Question about 2005 Mercury Mountaineer

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Engine Failsafe Mode came on after cleaning battery cables. Vehicle will start, but won't run. No throttle

I took the battery cables off to clean them. Now the dash is displaying Engine failsafe mode. It does not react to the throttle at all. There is also a wrench icon lit. I can't drive it .. how do I fix it?

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  • Lori Feb 26, 2012

    My brother added a quart of oil .. waited a few minutes and started it .. IT WORKED! Never heard of such a thing .. but he said it happened to him in his F150. Problem solved!

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  • Mercury Master
  • 2,431 Answers

Fail safe is TPS sensor. When you go in fail safe the vehicle give a set amount of RPM and no throttle response the rule of thumb in fail safe is APP1 and APP2 does not agree the goal is to protect the catalytic convertor. So if the transmission was at fault you dont over rev to end up burning the Cat. Or over rev to break the engine It all boils down to a throttle body assembly as the solution

Posted on Feb 26, 2012

Testimonial: "I took the vehicle to Ford, they replaced the throttle body. Runs great now! :) "

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Posted on Jan 02, 2017

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vetteman3002
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SOURCE: Removed battery posts on vehicle to clean and to

The fail safe mode is caused by low battery or disconnecting the battery. Now the check engine light is on because it got a code from the fail safe mode. You can try to reset it by removing the battery cable for 10 minutes again. This may cause the fail safe mode again and start the whole process over again. The fail safe mode should not come up again though. Make sure that the key is off when you remove and replace the battery cable.

Posted on Oct 26, 2010

  • 1 Answer

SOURCE: I gave a 2005 Mercury

I have the same car and HAD the same problems. Just got it back from the Tranny shop, seems to have fixed the issues. Take it to a very good transmission shop and tell them it is a known issue, some kind of bearings in the tranny, hence the knocking...

Posted on Jan 31, 2011

  • 5655 Answers

SOURCE: 05 Mercury Montego Throttle control/sensor

Try a salvage yard for the part. As soon as your new car left the lot it became a used car. Used cars run on used parts.
If the old part is a recall they will upgrade you regardless which part is on your car.
Check the internet and enter your part# in the search box of the Browser. You may get lucky for a new part.

Posted on Aug 18, 2009

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Jan 11, 2016 | Land Rover Range Rover Cars & Trucks

1 Answer

Engine Failsafe Mode is activated


It may be if you ignore the light. Check the oil level and coolant levels first if ok have the fault codes read to determine the sensor that put the light on. Repair it and go from there.. Normally the ECM goes into safe mode to protect the engine and gear box from serious damage but it depends on the driver to react promptly to stop further damage occurring.

Mar 18, 2014 | Cars & Trucks

1 Answer

Failsafe engine mode


You might try to have your battery tested. The Anti-theft system reacts to low battery voltage and automatically reduces the Voltage to the starter so it will not turn over or turn over fast enough to start; thereby defeating thieves.

Failsafe usually is an extreme heat sensor mode which deactivates some of the cylinders so the engine exhausts excess heat through the exhaust valve. This is why top speed is limited and power is reduced. The deactivated cylinders act like air compressors, they have no fuel charge, and thereby draw air into the cylinder and expel heated air.

Jan 28, 2014 | 2005 Ford Freestyle

1 Answer

What does failsafe engine mode mean?


Hi there, Failsafe engine mode means that there's something wrong with your car. This feature limits you to 30% throttle to allow you to get safely off the highway or to a shop. It is a safety feature so you're not stranded somewhere.
This is most commonly seen when the brake switch goes - it is possible to fix it with a lot of WD40 to get the contacts going again. The brake switch is under the dash connected to the brake arm.
If you take it into a shop, they may want to replace it. It will be at least $50 for the part.
Alex

May 31, 2011 | 2000 Jaguar S-Type

1 Answer

Today the engine failsafe mode message was on my dash display. What does this mean?


it says limp-home operations what does that mean and what is the real promblem that is occuring with my mustang. my warning display is stating engine failsafe mode when i was driving also felt no pick up for a couple of miles. please answer

Sep 17, 2010 | 2005 Ford Mustang

4 Answers

Solution for the message "engine fail safe mode" in explorer 2005


I have hearing a lot of this lately with Fords. Most of the time this dash board light comes on due to problems with the Throttle Body (TB)not just your coolant,etc.. If it is sticking,dirty,causing misfires,etc. then this can cause an engine fail safe mode.You might first try putting in some injector cleaner and a higher grade of gas.Many people I know who have had this problem have had to have their TB cleaned and/or replaced. This is something Ford dealerships now about,but hasn't been made a recall or anything.There are service bulletins though.Mainly keeping cleaner in your gas and performing ritual tune-ups/oil changes may be the only thing you can do.Hope this helps

Apr 17, 2010 | 2005 Ford Explorer

1 Answer

My husband cleaned the throttle body on our F-150 Triron and he un hooked the battery to reset the engine light ,when he did that the wrench light came on and said it was in limp-home mode operation what...


Oops. This means you will not be able to drive very fast. The failsafe will kill several of the cylinders and use them to help cool the engine. It is designed to help get you going when the engine loses coolant.

If the engine light was on before, it was diagnosing a problem. If the engine light came on after something was sprayed into the throttle body, it has reacted with some of the sensors or Oxygen monitors.

Best you can do is get to an Autozone or Oreillys for a free scan and let them clear the computer for you.

Mar 08, 2010 | 2006 Ford F 350 Super Duty

2 Answers

What does Failsafe Engine Mode mean? my manual was stolen


Hello! Fail safe mode is when the vehicle's computer detects a serious problem an allows you to "limp" off the road or highway safely.

Fail safe mode on a Jaguar is mainly caused by a dirty and gummed up throttle body. The throttle body on your auto has a protective coating, so you can not use just any cleaner. It requires a throttle body cleaner that states "safe to use with a protective coating". The butterfly valve in the throttle body will actually "stick out". This causes fail safe mode to kick in reducing the amount of power your engine can produce.

Also check the plugs on your ECM (computer) and make sure they are all seated properly.


Guru...............saailer

Dec 13, 2009 | 1998 Jaguar XJ8L

1 Answer

My 2000 Jag S type also keeps saying failsafe mode?


fail safe mode is something the vehicle computor will go into when there is a problem with the vehicle it allows u to get off the highway or road safely you need to take vehicle to repair shop or your dealer which ever u prefer Failsafe engine mode on a 2000 jaguar s type is caused by a stopped up throttle body. Jaguar says not to clean the throttle body since it has a protective coating to help keep deposits from accumulating. You can clean the throttle body as long as you use ONLY throttle body cleaner that states it is safe to use with a protective coating. The butterfly valve in the throttle body will actually stick not allowing air to flow into the manifold causing failsafe engine mode to kick in reducing the amount of power your engine will produce. To solve the issue just clean out your throttle body, it will cost you around $5 dollars and take 1 hour of your time.

Jun 07, 2009 | 2000 Jaguar S-Type

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