What causes the downhill failure warning light to illuminate?

1 Answers
VonMelanie
07/29/25 7:03pm
The following are the reasons why a car displays the downhill failure warning light: 1. Fuel supply issues: When going downhill, the fuel tank tilts. If the fuel level is low, the fuel may shift forward, causing intermittent fuel supply or insufficient fuel delivery. This triggers the downhill failure warning light. 2. Engine idling: During downhill driving, the wheels may cause the engine to idle. The electronic throttle may automatically cut off fuel supply (a manufacturer-set fuel-saving feature), leading to insufficient internal engine pressure and triggering the warning. In this case, the driver simply needs to press the accelerator slightly to resolve the issue. Note: Connecting professional automotive diagnostic equipment to check fault codes is recommended. Generally, cleaning the throttle body and internal carbon deposits is advised.
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