Speedometer not working - Jeep Commander Forums: Jeep Commander Forum
Electronics / NAV Discussion This section contains discussion about the electronics system and NAV system in the Jeep Commander.

 
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post #1 of 2 (permalink) Old 06-30-2016, 08:41 AM Thread Starter
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Join Date: Jun 2016
Location: Elgin, OK
Own a Commander?: Yes
Model year: 2010
Trim Package: Limited
Power-Train: 5.7L V-8 Hemi
4WD
If 4WD - system: QD-II
Current Mileage: 140,000
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Speedometer not working

Hello all, I searched the forum and did not see anything related to my issue. I pulled all the 20 and 30 amp fuses and reset everything to reset my 4wd low module. Now, my speedometer don't work, my parking brake light is on, my abs light is also on. WTF? Please help. It starts fine. The "service 4wd system" light is still on. (fuse 25)
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post #2 of 2 (permalink) Old 06-30-2016, 01:46 PM
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Join Date: Oct 2010
Location: Lusby, MD
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Check for blown fuses. I have blown fuses that lit my ABS, ESP and Traction Control Lights when I turned on the ignition with many things on the steering wheel and dash disconnected. The fuse box under the dash is where the fuse to the steering column power is located. Those systems use input from a steering wheel position sensor, that is dead if the fuse blows for power to the steering column.


The Final Drive Control Module (FDCM) controls the shifting of the XFR case, is that what you're talking about when you say "4wd low module"?


The latest software release is suppose to solve the problem of the last software release that incorrectly fails the FDCM on a self-test and disables any shifting of the XRF case. Of course, you could have a real problem with the FDCM, shift motor or mechanisms in the XFR case that is lighting the "Service 4WD System" warning for legitimate reasons.


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