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
How to diagnose and fix C140F: most-reported vehicles
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Jeep Grand Cherokee · 2011–2021
Grand Cherokees with the two-speed Quadra-Trac II / Quadra-Drive II transfer cases throw a 'Service 4WD System' message when the transfer-case shift actuator motor (or the transfer-case control module) fails, leaving the vehicle unable to engage Low range or Neutral and sometimes producing a grinding noise. Owners and shops report it is difficult to diagnose: replacing the actuator motor does not always fix it, and some vehicles ultimately need a transfer case. Codes such as C140F are associated with the actuator failure. It is a high-demand complaint because the warning is alarming and the off-road/low-range function is lost.
Common Symptoms
- 'Service 4WD System' warning message
- Cannot engage 4-Low or Neutral
- Grinding or clicking noise from the transfer case
- 4WD inoperative
- C140F / transfer-case actuator fault codes
How to Fix
Scan for transfer-case actuator/control codes (e.g., C140F) before parts replacement. The shift motor is accessible after removing the belly skid guards (four bolts and a connector) and is the first replacement; if the fault persists, test the transfer case control module and wiring, and inspect the actuator's internal encoder ring/case for damage before condemning the whole transfer case. Verify any applicable recall coverage tied to the fault code.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Genuine Mopar transfer-case gear motor 68071235ACOEMMopar 68071235AC
Actuator replacement only after scan data and commanded testing confirm a motor or encoder failure Fitment/availability: Cataloged for 2011-2022 Grand Cherokee applications. Confirm VIN, transfer-case sales code and connector before purc…
- Genuine Mopar transfer-case control module 4854747ADOEMMopar 4854747AD
Control-module replacement only after circuit and network diagnosis condemns the module Fitment/availability: The live catalog limits this part number to specified 2012-2013 applications and requires VIN confirmation. Do not apply it to …
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Sources for this issue (2)
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C140F code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
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.