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Old 11-24-2014, 02:49 PM
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Oil Change Sensor Gone Bad?

Hoping you guys can provide a little insight here since this is my first diesel, but I took the vehicle in over the weekend because my oil change light was reading at 3% so I figured it was time to get it done. My vehicle only has 2,900 miles on it so is it really necessary or could it have gone without being reset at some point?

The service manager said it shouldn't be changed yet and that he would do it closer to 7500 miles. He said that I must have a "bad sensor" or "something in the computer isn't working correctly" and that he wants to open a "Star Case"

Is all that necessary, or can I just reset the light and plan on changing it here in the near future? I just don't want to do any damage.

Thanks for you help.

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Old 11-24-2014, 03:13 PM
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Re: Oil Change Sensor Gone Bad?

There was a technical service bulletin posted by Chrysler about the inaccurate oil life gauge that was posted months ago. I can't find the exact TSB number right this second by you may want to do some research here Jeep Grand Cherokee WK2 - 2011-2016 Grand Cherokee Service Bulletins and Recalls and pull the correct TSB and take it to your dealer for them to update.

Edit: found the correct one, like netboy posted below.
http://www.wk2jeeps.com/tsb/tsb_wk2_1801814d.pdf
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Old 11-24-2014, 03:18 PM
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Re: Oil Change Sensor Gone Bad?

Quote:
Originally Posted by 1blkt View Post
Hoping you guys can provide a little insight here since this is my first diesel, but I took the vehicle in over the weekend because my oil change light was reading at 3% so I figured it was time to get it done. My vehicle only has 2,900 miles on it so is it really necessary or could it have gone without being reset at some point?

The service manager said it shouldn't be changed yet and that he would do it closer to 7500 miles. He said that I must have a "bad sensor" or "something in the computer isn't working correctly" and that he wants to open a "Star Case"

Is all that necessary, or can I just reset the light and plan on changing it here in the near future? I just don't want to do any damage.

Thanks for you help.
Make sure they applied RRT 14-028. This is a 4th revision of a PCM firmware flash (18-018-14 REV. D) and one of the issues one of the previous revisions corrected is an incorrect oil life monitor indicator that goes too fast.
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Old 12-04-2014, 09:19 AM
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Re: Oil Change Sensor Gone Bad?

I don't think there is a senor. A real sensor of that type would cost as much as the vehicle according to John Martin in a TDR magazine article a while back. He is a retired oil industry engineer and at one time task with that very issue - building such a sensor. They do exist but usually only measure one of many parameters such a electrical impedance. I believe the jeep uses a duty cycle algorithm to base oil change interval. In other words, the harder you drive it the shorter the interval. I'd ignore it and use mileage. If you worried do used oil anaylsis. Everyone in the auto industry will tell you to change your oil sooner than necessary. Think about it, it makes them money and leaves no chance of excessive wear. Doing oil analysis gives you accurate objective data for your vehicle and situation.
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