C140F on Jeep

Final drive control module fault that disables 4WD shifting (Jeep)

Severity: Monitor

Jeep's bulletin describes a Service 4WD lamp and a transfer case that will not shift, not a loss of normal driving.

This page covers only what differs on Jeep. For what C140F means, the ranked causes and the test order, see the C140F guide.

2006–2008 · Grand Cherokee
Supported by vehicle data
Bulletin 21-022-14 reflashes the FDCM; owners report C140F after recall N23.

21-022-14Status unverified
4WD lamp with C140F in FDCM
2008grand-cherokee · issued June 18, 2018 · NHTSA 10141220
Check FDCM software and reflash.
We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.
21-022-14 REV. AStatus unverified
4WD lamp with C140F in FDCM (rev A)
2006grand-cherokee · issued June 18, 2018 · NHTSA 10141242
Revised version of the FDCM reflash bulletin.
We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.

Jeep 21-022-14: 4WD Lamp Illuminated and Diagnostic Trouble Code C140F Active in Final Drive Control Modu — NHTSA manufacturer communications (flat file, NHTSA ID 10141220)
Jeep 21-022-14 REV. A: 4WD Lamp Illuminated and Diagnostic Trouble Code C140F Active in Final Drive Control Modul — NHTSA manufacturer communications (flat file, NHTSA ID 10141242)
NHTSA complaint ODI 10559323: 2006 Jeep Grand Cherokee, C140F after N23 recall — NHTSA Office of Defects Investigation

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