What does it mean when the STOP light is on in a large vehicle?

1 Answers
OValentina
07/30/25 9:29am
When a red or yellow "STOP" indicator light appears on the dashboard of a large truck, it indicates a very serious mechanical fault (usually an engine electronic control system failure). The vehicle must be stopped immediately to avoid permanent damage to key components (engine, transmission) or potential traffic safety accidents. Below are the possible causes of the fault: 1. Engine electrical faults: These include damage to sensors such as the air flow meter, throttle idle motor, intake pressure sensor, oxygen sensor, etc. They may also involve control units or actuators like the engine control unit (ECU), ignition control unit, fuel pump, or camshaft adjustment solenoid valve. 2. Engine mechanical faults: These can arise from changes in fuel quality, such as using fuel with excessive additives, or from carbon buildup covering the intake tract, throttle, or spark plugs. Additionally, intake tract air leaks below standard values can also trigger corresponding faults.
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