Engine power reduced

My Engine Power Reduced light came on after I was driving to work when it was raining a lot here in Rialto / Fontana area. It was flooded on the freeway and didn't see the flooded area

My car has 133956 miles.
My car has an automatic transmission.

Experienced mechanics share their insights in answering this question :
Hi there. Sometimes when you drive through standing water some electrical problems will occur. If you have a warning light that comes on shortly after, it’s possible that the sensor that triggered this code may have done so because of the excessive water. In order to determine if the light is "real", you’ll have to have a professional mobile mechanic complete a check engine light inspection first.

How to Identify and Fix Common car Problems ?

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Shut off the engine, wait 10 seconds, then restart the vehicle to see if this resets the reduced engine power light—but this will only work if it`s a signal error. Avoid driving your vehicle when the reduced engine power light is on—instead, identify and repair the underlying problem that`s causing the warning light.
The reduced engine power warning light shows that something has reduced the flow of fuel and/or air to the engine. It often turns on when a car needs maintenance or repair and doesn`t mean your vehicle is about to break down, but it could be a good time for an oil change.
Fuel injectors may become dirty over time and not be able to provide as much fuel to the cylinder as is needed. Dirty fuel injectors may cause the engine to run lean which will in turn, cause hesitation when accelerating.
It depends on the cause of the reduced power. Often, the problems are minor. In rare cases, though, reduced power can cause more serious problems like a seized engine, or even an electrical fire.
It is generally safe to drive with the “Reduced Engine Power” light on, but you should take your car to a mechanic as soon as possible to avoid further damage.
Engine Power Loss

Your high-performance engine will lag if the O2 sensor is bad and tricking the engine control unit (ECU) into putting too much air in the combustion chamber. This creates a lean fuel mixture in the chamber and causes sputtering and power loss in the engine.

A dirty air filter reduces the amount of clean air that is getting through to the engine, decreasing its power and performance. Replacing your dirty engine air filter with a new, clean one can improve the acceleration of your engine.
A misfiring engine means the spark plug wires are not firing properly. This causes many problems, like increased exhaust emissions, reduced fuel economy, and reduced engine power.
A Reduced Power light usually indicates a fairly serious problem with the throttle system. When this light illuminates the vehicle will often go into a “safe mode”, which will severely limit the speed of the car and in some cases will render the vehicle un-drivable.
There are several causes for your car to lose power significantly while accelerating. The most typical causes of a car not accelerating while driving include a faulty sensor, contaminated fuel or air filters, or a faulty timing belt. Generally, this isn`t something you should ignore.
Of course…. Failure to change motor oil on time can lead to many problems. For instance, if you don`t change motor oil in your car on time; Its power output will reduce.
Expect to pay between $100 and $500, including parts and labor, to get your engine back in shape. However, a catalytic converter issue can cost over $2,000.
Limp mode is meant to give your car just enough power to drive home (or to the nearest repair shop) without causing severe damage to the engine or transmission. You can bypass limp mode by restarting your car, topping off fluids, or resetting the battery.
A dirty air filter reduces the amount of clean air that is getting through to the engine, decreasing its power and performance. Replacing your dirty engine air filter with a new, clean one can improve the acceleration of your engine.
When this warning indicator light comes on in the dashboard, this could be an indication of several issues such as faulty wheel speed sensors, a faulty steering angle sensor, a faulty rotational speed sensor or a problem with the steering rack.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Reduce engine power / check engine light is on
ANSWER : Hi there. Most of the time, reduced engine power is caused by a restriction of fuel, or the throttle body’s inability to efficiently mix air and fuel. This could be caused by a failing mass air flow sensor, EGR valve or other fuel system components. Since the check engine light is on, you should have a professional mechanic complete an inspection at your location to determine what codes are stored and which components require repair. This should resolve your issue.

