What Causes the Triangle Exclamation Mark on the Reverse Radar?
4 Answers
Common reasons for the triangle exclamation mark warning light on the reverse radar include: malfunction of the automatic headlights, low battery in the remote key requiring replacement, or a fault in the vehicle's reverse radar system. Other possible causes are as follows: 1. Engine: The engine system's exhaust emission system is substandard, or the engine control unit's memory contains fault codes. 2. Operational faults: Malfunctions in the automatic transmission or dual-clutch transmission operation. Doors not properly closed or insufficient windshield washer fluid may also trigger the warning light. 3. Other electrical components: Issues with other electrical parts may cause multiple indicator lights to illuminate simultaneously.
A few days ago, the reverse radar on my car also displayed a triangular warning sign, so I quickly pulled over to check. Usually, it's because the sensor is covered in mud or snow—just clean it with a wet cloth, but avoid using a high-pressure water gun as it can easily damage it. It could also be due to a loose sensor, aging cracks, or oxidized wiring connections causing malfunctions. I once encountered an issue where it was blocked by ice in winter, but it returned to normal after thawing. If the warning persists after cleaning, consider that the sensor might be internally burnt out or the control unit is faulty. In such cases, take it to a reliable repair shop for inspection—don’t attempt to dismantle it yourself to avoid worsening the problem. A non-functioning reverse system is truly dangerous, especially in narrow alleys or crowded parking lots, as it increases the risk of rear bumper collisions, which can be costly to repair. Remember to routinely check the sensor area when washing your car.
Don't panic when you see the triangular exclamation mark on your reversing radar - it likely indicates a system calibration issue, usually caused by sensor obstruction or damage. Once, I parked near bushes and leaves got stuck between the probes causing false alarms, which resolved after removal. If the probe itself is damaged (e.g., deformed from impact or short-circuited by water ingress), it may trigger continuous warnings. Sometimes it's an electrical issue like blown fuses or worn wiring leakage, especially common in older vehicles. Critical reminder: When faulty, the radar detection function pauses - always visually confirm rear safety or get assistance when reversing to prevent accidents. Develop a monthly habit of cleaning the rear probe area; simple maintenance reduces such issues. If the warning light persists, seek repair immediately - driving safety comes first.
A triangle exclamation mark on the reverse radar directly indicates a fault signal, often due to dirty sensors. I usually check the rear probes first: bend down to see if there's mud, insect remains, or snow covering them? If so, gently brush them off. If they're clean but the error persists, the probe might be cracked or have internal circuit damage, requiring replacement parts. Occasionally, it could be a control module software glitch—try restarting the vehicle system. If you can't fix it yourself, visit a professional shop for a tool-based diagnosis. Don't delay to avoid accidents in blind spots while parking. Maintaining this minor issue won't take much time.
