What causes vehicle shaking and the EPC light to come on?

1 Answers
JaxsonLynn
07/30/25 8:48am
Vehicle shaking and the EPC light coming on can be caused by the following reasons: 1. Electronic control system malfunction: A constantly lit EPC warning light indicates a fault in the engine management system or electronic control, often accompanied by unstable idling or cold start engine shaking, usually caused by poor fuel quality or dirty operating environment. 2. Electronic control system failure: The EPC indicator lights up during ignition system function check. If it illuminates while driving, it signifies a malfunction in the engine power electronic control system, requiring immediate engine inspection. 3. Other causes: There are two possibilities when the EPC light comes on - either the throttle body is dirty and needs cleaning, or the brake lights aren't functioning, requiring bulb replacement or inspection of the brake switch and wiring.
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