Browse
Property
Property For SaleProperty For Rent
Cars
Used CarsOthers
For Sale
Antiques CollectiblesApparelBaby Kids ItemsBooks， Movies And MusicElectronicsFree StuffGarden OutdoorHealth BeautyHome GoodsHome Improvement SuppliesMusical InstrumentsOffice SuppliesOthersPet SuppliesSporting GoodsTicketToys GamesTransportation
Services
BusinessCraftsDesign And WebEventsHome ImprovementLegalLessonsPersonalPetsPhotographyRepair And Technical SupportWellnessWriting， Translation， And TranscriptionVehicle rentalsOthers
Jobs
AccountingAdministration & Office SupportAdvertising， Arts & MediaBanking & Financial ServicesCall Center & Customer ServiceCEO & General ManagementCommunity Services & DevelopmentConstructionConsulting & StrategyDesign & ArchitectureEducation & TrainingEngineeringFarming， Animals & ConservationGovernment & DefenseHealthcare & MedicalHospitality & TourismHuman Resources & RecruitmentInformation & Communication TechnologyInsuranceLegalManufacturing， Transport & LogisticsMarketing & CommunicationsMining， Resources & EnergyReal Estate & PropertyRetail & Consumer ProductsSalesScience & TechnologySelf EmploymentSport & RecreationTrades & ServicesOther
Community
Activities & GroupsArtists & MusiciansClasses & LessonsEventsFriendship & NetworkingLost & FoundRideshareSports TeamsVolunteersTravel & Travel PartnersSkills & Language SwapOther
···
Log in / Register

What causes the loud 'bang' sound when reversing in an automatic transmission car?

4 Answers
AllieFitz
07/29/25 8:11pm
Hearing abnormal noises when reversing in an automatic transmission car is caused by gear shift shock. Here are possible reasons and solutions for gear shift shock: 1. Faulty clutch plates inside the transmission: Solution: If the transmission fluid smells burnt, it indicates the clutch plates inside the transmission are burned out. The transmission needs repair. 2. Transmission system malfunction: Solution: If the transmission system shows error codes. Repair according to the error codes (be sure to go to a professional auto repair shop for repairs). 3. Faulty oil circuit control board: Solution: If the internal valve body of the oil circuit control board is burned out. Go to a repair shop for repairs.
Was this review help?
12
1
Share
IrisLee
08/14/25 4:28pm
I've been driving for over a decade and have heard that 'thud' sound while reversing several times. Most commonly, it's the tire rolling over a raised manhole cover or small step – the noise is loud but the car's fine. Another time, the sound came from the undercarriage; upon inspection, I found the exhaust pipe mounting bracket had loosened, causing a dull metallic clunk when hitting bumps. What's more concerning is when an unsecured toolbox in the trunk slides and hits the back seat – that noise resembles being rear-ended. My advice: after parking, immediately step out to check the tires and undercarriage for scratches, then inspect trunk items. If the sound persists or you feel jerking, it's likely an internal gear meshing issue in the transmission. Head straight to the shop to check hydraulic fluid and clutch plates – don't wait for minor issues to become major repairs.
Was this review help?
15
1
Share
Expand All
Katherine
10/16/25 2:57am
The most dreaded sound when reversing is transmission issues. In automatic transmissions, the hydraulic system engages the gears during reverse, and if oil pressure fluctuates or clutch plates are worn, it can produce metallic clanging noises. My neighbor’s car had this problem last time—contaminated transmission fluid caused harsh shifting. Additionally, loose underbody shield bolts or worn/damaged suspension bushings can create unusual noises when reversing or turning. First, identify the sound’s origin: front-end noises usually indicate front suspension issues, while rear-end sounds often point to loose exhaust pipes or spare tire mounts. Prioritize checking transmission fluid color and chassis bolt torque to prevent more severe drivetrain failures.
Was this review help?
9
5
Share
Expand All
MacPaul
11/29/25 3:45am
Last time I heard a 'bang' while reversing, it was a tire issue. When reversing quickly, I ran over a hidden low curb, causing a small bulge on the tire sidewall. Another time, after rain, water splashed up and hit the underbody guard like a drum. It's advisable to observe ground obstacles more carefully before reversing, especially on gravel roads. Open the window to listen for the direction of the sound; noises from the rear are often due to unsecured trunk items or loose reverse radar sensors. After getting out, check the tire sidewalls and rims for impact marks, and press on the four corners of the car to see if there are any unusual noises from the suspension. If the tire has a bulge or deformation, it must be replaced immediately.
Was this review help?
9
4
Share
Expand All
More Forum Discussions

What does it mean to downshift by two gears?

