module (FDCM) is unable to fully lock the T-Case (in Either High or Low) because the T-Case clutch is worn.
(K504) DRIVETRAIN 5 VOLT SUPPLY CIRCUIT OPEN OR HIGH RESISTANCE
(T313) MODE SENSOR SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE
(K594) DRIVETRAIN SENSOR RETURN CIRCUIT OPEN OR HIGH RESISTANCE
TRANSFER CASE CLUTCH
FINAL DRIVE CONTROL MODULE (FDCM)
NOTE: Diagnose and repair any system voltage or Transfer Case related DTCs in the FDCM before continuing with this test.
Does this DTC reset?
Fig 2: Checking Transfer Case Motor
Does the voltage display as described?
Fig 3: Checking Transfer Case Position Sensor Voltage
Is the voltage between 4.8 volts and 5.2 volts?
Fig 4: Checking Drivetrain 5 Volt Supply Circuit High Resistance
Is the resistance above 5.0 ohms?
Fig 5: Checking Mode Sensor Signal Circuit High Resistance
Fig 6: Checking Drivetrain Sensor Return Circuit High Resistance
Is the resistance below 5.0 ohms?
Were any problems found?
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