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Limp mode car went into limp mode garage put new gear box in drove for 2 days started shuddering garage put old gear box back in still in limp mode

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  • Cars & Trucks Master
  • 2,122 Answers

Hi Mary, You have not told us the vehicle make or model, or basically anything we can use to determine what fault it may have. Take your vehicle to a reputable garage and ask them to carry out a diagnostic scan. Regards John

Posted on Dec 01, 2012

6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

Fame_Guru
  • 483 Answers

SOURCE: BAS/Esp light on with diagnostic symbol

Hi,
As you may know, modern automobiles (from the 1980's to present) have at least one computer controlling them. This computer (or computers) control the fuel to air mixture via either electronic fuel injection or a feedback carburetor. On the newer vehicles the computer also controls the ignition timing (That's when the spark plugs fire).
The newer a vehicle is,the more stuff the computer(s) control. The newest vehicles have the computer shifting the automatic transmission or transaxle as well as controlling spark and fuel mix. Many vehicles also have a climate control computer which controls the A/C and heat. Luxury cars often have vehicle anti-theft controlled by computer: some even will adjust the seat and steering wheel to suit different drivers when they enter the car!!!
The downside to all this "smarts" on a car is obvious: what happens when something breaks? The good thing is that the onboard computers themselves are very reliable. The problem is that the computers rely on a whole flock of sensors and wires to give them the data needed to make your car run. These sensors are not nearly as reliable as the computer itself, in fact they fail quite often!
This is where a "limp home mode" comes into play. Whenever the vehicle computer gets a reading from a sensor that is obviously wrong, it will "assume" a value that it "knows will work". On the earliest computer controlled cars with feedback carburetors, if the computer got bad readings from sensors, it would run the carb at the richest setting. You would get horrible gas mileage, but the car WOULD run. The computer would then turn on an amber "CHECK ENGINE" light. It would also store a trouble code in its memory telling what sensor was giving a "bogus" reading.
The newer computers are much more sophisticated, and just because a "CHECK ENGINE" light comes on doesn't really mean the computer is totally in a "limp home mode". Depending on what sensor reading is out of specs the computer may still be doing a pretty good job of controlling the engine. For example, some cars can have the "CHECK ENGINE" light come on if you don't tighten your gas cap tight enough after filling up!
On most vehicles the "CHECK ENGINE" light will go out if the sensor starts giving normal readings again, although some computers will make you use a scan tool to turn the light off.
This basically looks like the sensor to me, try getting that fixed for good.
Kindly let us know for any future assistance.
Thanks
Fame !

Posted on Jul 09, 2009

  • 202 Answers

SOURCE: EML, Check Engine, Limp Mode

What is limp mode, and it is MiL light( mal function indicator light)it is not EML. Please specify so i can help

Posted on Jul 24, 2009

SOURCE: 1992 3000gt automatic stuck in limp mode,(3rd and rev.) HELP!

the car has the capablilites to give data and codes. You gunna need a professional if you dont have access to a scanner and multimeter. Otherwise were just guessing.
I hate telling people that its out of their hands but sometimes its best to let the pro diag it and then you can repair it if you capable

Posted on Nov 26, 2009

nvannoy
  • 234 Answers

SOURCE: having problems with my 1998 Saab 900 se turbo,

Based on the information you have provided your problem is one of two things
1.Bad fuel pump -to check this have the fuel pressure tested if above 40psi you should be able to start the vehicle. (you can borrow/rent a fuel pressure tester at an auto parts store)
2.Bad crank and cam sensors -these are what tell the injectors to fire, so if you have good fuel pressure to the injectors but still no start I would replace both the crank and cam sensors.

Posted on Jan 27, 2010

  • 159 Answers

SOURCE: Went on trip, drove a little over 500 miles to

PO456 is most times a gas cap or gasket,
to get an incorrect gear ratio the transmission has probably started to slip.

Change the fluid and filter first off in the transmission and use only atf+4 fluid and possibly the govenor pressure sensor,and change gas cap.

Posted on Jun 03, 2010

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It has been doing great but one day last week I drove it down the road and at 30mpg it started shuddering, it stopped at 35 and does great at highway speeds?? Help me please!!! Jan


If it's automatic it may not be selecting lower gear at lower revs.
other possibility is the engine management light is coming on.this is a yellow car icon on the sash.if this does come on then the car automatically goes into limp mode where it can't go faster than 30 mph to protect the engine.all sorts of reasons for it doing this low oil ....low oil pressure ....low brake fluid etc.get it to a garage and let then check ecu for any fault codes.but it does sound transmission related whereby the gears are fine when the revs are up but once you ease off accelerator it dies suggesting gears not dropping to lower gear or vacuum leak.

Mar 25, 2015 | 2001 Mitsubishi Montero

1 Answer

Transmission for 1999 cara van


did you check the fluid in the transmissin it could be low or also it could need a new transmission filter i wouldnt try to drive it it anymore without checkin or changin it because it will burn it up

Feb 16, 2013 | 1999 Dodge Grand Caravan

2 Answers

1 month ago my x type went into limp mode. Mechanic had it for three days and could find nothing wrong. Then today it went into limp mode four times. No warning lights on dash


The only time a vehicle goes into limp mode is when there is ****** problems, so I would take it to the ****** shop for code retrivel and if I am not wrong there might be problem with the Input/Output speed sensors BUT do have it checked first.

Sep 16, 2011 | Jaguar X-Type Cars & Trucks

1 Answer

Went on trip, drove a little over 500 miles to destination. When went from one freeway to another car seemed to go into a limp mode after slowing to bout 20- 25 mph. I reset by putting it in park turning...


PO456 is most times a gas cap or gasket,
to get an incorrect gear ratio the transmission has probably started to slip.

Change the fluid and filter first off in the transmission and use only atf+4 fluid and possibly the govenor pressure sensor,and change gas cap.

Jun 02, 2010 | 2003 Dodge Intrepid

2 Answers

1992 3000gt automatic stuck in limp mode,(3rd and rev.) HELP!


the car has the capablilites to give data and codes. You gunna need a professional if you dont have access to a scanner and multimeter. Otherwise were just guessing.
I hate telling people that its out of their hands but sometimes its best to let the pro diag it and then you can repair it if you capable

Nov 26, 2009 | 1992 Mitsubishi 3000GT

2 Answers

Transmission Limp Mode


YOU NEED TO CHECK POWER AND GROUND CIRCUITS TO TCM

May 20, 2009 | 2000 Plymouth Voyager

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