Downshifting by two gears refers to shifting directly from fifth gear to second gear, but in this case, it fails to successfully decelerate the vehicle and may instead cause the transmission gears to break. Therefore, when performing emergency downshifting, it is necessary to downshift step by step to minimize damage to the vehicle. The relevant details are as follows: Based on road conditions and vehicle speed, control the steering wheel properly, quickly press the accelerator pedal, and shift from a higher gear to a lower gear. Simultaneously, engage the handbrake, but avoid pulling it too tightly or holding it continuously, as this may cause the brake disc to "lock up," damaging the transmission components and losing braking capability. Also, do not pull it too loosely, as this may lead to excessive wear and overheating of the brake disc, resulting in loss of braking function. During the moment of upshifting, the engine speed drops immediately, but the vehicle speed remains unchanged. At the same time, due to the reduced transmission ratio, the torque output from the engine to the wheels also decreases. After completing the upshift, the vehicle accelerates by pressing the accelerator pedal, but due to the reduced torque output, the acceleration is relatively slow. Conversely, during the moment of downshifting, the engine speed rises immediately, but the vehicle speed remains unchanged. Meanwhile, due to the increased transmission ratio, the torque output from the engine to the wheels also increases.
15
4
Share

What is the function of tire pressure monitoring?

The function of tire pressure monitoring is to automatically and real-time monitor the tire pressure during vehicle driving, and to alert for tire leakage and low pressure to ensure driving safety. There are three commonly used tire pressure monitoring methods: Direct tire pressure monitoring: The direct tire pressure monitoring device uses pressure sensors installed in each tire to directly measure the tire pressure. It uses a wireless transmitter to send the pressure information from inside the tire to a central receiver module, which then displays the tire pressure data for each tire. When the tire pressure is too low or there is a leak, the system will automatically alert. Indirect tire pressure monitoring: When the pressure of a tire decreases, the weight of the vehicle will cause the rolling radius of that wheel to become smaller, resulting in a faster rotation speed compared to other wheels. By comparing the speed differences between the tires, the purpose of monitoring tire pressure is achieved. The indirect tire pressure alert system actually relies on calculating the rolling radius of the tires to monitor the pressure. Introduction to the Tire Pressure Monitoring System (TPMS): It combines the advantages of the above two systems, equipping direct sensors in two diagonally opposite tires and a 4-wheel indirect system. Compared to using only a direct system, this composite system can reduce costs and overcome the defect of the indirect system not being able to detect when multiple tires simultaneously have low pressure. However, it still cannot provide real-time data of the actual pressure in all four tires like the direct system.
20
4
Share

What Causes the Engine Warning Light to Illuminate in the T-ROC?

T-ROC engine warning light may illuminate due to the following 7 main reasons: Sensor malfunction: Sensors such as coolant temperature, crankshaft position, air flow, intake temperature, and oxygen sensors, when damaged, poorly connected, or with interrupted signals, prevent the car's ECU from accurately obtaining engine data, triggering the warning light. Fuel quality issues: Failure to use the fuel and engine oil as specified by the manufacturer may cause engine wear, leading to the warning light. Poor combustion of the air-fuel mixture: This can lead to engine carbon deposits or knocking. Detected by the oxygen sensor and reported to the ECU, the warning light will illuminate. Causes include faulty spark plugs, ignition coils, fuel pump, or clogged fuel lines. Turbocharging issues: Problems with the intake turbocharging pipeline or turbocharger can trigger the warning light. Turbocharger damage is most common, accompanied by symptoms like oil leaks, high oil consumption, reduced power, metallic noises, or blue/black smoke from the exhaust. Intake issues: Blocked engine pipes due to intake problems can cause the warning light to illuminate, especially if the air filter is dirty and not cleaned regularly. Exhaust issues: Faults in the exhaust system, such as rear oxygen sensor, catalytic converter, exhaust camshaft, or bearing failures, can trigger the warning light. The catalytic converter is most commonly affected by leaded gasoline, certain lubricant additives, physical damage, or fuel system faults. Anti-theft system malfunction: If the car's electronic anti-theft system fails or the anti-theft controller is incompatible with the engine ECU, the engine may not operate correctly, and the warning light will illuminate. Steps to address the engine warning light: First, check if the engine is running normally, looking for signs like shaking or black smoke. Avoid restarting if these symptoms are present, especially if the light is red. If the engine can start, turn it off for 5-10 minutes, then without pressing the brake, press the start button or turn the key halfway to the 'on' position. The car will perform a self-check; observe if the warning light turns off after 5-10 seconds. If the light remains on, visit a service station promptly. Technicians can use a diagnostic tool to read fault codes and perform targeted repairs.
12
3
Share

What are the long-term effects after repairing an engine that has taken in water?

