What Causes the Engine Tachometer to Stop Moving?

3 Answers
VanGemma
07/30/25 1:01am
Reasons why the engine tachometer stops moving: 1. The speedometer in the vehicle's instrument cluster may be malfunctioning; 2. The vehicle's wheel speed sensor may be faulty; 3. The vehicle's mileage sensor may be defective; 4. There may be foreign objects stuck inside the gauge. The engine speed directly affects the number of work cycles per unit time or the effective power output of the engine, meaning the engine's effective power varies with different speeds. The effective power specified on the engine's nameplate and its corresponding speed are referred to as the rated power and rated speed, respectively. The operating condition of the engine at the rated power and rated speed is called the rated condition. The rated power is not the maximum power the engine can produce but the maximum usable limit of effective power determined based on the engine's intended use. For the same engine model, the rated power value may differ depending on its application.
Was this review help?
7
2
Share
DiKimberly
08/15/25 6:30am
The tachometer in my car isn't working, and there could be several possible reasons. The most common issue is a faulty RPM sensor, which is located near the engine and responsible for measuring the RPM signal and sending it to the dashboard. If it malfunctions, the signal gets cut off. Another possibility is a blown fuse—there's usually a dedicated fuse in the fuse box for the tachometer, and it can blow to protect the circuit if the current is too high. Poor wiring connections are also common, such as loose or corroded connectors to the dashboard. Additionally, the dashboard itself might be faulty; in older cars or after a collision, the dashboard chip can fail, causing the tachometer to stop working. Driving without a functioning tachometer is quite annoying, as it affects gear-shifting judgment and could even lead to speeding or engine overload issues. It's best to visit a roadside repair shop for a check-up—don't tamper with the wiring yourself. A professional mechanic can usually diagnose the problem in just five minutes.
Was this review help?
14
5
Share
Expand All
Brielle
10/20/25 4:44am
If you notice the tachometer stuck while driving, don't panic—it's likely a sensor or wiring issue. The RPM sensor is located on the engine side and is prone to failure due to dust or high temperatures. Last time I had my car serviced, the mechanic mentioned that loose dashboard wiring connections are also common, as prolonged vibrations can cause plugs to come loose. Another possibility is a blown fuse—the fuse box usually has labels, and replacing a small fuse should do the trick. A more serious scenario would be a faulty dashboard requiring replacement, but most cases can be fixed with simple repairs. Even if the tachometer isn't moving, the engine will still run, though you might experience rough gear shifts, which could harm the engine. Make it a habit to quickly glance at your dashboard status before driving—it’s a small step that boosts safety. If you need to address the issue, first turn off the engine, check the fuses, and if everything seems fine, seek professional help rather than pushing through and risking delays.
Was this review help?
17
0
Share
Expand All
More Forum Discussions

What are the hidden functions of the 2020 RAV4 remote key?

2020 RAV4 remote key hidden functions are as follows: 1. Vehicle locator: If you often drive in the city, you may frequently park your car in large parking lots or underground parking garages. At such times, if you have a poor sense of direction, you might not find your car. In this case, look at the remote key—there is a button with a horn symbol. Pressing it will trigger the car alarm, with an effective range of over 40 meters. However, use this function cautiously in residential areas or late at night. 2. One-touch window closing: After turning off the engine, if you realize you forgot to close the windows, do you need to go back and insert the key again to close them? Actually, no. Simply press and hold the lock button on the remote key, and the windows will close automatically. Note that this feature may not be available on all models. 3. Automatic trunk opening: When your hands are full, this premium feature comes in handy. Most German cars have this function—press and hold the trunk unlock button or press it twice in quick succession, and the trunk will open automatically. 4. One-touch window opening: On hot summer days, getting into a car with closed windows can feel like stepping into an oven. Press and hold the unlock button to open the windows and cool down the interior. 5. Manual locking: Sometimes, the remote key may become unresponsive, indicating that the battery is running low. If there’s no place nearby to replace the battery, it’s safer to avoid using the electronic lock to prevent the awkward situation of the car being locked with a dead remote key. Instead, use the physical key to manually lock the car doors.
8
0
Share

What Causes a Magotan Battery to Die Without Warning?

