Skip the auto shop - Our mechanics make house calls

Q: What does the powertrain malfunction/reduced power (RTT) Warning Light mean?

asked by on

What does the powertrain malfunction/reduced power (RTT) Warning Light mean?

A: The Powertrain malfunction/reduced power is...

The Powertrain malfunction/reduced power is a warning that is illuminated when the vehicle is experiencing a condition - that if driven can cause damage to the engine, transmission or drivetrain. The warning is to let you know to decrease the load on the vehicle (typically speed) and is close to defaulting into a limp home mode for protection if it has one. Typically with this warning a code is set in one of the component located in the powertrain (engine control, transmission or traction control/ABS). It is possible that if it keeps occurring that it can activate another warning. If the problem resolves itself the warning may go away.

For example, if you have a heavy load, perhaps towing a trailer, and are going up a hill, and the transmission is starting to overheat. To avoid further damage the warning “Powertrain malfunction/reduced power” is illuminated to warn you to take steps like ease off the load to avoid overheating the transmission. If you decide to ignore this warning the vehicle may go into a limp home mode where the computers will cut back on the throttle and operate in a safe mode it knows is safe till the issue has been resolved, and the transmission temperature has cooled down.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
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

Get a quote

What others are asking

Q: Where is the vehicle identification number (VIN)?

The vehicle identification number (VIN) is the legal identifier for your vehicle. You can find your VIN on the left side of the dashboard, where it meets the windshield.

Q: How do I shift between 2H, 4H, and 4L?

The different gears are designed to help you navigate uneven terrain. There are a variety of gears for you to choose from so you find the one that best suits your needs. To shift between 2H, 4H, and 4L. ...

Q: How do you check the level of coolant in the radiator?

In most situations, you shouldn’t have to check the radiator itself. You should be able to inspect the level of coolant in the reservoir/reserve tank instead. However, if the there is no coolant in the reserve tank, you’ll need to...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...