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What is the SVS light fault issue in trucks?

1 Answers

JeremiahRose

07/28/25 6:31pm

SVS fault indicator light is: a warning light that appears when the ECU (Engine Control Unit) or TCU (Transmission Control Unit) of an electronically fuel-injected vehicle detects an issue with the engine or automatic transmission. All electronically fuel-injected vehicles are equipped with an SVS fault indicator light. In manual transmission vehicles, it serves as the engine fault indicator, while in automatic transmission vehicles, it indicates both engine and automatic transmission faults. Below are relevant details: 1. SVS, which stands for Service-Vehicle-Soon in English, translates to "Repair the vehicle as soon as possible." The SVS light is a standardized indicator in the automotive industry, responsible for alerting users to abnormalities in the powertrain system and prompting them to have the vehicle serviced. 2. When the powertrain system's self-diagnosis detects an abnormality, it uses the SVS light to alert the user to service the vehicle. The SVS light warning may originate from the engine, transmission, or gearshift control mechanism. If the SVS light flashes, it indicates a current fault in the powertrain system, requiring immediate service. 3. If the SVS light remains steadily lit, it indicates a historical fault in the powertrain system. In most cases, the system will automatically repair historical faults, and the SVS light will turn off.

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