Reasons for a Magotan battery dying without warning are as follows: Long-term parking can lead to battery discharge: First, even when the car is idle, the battery will discharge due to its inherent discharge characteristics, meaning it loses charge even when not in use. Second, most modern cars are equipped with anti-theft systems that continue to operate while the vehicle is parked, requiring a certain amount of power. Battery lifespan: Most private cars currently use maintenance-free batteries. Clean the battery's inspection window and observe the color inside: green indicates the battery is normal; black indicates low voltage and insufficient charge, which can be resolved by charging; white indicates the battery has reached the end of its lifespan, and the only solution is to replace it with a new one. Engine damage: If the car's alternator belt is loose or broken, it cannot drive the alternator to work. Alternatively, the alternator contains a rectifier, and a sudden high current can burn out the rectifier's diodes. If the charging circuit is broken or the connections are loose, the car battery will only discharge without charging, leading to a dead battery.
11
2
Share

What does Skyactiv Technology mean?

Skyactiv Technology refers to the optimization of a vehicle's engine, transmission, chassis, body structure, and related software, primarily aimed at enhancing driving pleasure and improving environmental standards. The functions of Skyactiv Technology: It can increase the engine compression ratio, significantly improve transmission efficiency, and utilize lighter and more resilient body suspensions, resulting in substantial fuel consumption reduction. Additionally, it enhances comfort and handling. The advantages of Skyactiv Technology: Improved fuel efficiency, reduced fuel consumption, high compression combustion significantly boosts engine efficiency, with fuel consumption reduction and torque improvement both exceeding 15%.
17
3
Share

What Causes Low Tire Pressure Warning in Cars?

Car displays low tire pressure due to tire damage or slow leaks. The recommended tire pressure under normal conditions is generally between 2.2~2.5. Effects of Underinflation: Underinflation increases tire deformation, causing sidewall cracks and excessive flexing. This leads to overheating, rubber degradation, ply fatigue, and cord breakage. It also increases the tire's contact area, accelerating shoulder wear. Effects of Overinflation: Overinflation causes excessive cord tension and reduced tire elasticity, increasing driving load. Impacts may cause internal cracks or blowouts. It also accelerates tread wear and reduces puncture resistance.
7
1
Share

RX300 Fuel Consumption

RX300 fuel consumption is 10 liters per 100 kilometers. The actual comprehensive fuel consumption is influenced by multiple factors such as load, road conditions, driving habits, weather, wind speed, tire pressure, etc. The actual comprehensive fuel consumption should be based on real driving conditions. Factors affecting fuel consumption: There is a certain relationship between engine displacement and fuel consumption, but higher fuel consumption does not necessarily mean larger displacement. Relatively speaking, the size of a car's engine displacement does not directly correlate proportionally with fuel consumption. Besides engine displacement, factors such as the car's shape, weight, and engine technology are also significant factors affecting fuel consumption. Solutions for high fuel consumption: Correct improper driving habits, maintain steady acceleration, avoid coasting in neutral, reduce vehicle load, perform regular maintenance and inspections, and address any issues immediately when discovered.
2
2
Share

What is the FAW-Volkswagen Magotan?

FAW-Volkswagen Magotan is the Passat model. Its body structure is a 4-door, 5-seater sedan. Taking the 2021 Magotan as an example. Body dimensions: Its body length, width, and height are: 4865mm, 1832mm, 1471mm, with a wheelbase of 2871mm, fuel tank capacity of 66 liters, and trunk capacity of 533 liters. The front suspension is a MacPherson independent suspension, and the rear suspension is a multi-link independent suspension. Powertrain: Equipped with a 1.4L inline 4-cylinder turbocharged engine, producing a maximum horsepower of 150 PS, maximum power of 110 kW, and maximum torque of 250 Nm, paired with a 7-speed dual-clutch transmission.
7
0
Share
Cookie
Cookie Settings
© 2025 Servanan International Pte. Ltd.