Q: What does the reduced engine power Warning Light mean?

asked by on

What does the reduced engine power Warning Light mean?

The purpose of the “Reduced Engine Power” Warning Light is to alert drivers when/if there is a serious problem with the transmission and/or one or more of the engine system components. When a fault/error in the transmission or engine triggers the Reduced Engine Power Warning Light, the vehicle will experience an extreme loss of power and performance and vehicles may not be able to exceed speeds greater than 20 miles per hour. The Powertrain Control Module (PCM) will store one or more diagnostic trouble codes for the purpose of diagnosing the fault/error in the system.

An issue or malfunction in the throttle control system is most common when the Reduced Engine Power Warning Light illuminates in the dashboard. However, there are other components and systems that will trigger the Reduced Engine Power Warning Light, in the event of a problem.

  • Defective throttle position (TP) sensor
  • Defective oxygen sensor
  • Defective accelerator pedal position (APP) sensor
  • Loose or damaged wiring
  • Defective throttle body
  • Defective powertrain control module (PCM)
  • Any fault/error that will affect drivability function
  • Any fault/error that will affect vehicle performance
  • A fault/error in the emissions system
  • A fault/error in the throttle control system
  • A fault/error in the transmission system

The Reduced Engine Power Warning Light is considered extremely serious because of the immediate and severe drivability problems that will be present until the engine or transmission fault/error is repaired. If the Reduced Engine Power Warning Light is ON in your vehicle, contact a mechanic, such as one from YourMechanic, to have it diagnosed and repaired.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1,000 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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!
  1. Home
  2. Questions
  3. What does the reduced engine power Warning Light mean?

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: How Does a Radiator Work to Cool Off an Engine?

Q: Dynamic Stability Control light on and stuck in 3rd gear

There is likely a wheel speed sensor issue causing the DSC light to be on. It also sounds like your transmission is in "limp' mode - being stuck in 3rd gear. The problem codes, and professional interpretation, will provide more...

Q: Engine die when get hot

If your engine is shutting off when it gets hot it is possible that it could be overheating. Many vehicles have a feature built into the engine that will kill the engine if it reaches a certain temperature. For an...

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...
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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.