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Hi, EPC stands for Electronic Power Control. this means that your vehicle has a fly-bywire system, whish means that there's No accelerator cable and the throtle body is controled by the ECM (Engine Control Module). The Accelerator pedal (or gas pedal) it's just a sensor, so no mater what your input is on the pedal the ECM actuates the throtle how ever it wants. scary hu!!!, but have no fear, the Accelerator Pedal Module hoses two TPS sensors(Throttle Position Sensors), G79 & G185, this two produce an increasing voltage as you press on the gas pedal, but at diferrent rates for safety, the Throttle Body Control Module J338 (throttle body) also has two sensor G-187 and G-188, aswell as Throttle Drive Motor G186, G-187 and G-188 the output voltages mirror each other for safety reasons. back to your epc light, when you say reset it, do you actually clear the fault codes with a scanner, or you just cycle the ignition switch? either way if a fault for the brake light switch is present, this means most likely your problem is the brake light switch, some cases that brake light switch does not trigger a fault for still malfunctions and triggers an epc related code, i would replace the brake light switch, clear faults and test drive the car. so if you have anymore questions or if you can provide me with more info on the fault code numbers and descriptions, and if your vehicle is manual or automatic, please do, thanks...
i would replace tha brake light switch first, it's the easiest and reletively inexpensive, if you could come up with fault codes it would be much help full, i don't understand why the repair shop say there were no faults, usually when an epc light trigers it stores a fault in the ECM, since it's part of the ECM, they aded another light ( the EPC light) because the Check Engine Light is more emmision related isues only, so in order to alert you of an Electrinic Power Control fault they aded a light, by the way, thanks for accepting.