Q: Warning lights appear and car goes into limp mode

asked by on August 16, 2016

The stability control, airbag, and engine lights came on while I was driving a few days ago and when they did, my SUV went into “limp mode” and decreased in engine power. It was sudden and totally unexpected. Fortunately it did not cause an accident, but it could have and we would not have had any airbag safety. This has happened several more times before I could get the car into the shop. On the first visit, they told me that if the engine light was not amber or flashing, then it was safe to drive the SUV. It has been 30 days and my vehicle is ‘still’ in the repair shop. They have not found any solution for this problem. Can you give me suggestions and/or advice how I can get this problem fixed?

Hello. Limp mode is a feature that was set in place to protect the engine and/or transmission from further damage, and to give the driver enough time to get off the road in the event of a serious engine malfunction. Most commonly, when a vehicle goes into limp mode, it is the result of there being a problem with one or more of the vehicle’s computers. There are multiple possibilities for why your vehicle went into limp mode. This could have happened as a result of a problem with the speed sensor, the manifold absolute pressure (MAP) sensor, the throttle position (TP) sensor, or the line pressure, shift timing, or sequence of the transmission.

However, these are only some of the possibilities of what may be causing your vehicle to be in limp mode. It is unusual that it has taken 30 days for the shop to diagnose this problem. The dealership might be a better alternative as dealerships have more access to information that may be necessary to properly diagnose this problem. They also have specialized computers that would be able to pinpoint the problem fairly quickly. My suggestion would be to have the car transferred to a dealership to have a proper diagnosis completed.

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

What Should I Do If My Tire Has a Nail In It?
Getting a nail or other foreign object stuck in your tire (https://www.yourmechanic.com/article/is-it-safe-to-drive-with-a-nail-in-my-tire) can be irritating. Most of the time we do not notice that a puncture has occurred until we come out to the vehicle and the tire is flat....
How do I reset the maintenance reminder?
Regular maintenance is vital for ensuring that your car lasts as long as possible and that it performs correctly. You should have your tires rotated regularly, your oil changed on time, the transmission serviced when necessary and more. A handy...
Antitheft system isn't recognizing key
The anti-theft system in your vehicle will prevent the computer from delivering fuel and spark to the engine if it does not recognize the chip inside your key. Your specific vehicle also requires a minimum of 2 keys programmed to...
RPMs erratic during idling, Check Engine Light on, P0174 code
Hello. The P0174 code (https://www.yourmechanic.com/article/p0174-obd-ii-trouble-code-system-too-lean-bank-2-by-blake-griffin) deals with the truck running lean. That means that the PCM is restricting fuel to the injectors. This is usually caused by a vacuum leak (https://www.yourmechanic.com/article/is-it-safe-to-drive-with-a-vacuum-leak) in the engine. There could be a leaking intake...
resetting blend air actuator
The a/c door actuators do not need programming. I think what happened is the door was in the incorrect position when you put in the actuator. What you need to do is remove the actuator and leave the actuator electrical...
When I accelerate quickly the Check Engine Light comes on.
This may be related to many different things, such as a failing throttle position sensor (https://www.yourmechanic.com/services/throttle-position-sensor-replacement) or a bad mass air flow (https://www.yourmechanic.com/services/mass-airflow-sensor-replacement) sensor. The throttle position sensor relays the position of the throttle plate relative to your foot's position...
Many issues with the car. Can a clogged catalytic converter cause transmission issues?
The catalytic converter has very very little to do with the transmission. The catalytic converter will keep the engine from being able to "exhale" and can cause engine problems and damage if faulty, but it wont cause direct transmission issues....
My car won't go over 20 mph. It will start to shake vigorously once it hits 20 mph
Hello. The codes that you have listed are for engine misfires. P0300 is for random misfires, while P0304, P0305, and P0306 are for specific cylinder misfires. Misfires can be caused by many things. If you have already replaced the MAF,...
Battery light
It is possible that the belt tensioner for this belt or belts has failed. If there is no tension on the Belt then it will not spend with the crankshaft pulley. I would recommend having your belt tension inspected by...

Related articles

Tips for Taking Care of Your Exhaust System
Your Your car’s exhaust system might not be the first thing you think about when it comes to engine performance or personal safety, but it should be pretty high on that list. Your engine combusts fuel and air in order...
P0444 OBD-II Trouble Code: Evaporative Emission Control System Purge Control Valve Circuit Open
P0444 code means a there is a problem with the EVAP circuit due to faulty pressure or flow sensors, electrical wiring, fuel tank / lines, or gas cap.
P0547 OBD-II Trouble Code: Exhaust Gas Temperature Sensor Circuit Bank 2 Sensor 1
P0547 means that the PCM is reading a malfunction in the exhaust gas temperature sensor circuit due to faulty wiring, sensor issues or exhaust leaks.