Question about 2001 Mercedes-Benz CLK-Class

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Limp mode Ig elec fuse is blowing could this cause the limp mode

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Have to find out why the fuse blows
What is wrong with that circuit
Then you see if you have another problem
causing it to go into limp mode
If you look at a wiring diagram & had a factory
manua,l you could learn the vehicle strategy
Without both, your pretty much done & have to
pay a shop that won't educate you, if they even
have a clue

Posted on Jul 16, 2013


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Fuse # 21 blows when igtion turned on.what causes this?

Whatever accessory or system is powered by fuse #21 has a short. It only blows when the ignition is turned on because no power goes to the fuse with the ignition off. If your transmission is in limp in mode, you need to have it checked. You don't mention make, model, or year vehicle, but your car may have a separate transmission control module (TCM); in any case see if you have any codes that indicate if there is a problem with the transmission. The O2 sensors have nothing to do with the transmission being in limp in mode, and I doubt that they are connected directly to the fuse. Most O2 sensors get their power through the PCM.

Oct 25, 2016 | Cars & Trucks

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Engine bay fuse 14 blowing causing limp mode and rear brake lights to come on after travelling 2-3 miles. Pulling plug off oxygen sensor does not stop fuse blowing

What make model an year ? What is fuse #14 for O2 sensor heater circuit ? Do you know how to do electrical trouble shooting , how to test for a dead short to ground ? Fuse #14 probably powers multiple thing's ! Go on youtube check out video on finding shorts . Also go to free wiring diagrams , enter vehicle info . make , model , year , engine size ,then under system click on electrical distribution , then under subsystem fuse panel an see what all that fuse powers . Isolate the circuits one at a time till fuse doesn't blow . Then with DVOM - digital volt ohm meter test the circuit .

Apr 27, 2016 | Cars & Trucks

1 Answer

Oxygen sensor fuse blowing causing limp mode and rear brake lights to come on even with sensor runs for a few miles then goes into limp mode

The only reason I can think where a fuse would be used for 02 sensor is the sensor heater circuit, maybe circuit is shorted to ground?
I need year--make--model??

Apr 27, 2016 | Cars & Trucks

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Most limp modes are caused by transmission faults but can be caused by engine sensors and blown fuses. If your car is in limp mode the fault will be stored in the ECM.
You need to read the fault codes stored in your ECM to know which sensor has caused this problem. You didn't say what model vehicle you have and it would take a number of hours to list all the possible codes and reasons.
Get someone with a code reader for your model vehicle.

Sep 17, 2015 | Cars & Trucks

1 Answer

Blowing brake light fuse

you might want in this case try a higher rating fuse, example is if the fuse is 15 amp rase it to a 25 amp fuse,try not to go over 40 amp if possible,if that still blows it is more than likley a shorted switch or a bad relay causing the overload or short. after the fuse change an still a problem chech the relay for the break lights next,these are located in the engine compartment and on some models in the trunk,good luck,Gary

Oct 28, 2013 | Cars & Trucks

1 Answer

Limp mode issues

You need to find out the transaxle strategy for going into
limp mode
You need a trans shop or a dealer
Have it towed on a rollback ,not flat towed or driven

Jul 24, 2013 | 1999 Mitsubishi Galant

1 Answer

Reverse light fuse is continually blowing 1999 mitsubishi galant

The speed sensor is probably the root of your problems. Likely the reverse switch wiring is routed through the harness for the sensor. That could also be the reason it goes into limp mode. Change the sensor and see if all problems are resolved. Good luck.

Jul 24, 2013 | 1999 Mitsubishi Galant

2 Answers

Fuel pump just stopped,ECU-I.G fuse burnt changed fuse , still don't hear pump,if line was blocked would pump shutdown?


Jun 08, 2011 | Toyota Xtracab Cars & Trucks

1 Answer

I just rebuilt my 4l60e and reinstalled and now i have reverse, manual 1, manual 2 and nothing more. there was a check ball stuck in the separator plate i just assumed it was stuck from trash or...

Note that many problems that show up as transmission issues are actually PCM or electrical, and may be external to the transmission. Try a different PCM, and check for chafing where the cables come out of the PCM.

The transmission is on the same fuse as the MAF, O2 sensors and at least one other sensor - if an O2 shorts out, it will blow the fuse and the trans will go into limp-home mode. Be sure the trans has power and the fuse is not blown before doing anything else.

Limp mode is a fault mode in which the transmission either loses electrical power or the PCM deactivates all of the electronics. The transmission will default to max line pressure. The driver will have Reverse and 3rd, with manual 2nd available by putting the gearshift in 2 or 1 (doesn't matter). 1st, 4th, and TCC lockup will not be available. It will not hurt the car to drive it like this for short periods, but use manual 2nd to get the car moving, and be aware that the trans will generate more heat than normal while operating in limp-home mode due to increased torque converter slippage during 2nd gear starts and no lockup in 3rd gear.

Check the wire harness clip on the transmission, passenger side by the catalytic converter. Look for any damages due to corrosion or brake in the wire leads. it's common for the clip to brake and the wire harness to loosen causing the transmission in to limp mode. Good luck and keep me posted, be glad to help you get your transmission running again soon and please rate.

Check for check ball wear on the separator plate and address it if needed. The 1-2 check ball wears out and sometimes the check ball blows through or sticks in the plate causing troubles.

Just thought I would point out a few items to think about. Good luck.

Jan 10, 2010 | 1995 Chevrolet Tahoe

1 Answer

Blowing o2 sensor fuse and then not charging battery

Which fuse is blowing and When it goes into limp have you had it scanned for codes. If the TCM goes into limp then it will have a code in the computer memory.

Jun 17, 2009 | 1999 Dodge Intrepid

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