Q: Car keeps going into limp mode.

asked by on December 07, 2016

Ever since problem appered we have replaced throttle body because of the sensor and the car brake pedal. Both problems were described when the check engine was on. Disappeared when replaced. But now it keeps going to limp mode whenever it feels like it (it can be hot or cold i could drive a while or as soon as I turn it on happen 3 times a day or once every 3 days). Now it says that the problem is electrical communication failure (what the mechanic read when he scanned it when it was in that state). But now we cant manage to get it like that so he could fix it. Any ideas where to start looking?

My car has 120000 miles.
My car has an automatic transmission.

Loss of power Inspection $79.99 - $99.99 Get a Quote

Hello. When this vehicle goes into limp mode it is usually because the computer is trying to protect the power train from damage. Most of the time when this happens intermittently it is due to a voltage issue. I usually start by checking the ground connections and the ignition switch to see if there is any voltage drop in either one. I have seen a lot of issues the the negative battery cables having corrosion or loose connections and causing this. If the connections and the ignition switch are fine then I check the computer data lines. If the computers are not communicating right then this will also occur. This is not as common. This is assuming that the throttle body that was replaced is good and has good connections. If you are looking to have this repaired, consider YourMechanic, as a certified mechanic can come to you to [diagnose why the car is going into limp mode] https://www.yourmechanic.com/services/loss-of-power-inspection

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing


Experienced Mechanic?

Earn up to $70/hr

What others are asking

Coolant leak in rear of engine

You would need to have the leak better identified as to why it is leaking so a mechanic or you can replace the bad part or gasket. If you can supply a picture of component leaking then I can better...

Creaking noise from front and rear of car when accelerating from a stop and sometimes when I brake to a stop.

It sounds like you may have some worn suspension components. Things like shocks/struts, sway bars and control arm bushings when worn will make this kind of creaking sound when the weight of the vehicle is transferred during stopping and starting...

Change engine oil soon

This change oil soon light is telling you it is time to get the oil and filter changed. Whoever changes the oil and filter for you will need to reset the light for you so you can start fresh until...

Turn signals and hazards don't work 2005 Pontiac Grand Am

Hello - the problem you are experiencing is a failure of the turn signal/hazard warning flasher unit. The flasher unit performs the flash function for both your turn signals, and the emergency hazard flasher function. I recommend a turn signal/hazard...

Is it illegal to remove the stock steering wheel for an aftermarket one in Illinois?

Since this involves something that is a matter of a safety, we are not allowed to definitively comment on whether or not this would be illegal. You will need to check with your state's transportation safety department with regard to...

Slow/no acceleration high RPMs

Hey there. When the transmission control module detects a problem (i.e. faulty sensors, low fluid, etc.) the Check Engine Light will come on, and it will go into a "limp" mode. This limp mode will cause the car to drive...

Slow crank, eventually turns on. Sometimes takes 10 mins to build the crank up

Hi there, thanks for writing in. I'd be happy to provide some insight. If the engine is cranking very slow, then it may not start well. You should have a starter voltage drop test in order to isolate if the...

RPMs go up and down

Hello. Your car is equipped with a computer-controlled transmission, so a scanner should be connected, the system checked for codes, and the data analyzed. This vehicle doesn't have a dipstick for the transmission, so a special procedure must be followed...

Car makes grinding sound

The alternator is one of the most common problems, as is the idler pulley. These would need to be checked to see if this is the noise. The best way to diagnose the problem is to have a mechanic listen...

Related articles

A Buyer's Guide to the 2012 Nissan Titan
With With the 2012 Titan, Nissan continues its march into domestic territory. This model lives up to its name, but it’s also quite impressive inside as well. Even if you are in the market and wouldn’t normally consider a truck,...
A Buyer’s Guide to the 2012 Nissan Versa
In In the world of subcompact sedans, the Nissan Versa is a serious contender. Not only does it come with a low price tag, but it also includes a lot more features than you’d expect for a subcompact, especially one...
How to Get Nissan Dealership Certified
Nissan dealerships offer auto technician jobs to those certified through Nissan’s Service Career Opportunities for Professional Enhancement program.