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.

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?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. EPC Check Light is on followed by an engine fault

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: My Toyota corolla 2009 model (1.8 GLI, Mileage 94000 Km ) is very good but since last 2 year on its Mileage 70,000Km, its steering

The issue with your vehicle is either the tires are low on air pressure and need filled up or the Electronic Power Control Motor has stopped working and is no longer allowing the vehicle to have a power steering. If...

Q: Q: Engine running rough

Quite a few things can account for an engine running rough. It could be just one cylinder misfiring, or multiple. If the Check Engine Light is on, the computer has detected a problem and the code(s) will help narrow it...

Q: Brake booster signal failure

It is possible that your master cylinder may be failing on your 2014 Dodge Dart. The master cylinder can be full and still cause issues. If the internal seals inside the master cylinder begin to fail, they will allow brake...

Related articles

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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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.