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Old 10-07-2014, 04:29 PM
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Protection Mode?

Just read a customer review on another site who discussed his diesel going into "protection mode" during starts in cold weather. Any words of wisdom on this would be greatly appreciated. Thanks.

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Old 10-07-2014, 04:46 PM
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Re: Protection Mode?

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Originally Posted by SCMomentum View Post
Just read a customer review on another site who discussed his diesel going into "protection mode" during starts in cold weather. Any words of wisdom on this would be greatly appreciated. Thanks.
Modern cars have several modes. There's the Limp mode that a lot of cars these days have to protect the engine against abuse. People associate the "Limp Mode" with some semi-catastrophic engine or transmission failure which allows you to crawl the car home or to a mechanic at reduced speeds or with limited functionality.

The Protected Mode is another flavor of the car's self preservation mode. I do not know it specifically for the diesel, but on many cars, you will not be allowed to rev to red line until the engine is fully warmed, the automatic transmission might hold lower gears longer, in winter the heater - when placed in automatic mode will not blow any air for several minutes - until the engine is hot enough: e.g. my Subaru Legacy STI doesn't blow warm air inside the cabin, in winter, until the engine coolant temperature reaches 60 degrees Celsius (140 F) and that is already warm enough.
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Old 10-07-2014, 08:57 PM
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Re: Protection Mode?

The article stated that the car would not start in cold (-10) weather...was supposedly in "protection mode".


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Old 10-07-2014, 10:12 PM
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Re: Protection Mode?

Quote:
Originally Posted by SCMomentum View Post
The article stated that the car would not start in cold (-10) weather...was supposedly in "protection mode".
This is the first time, reading all diesel related post here over the last year, that I have heard of "protection mode"....only "no start" and "limp mode". If "protection mode" is the proper name for "limp mode", that would make sense.

Early builds had an issue with the DEF injection malfunctioning in extreme cold. This was resolved with a software update. We have since seen owners crank just fine in sub-zero weather.

The main year one issues have been emissions system and transmission shift quality related and Jeep is actively working on the powertrain programming to address these.
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Old 10-07-2014, 10:30 PM
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Re: Protection Mode?

Thanks...I greatly appreciate it.


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Old 10-08-2014, 07:29 AM
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Re: Protection Mode?

I think owners should be in protection mode with any mechanical vehicle - let it warm up properly before subjecting it to harsh use. The oil needs time to warm as well as the surfaces it protects - you want an even temperature (metals expand / contract).

In the winter I park inside the garage and when it gets well below freezing I plug it in at night (all night) so it does not have a harsh cold start regularly.
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