Why does the Audi Q5 engine shake when the EPC light is on?
2 Answers
After the EPC warning light comes on, the most likely cause of vehicle shaking is a damaged throttle control unit. Main reasons for the EPC light activation: 1. Dirty throttle body - this situation only requires cleaning the throttle body followed by recalibration. 2. Other causes include damaged throttle control unit, damaged engine control wiring harness, faulty accelerator pedal position sensor, leaking crankcase ventilation system, intake system leaks, faulty brake light switch, and burnt-out brake light bulbs. 3. Issues with the intake side bridge bearing causing insufficient oil pressure due to poor sealing, resulting in slower regulator response, which triggers a fault in the engine control unit.
As an experienced driver of an Audi Q5, I've encountered situations where the EPC light came on accompanied by engine shaking. This is often caused by a dirty or stuck throttle valve leading to uneven air intake and vibrations, or worn-out spark plugs causing uneven ignition and affecting engine smoothness. Low fuel pressure can also result in insufficient fuel supply, triggering shaking. These faults activate the EPC system warning, indicating intervention by the electronic control unit. I recommend not delaying and driving to a repair shop to read the fault codes with a diagnostic tool, which can accurately identify the source of the problem for timely resolution before minor issues escalate. Regular engine maintenance, such as periodic throttle valve cleaning, can help reduce such risks.
