C140F on 2011-2021 Jeep Grand Cherokee (Limited, Overland, Summit, Trailhawk) — Transfer Case Range Position Sensor Erratic Performance
1 vehicles · 1 makes · $200-$2,500 repair
Most Reported On
C140F is an OBD-II diagnostic trouble code meaning “Transfer Case Range Position Sensor Erratic Performance.” A Chrysler/Dodge/Jeep (FCA) chassis code set by the Final Drive Control Module (FDCM), which monitors the transfer case range position sensor for erratic-performance failures. The transfer case shift actuator reports its position back as an analog/encoder signal; when that signal jumps around or falls outside a valid range, the module cannot determine what range the transfer case is in and sets C140F. Drivers typically see a "Service 4WD" message or 4WD light, and the transfer case may refuse to shift between 4WD High, 4WD Low, and Neutral. It is strongly associated with 2005-2010 Jeep Grand Cherokee and Commander and with Recall N23 — factory instructions call for clearing the code (up to three times) and applying the correct software update after N23 before replacing hardware. It may set together with C1405 (range position sensor circuit high) when the actuator has failed. This code is most commonly reported on 2011-2021 Jeep Grand Cherokee (Limited, Overland, Summit, Trailhawk), with repair costs ranging from $200 to $2,500.
Common Causes
Typical Repair Cost
Based on 1 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
C140F does not use the standard P/B/C/U prefix. It may be a manufacturer-specific code, so verify that a scanner supports your exact year, model and module before buying.
FAQ
What does C140F mean?
C140F stands for "Transfer Case Range Position Sensor Erratic Performance." A Chrysler/Dodge/Jeep (FCA) chassis code set by the Final Drive Control Module (FDCM), which monitors the transfer case range position sensor for erratic-performance failures. The transfer case shift actuator reports its position back as an analog/encoder signal; when that signal jumps around or falls outside a valid range, the module cannot determine what range the transfer case is in and sets C140F. Drivers typically see a "Service 4WD" message or 4WD light, and the transfer case may refuse to shift between 4WD High, 4WD Low, and Neutral. It is strongly associated with 2005-2010 Jeep Grand Cherokee and Commander and with Recall N23 — factory instructions call for clearing the code (up to three times) and applying the correct software update after N23 before replacing hardware. It may set together with C1405 (range position sensor circuit high) when the actuator has failed.
What are the most common causes of C140F?
The most common causes of C140F are: Corroded or water-intruded connector at the transfer case shift actuator/motor, Faulty transfer case range position sensor/encoder inside the actuator assembly, Damaged or chafed wiring between the actuator and the FDCM, Loose or corroded FDCM connector, Outdated FDCM software — code commonly sets after Recall N23 and requires the factory flash/clear procedure, Failed transfer case shift motor/actuator assembly. The specific cause varies by vehicle.
How much does it cost to fix C140F?
Repair costs for C140F range from $200 to $2,500, depending on the vehicle and root cause.
Which vehicles are affected by C140F?
Au7o has documented C140F across 1 vehicle models from 1 manufacturers: Jeep.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.