Skip the auto shop - Our mechanics make house calls

Q: EPC Check Light is on followed by an engine fault

asked by on

EPC check light came up followed by engine fault and can't do acceleration..meaning that engine breakdown..i had to stop at the roadside and switch off the key and turn on(restart) before the car can run again..but EPC will come out again after the car few miles running..the engine felt unstable though..

My car has 97038 miles.
My car has an automatic transmission.

A: The EPC light refers to the Engine Power Co...

The EPC light refers to the Engine Power Control indicating a potential engine malfunction which is a general warning that could mean many different things such as the engine speed sensor, mass airflow sensor, or other issues related to throttle body function. In your case, the lack of acceleration and engine stability is a common sign of a failing mass air flow sensor.

The mass airflow sensor is a unit in the intake system that monitors air intake as it is mixed with fuel prior to being injected into the motor. When this fails, this can cause an imbalanced air/fuel load to be supplied to the motor which results in an over fueling or under fueling situation depending on the conditions.

To avoid any unnecessary repairs, I would suggest having a professional from YourMechanic come to your home to diagnose your EPC warning light firsthand and service your mass air flow sensor if necessary. Best of luck.

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

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!

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: Need problem associated with EPC and ABS Lights fixed.

The EPC Light is for the electronic throttle body. You need to have a qualified technician check the codes on the computer to determine the problem. You may just have a loose vacuum hose connected to the intake. The ABS...

Q: Transmission engine comparability

Hey there. As long as the engine you have currently bolted to the 700R4 is NOT a 4 cyl or V6, it should bolt up to the TH400. TH350s, TH400s (except those in a Jeep), and 700R4s (except as noted...

Q: What does the low fuel warning Light mean?

The low fuel Warning Light is located on the instrument panel, and illuminates when your vehicle is running low on gas. When this light comes on, refuel your vehicle as soon as is safely possible, at which point the light...

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...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.