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Discussion Starter #1
I have found one issue with the "new" Jeep Wrangler. This is a 2007 Wrangler X with 87k miles. When I cycle through the display, the AVG ECO screen does not display any numbers and the DTE screen always shows 255 miles left regardless of how much fuel is in the tank. The rest of the displays like Elapsed Time and the regular and trip odometers function as expected. But it's like the trip computer doesn't know how much fuel there is though the fuel gauge appears accurate.

Any thoughts?
 

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Loose wire?
 

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Virginia Gentleman
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Just a guess, but maybe the module (CCN or whatever) has some stored error codes. Probably need a Starscan or DRBIII reader to access them. Sounds like some sort of communication issue or a flakey sending unit. Imperial Crown probably has a better idea of what to check.
 

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This does sound like a CCN issue. Specifically the CMTC (compass/mini-trip computer) module. DTE and MPG are calculated by distance travelled (odometer, which works), Fuel level (fuel gauge, which works) and an engine load algorithm provided by the PCM.
Try a cluster self test (trip odo button, then roll the key on and release the button. Watch for any B-codes (body) or U-codes (CAN bus communication) and write them down. Then try a battery disconnect, pause and reconnect in case a logic 'lock-up' has occurred.
No software updates that I can see for the TIPM, CCN and PCM that would fix this, but you may want to have these enhancements installed anyway.
It may need a trip to the dealer for scan tool diagnosis.
 

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Discussion Starter #5
No error codes from the diagnostics. I will try a battery disconnect and if that does not work I'll probably just live with it as it is. At least until I need to visit the dealer for some other reason as well. Thanks!
 

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Discussion Starter #6
So to bring this old topic back from the dead:
I have seen some scattered posts on line that the AVE ECO and DTE functions stopped after recall J30 which was a recall to reprogram the CCN to add a transmission temperature warning. Results are exactly like mine, blank average MPG and distance to empty is always 255.
The posters say the dealers ended up replacing the cluster for free to fix this. The J30 recall was performed on my Jeep in Feb. 2011 at an out of state dealer. I doubt my dealer would agree to replace the cluster without me paying for it.
 
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