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Engine malfunction light, reduced engine power, engine powered down
ANSWER : Hi there. There are a lot of things that can cause this on your 2012 BMW M5. I usually start by scanning the computer for codes to see what comes up. If there are not codes then I load test the alternator and the battery to see if they are failing. Low voltage in the electrical system will cause this. If that is fine, then it is usually caused by a failing throttle body. I have seen a lot of these fail due to the motors in them hanging up. If the problem is only happening intermittently, this can make the issue hard to duplicate, but you can still have tests done on the car. If you are going to have this fixed, consider YourMechanic, as a certified mechanic can come to your home or office to test the vehicle and diagnose the Engine Malfunction Light.

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Car sometimes give me acceleration and power issues. Engine power reduced message and engine light appear intermittently.
ANSWER : It is possible that your vehicle’s PCM has failed. This is somewhat of a common problem amongst many GM vehicles. If the computer has failed, this could be one of the reasons that no trouble codes are appearing and the fact that the problem is intermittent. It is possible that the computer is somehow getting overheated and by stopping the vehicle for a short period of time, the PCM cools down allowing the vehicle to run again. I would recommend having your PCM tested for proper function by a certified technician with experience in computer diagnostics.

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My car is having power issues. I get a message that says engine power reduced/ service traction along with headlights flickering and engine cutting out.
ANSWER : Hi there. Check the battery and alternator to the vehicle. With all of the electrical issues that you are having, it sounds as if the battery is not charged and making the engine stall out due to lack power. Check the battery for a 12.6 volt reference and load test the battery. If the battery fails, then replace the battery. If the battery passes, then check the alternator and see if its putting out the full amount of amps. If you need further assistance with electrical issues, then seek out a professional, such as one from Your Mechanic, to help you.

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Error code p1516 with check engine and reduced engine power unable to drive over 30mph car is revving up put no power
ANSWER : The code P1516 is is for the throttle position sensor. It looks like the car’s computer is putting the engine in "failsafe mode" to prevent the car from being driven much further. A technician would need to examine the system firsthand to accurately diagnose the code and make the correct fix. A certified technician from YourMechanic can come to your car’s location to thoroughly inspect the car and let you know how to best proceed.

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If you temporarily have reduced power to the engine and take your car to the garage would you expect them to check the cam belt?
ANSWER : If the reduced power problem was intermittent, a mechanic would not have had a reason to check the cam belt to see if, for example, the belt jumped timing which itself is a cause of reduced power. Shop practice varies widely insofar as customer notification of "required" maintenance. On many vehicles, the list of items involved in such maintenance can be extensive and so unless the customer makes a specific request to be brought up to date, or you have a specific service agreement, you are probably not going to get a careful and complete accounting. The best thing to do is rely on the published maintenance schedule for your car. That schedule is accessible from the Owners Manual and is published on the Internet, too. In lieu of that, if you desire you can book a vehicle inspection and a certified mechanic will come to your location and both review the maintenance schedule with you to see what has or has not been done in the way of required maintenance and/or the mechanic will simply thoroughly inspect the vehicle to determine what may be required. If you have further questions or concerns as you decide what to do, do not hesitate to re-contact YourMechanic because we want you to make the most of your repair dollars and help you get the best possible results.

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Warning: Engine Malfunction! Reduced Power: Engine is operating at reduced output
ANSWER : This is a sign of your car’s automatic fail safe mode. When your car’s computer detects that something has gone wrong in one of it’s major systems, it will send the car into what is known as a "limp mode" or "safe mode" which dramatically reduces power to the engine to a minimal amount, just to get you where you need to go. When this happens, the car will be inoperable for the most part and will need to be looked at by a qualified mechanic such as one from YourMechanic. I would recommend having one of our experts come to your location to take a look at the car and make a proper diagnosis.

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2012 equinox reduced power light engine light and traction light came on. Lost a lot of power got home and all light except engine
ANSWER : Your car has what is called a "safe mode" that will be engaged by the computer when it detects that something critical has gone wrong related to any of the major components in your engine chassis or power train. This may be related to a number of things, most of which should have been registered in the computer when the check engine light came on. I recommend having an expert from YourMechanic come to your location to inspect your check engine light and diagnose any codes registered by your vehicle’s computer.

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