After repairing an engine that has taken in water, the long-term effects are as follows: 1. Water immersion: If the vehicle was only immersed in water and then towed to a repair shop (without starting the engine), this generally does not cause irreversible damage to the engine. The main task is to clean the accumulated water inside the engine, but the extent of cleaning depends on the situation. More often, the intake pipe and intake manifold are removed, and compressed air is used to dry the water inside. In this case, there are usually no significant aftereffects. If you are concerned about aftereffects, you can replace all necessary parts. 2. A small amount of water entering the cylinders: In many cases, the owner is unaware that the engine has taken in water, and coincidentally, the amount of water is small (enough to allow the engine to start). If the owner chooses to continue driving at this point, the final consequence could be the piston seizing in the cylinder, with the connecting rod bending or breaking due to the immense pressure. A more severe scenario is the broken connecting rod piercing the cylinder block directly. At this stage, the engine may require major repairs or even be scrapped, and it might leave aftereffects such as shaking, reduced power, and frequent malfunctions. 3. A large amount of water entering the engine cylinders: This might seem the most severe, as the common belief is that more water causes more damage to the engine. However, in reality, when the cylinders are filled with a large amount of water, the engine crankshaft cannot rotate at all. Since water is incompressible, the piston has almost no room to move upward. At this point, even if the ignition switch is turned on, the starter motor cannot rotate, meaning no further damage is caused to the engine. Nevertheless, the engine will likely need major repairs at this stage.
13
1
Share

Is there a big difference between 245 and 255 tires?

There is a significant difference between 245 and 255 tires, mainly in the following aspects: 1. 245/60r18: The tire section width is 245mm; the tire aspect ratio is 0.6, commonly known as a 60 series tire; R indicates that the tire is a radial tire; the tire rim diameter is 18 inches. 2. 255/50r20: The tire section width is 255mm; the tire aspect ratio is 0.5, commonly known as a 50 series tire; R indicates that the tire is a radial tire; the tire rim diameter is 20 inches.
17
3
Share

What Items Need to Be Maintained in Car Maintenance?

Car maintenance items include: replacement of engine oil and oil filter, air filter, fuel filter, transmission fluid, spark plugs, as well as inspection of the battery, motor, and electrical system. Car maintenance refers to the preventive work of regularly inspecting, cleaning, supplying, lubricating, adjusting, or replacing certain parts of the car. The purpose of car maintenance is to eliminate hidden dangers, prevent failures, and extend the service life. Modern car maintenance mainly includes the maintenance of the engine system, transmission system, air conditioning system, cooling system, fuel system, power steering system, and more.
5
5
Share
Trending Ranking
What is the place where cars are sold called?
What brand of transmission oil does the Haval H6 use?
Can I directly transfer ownership when selling to a used car dealership?
4
Can a car be sold with the green book not under the owner's name?
5
Can You Back Out After Signing a Contract to Sell a Used Car?
6
What is the difference between factory paint and spray paint?
7
How many kilometers can be driven in one hour on the highway?
8
How Long Can the Vehicle Quota Be Retained After Selling a Car?
9
What Causes the Engine Compartment to Make a Ticking Sound Every Few Seconds at Idle?
10
How Long Can You Sleep in a Closed Car?
More Forum Discussions

Does running through an intersection when the light turns red halfway through count as running a red light?

16
2
4

How long does it take for the engine coolant temperature to reach 90°C in winter?

7
2
4

Can Flood-Damaged Vehicles Be Covered by Insurance?

11
1
4

Should You Sell or Continue Using a Vehicle After Major Engine Overhaul Due to Water Damage?

17
1
4
About Us
Terms of Use
Privacy Policy
Help
Contact Us
FAQ
Cookie
Cookie Policy
Cookie Settings
© 2025 Servanan International Pte. Ltd.