Stop Safely Now failures
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Senior User
Joined: Jun 2006
Posts: 176
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From: Schaefferstown, PA
Stop Safely Now failures
So we've all heard about the famous Stop Safely Now failure and the problems they cause. So far, all the failures I have been able to find were caused by failures of one or more sensors.
The question is, what percentage of failures are caused by faulty sensors as apposed to actual failures of something else that caused exhaust system temperatures to be out of range, presumably the reason for the shutdown in the first place?
I don't question the need for the system to take some sort of action (a complete shutdown does seen to be a bit extreme) in the event of super high exhaust temperatures, I just wonder how often that actually happens.
The question is, what percentage of failures are caused by faulty sensors as apposed to actual failures of something else that caused exhaust system temperatures to be out of range, presumably the reason for the shutdown in the first place?
I don't question the need for the system to take some sort of action (a complete shutdown does seen to be a bit extreme) in the event of super high exhaust temperatures, I just wonder how often that actually happens.
Hotshot
Joined: Nov 2013
Posts: 10,107
Likes: 96
From: Hempstead, TX
This morning, I saw a report on NBC News that due to the many complaints of being stranded by this issue, Ford is going to do a reflash that allows a 40 MPH limp home, rather than a shutdown. They didn't say if it would be a recall, or a TSB, nor did they indicate when they would implement it, but it sounds like your voices have been heard.
Posting Guru
Joined: Jul 2004
Posts: 1,235
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From: Kamloops, BC
Or better yet... Having a shut down out the the bush with no way out except for your boots.. Absolutely should be a limp mode..... NOT a complete shut down.
Tuned
Joined: Aug 2010
Posts: 387
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From: Limestone County
On aircraft ECU's there are fault circuits that will through out a sensor if it completely disagrees with the others, ie. an open circuit or one that show a extremely high reading.
You would think Fords software engineers would do the same so as this don't shut down the Truck and cause a accident, or heaven forbid a death.IMHO
worked aircraft ECU electrical systems 30+ years.
You would think Fords software engineers would do the same so as this don't shut down the Truck and cause a accident, or heaven forbid a death.IMHO
worked aircraft ECU electrical systems 30+ years.
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Hotshot
Joined: Nov 2013
Posts: 10,107
Likes: 96
From: Hempstead, TX
The news report said Ford Diesels. It didn't specify any particular prep or package. Since the report came out, I've searched for a print/electronic version of the article to get the details better, but have had no luck. I can't possibly be the only person who saw the report though - unless of course I was having a very pleasant dream. It was on NBC News "Early Today" when I got home from work (night shift). The report was only about 30 seconds long.
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Laughing Gas
Joined: Sep 2008
Posts: 1,053
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From: Central NJ
If you think about it, it is shutting down for high temps. So, why not allow several minutes of limp mode to get off the road with all the bells and whistles going. Then a 20 minute cool down and it should allow you to continue.
Makes sense to me
Posting Guru
Joined: Jul 2004
Posts: 1,235
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From: Kamloops, BC
I don't think it actually does get hot.. Hence the problem. The sensor is malfunctioning and telling the ECU or ECM that there is a heat issue.... when there is actually not a real problem other than the sensor failing. Hope that make sense ?
Lead Driver
Joined: Jan 2010
Posts: 6,600
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Based on shutdown issue, there isn't programming that checks a possible problem against other sensors.
In a real heat issue, at least two sensors should be reporting the issue and then a shutdown should occur.
The problem here is one sensor reports a problem and the truck shuts down.
If EGT4 (post dpf) is reporting an issue (which is typically the case), it shouldn't shut the truck down when EGT 1-3 are fine.
In a real heat issue, at least two sensors should be reporting the issue and then a shutdown should occur.
The problem here is one sensor reports a problem and the truck shuts down.
If EGT4 (post dpf) is reporting an issue (which is typically the case), it shouldn't shut the truck down when EGT 1-3 are fine.
Lead Driver
Joined: Dec 2013
Posts: 9,762
Likes: 115
Apparently this is not limited to our diesel trucks.
EV Focus had a problem as well.
Ford finally responds to ‘Stop Safely Now’ problem with official recall | My Electric Car Forums
EV Focus had a problem as well.
Ford finally responds to ‘Stop Safely Now’ problem with official recall | My Electric Car Forums
Senior User
Joined: Jun 2007
Posts: 257
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From: Sterling, Colorado
Just had a failed sensor leave me stranded 4 hours from home, in the mountains, in a snow storm... 90 minutes from the nearest Ford dealer. 
Luckily this was in a place where I had a cell signal. Most of the time I spend in the mountains (which is a lot) is spent in areas that are a 60-90 minute drive from the nearest cell signal.
I've owned quite a few Ford trucks since 1990 and this is the first time I've ever needed a tow - so in that respect, I guess I'm lucky. But now I know that every camping trip is going to be accompanied by the worry of being left stranded again with this truck.
Luckily this was in a place where I had a cell signal. Most of the time I spend in the mountains (which is a lot) is spent in areas that are a 60-90 minute drive from the nearest cell signal.
I've owned quite a few Ford trucks since 1990 and this is the first time I've ever needed a tow - so in that respect, I guess I'm lucky. But now I know that every camping trip is going to be accompanied by the worry of being left stranded again with this truck.