Q: I got a message sayin Engine Power Reduced

asked by on June 08, 2017

Engine Power Reduced message What does that mean? Can I not drive my car?

My car has an automatic transmission.

Reduced Power light is on Inspection $79.99 - $99.99 Get a Quote

The issue you are writing in about is common enough that a specific diagnostic, namely a Reduced Engine Power Warning Light Diagnostic is performed by technicians dispatched by YourMechanic. If you request that diagnostic, the responding certified mechanic will get this issue resolved for you. In your circumstance, the vehicle’s powertrain control module (PCM) has undoubtedly stored one or more diagnostic trouble codes that will identify the "general area" in which the fault lies in the engine management controls. Although the throttle control system is a common trouble area when the Reduced Engine Power Warning Light illuminates, there are quite a few other components and systems that could come into play and, of course, there is always the possibility of multiple, or "coincident", faults. Here are some of the possibilities that YourMechanic dispatched technicians would consider:


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) (not typical; ONLY if a long, long list of other possibilities is ruled out)
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 control system


The Reduced Engine Power Warning Light is considered serious because of the immediate and severe drivability problems that will be present until the engine or transmission fault is repaired. If you request the recommended diagnostic the mechanic will get this resolved for you. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

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

While driving, car power steering stopped working. It got tight. Brakes,gas stopped working. 4 way flashers lights started blinkin

This is an electrical malfunction and is what is referred to as a "global" malfunction. That means a principal circuit, or circuits, was interrupted obviously on an intermittent basis. Battery terminal corrosion is possibly implicated at least as a contributing...

Battery light flashing at low rpm basically at idle my battery light flashes

Claimed by Jeff Engstrom

Wrench light came on truck has no power and the rpms constantly get higher if put in park

Hi there: The wrench light is service light indicator that alerts the driver that maintenance or service is due for a component. Most of the time, scan that Auto Zone will complete uses a basic scan tool, which does not...

Car is leaking coolant and overheating

You should not let the engine ever run low on coolant. When you get the system checked the mechanic will pressure test the cooling system and locate the leak or problem for you. You should not have a hot engine...

Heater hose is leaking

Hi. Hot coolant is pumped through the heater core. Heat from that coolant is then blown through the heater core and into the passenger compartment by the blower fan. Signs that your core is leaking include moisture on the passenger...

How do I use the headlight aiming control?

If you have a lot of weight in your vehicle, or are traveling up a steep hill, the headlights may be angled too high. This can cause visibility issues for not only you, but also any vehicle in front of...

Mazda not starting.

If your engine is cranking over at a normal speed but not starting, your battery would likely not be the cause of the no start condition. If your car is not cranking at all, then yes, a battery with low...

Related articles

A Buyer’s Guide to the 2012 Chevrolet Malibu Hybrid
The The 2012 Chevrolet Malibu ECO hybrid is an interesting car in the world of mid-size family sedans. Unlike other popular hybrids, it doesn’t have a full-sized electric motor that takes over when the car starts. Instead, it uses eAssist...
2012 Chevrolet Malibu vs. 2012 Ford Fusion: Which One Should I Buy?
When you want a midsize sedan, you’re looking for something that will offer you the best fuel economy for the size as well as additional safety features that will keep your family safe while you’re driving across town or around...
A Buyer’s Guide to the 2012 Chevrolet Suburban
The The 2012 Chevrolet Suburban offers large amounts of space to carry around a growing family or to transport supplies to your favorite camping spot. It is available in heavy duty and half ton models. Key Features The 1500 Suburban...