What people keep running into with car trouble
Complaints tagged car trouble, each raised by more than one person. One-off posts are not included.
39 recurring problems · 829 people · 10 forums we read
Raised more than once
Most people first.
- 10Why does my car battery warning light flicker on and off?An intermittent battery light that changes with engine revs usually indicates a failing alternator or a loose drive belt failing to supply proper voltage at lower speeds. This prevents the charging system from maintaining a full battery charge while idling or driving under four thousand RPMs.
- 10Why does a new engine part break right after expensive dealership repairs?Major engine repairs can leave underlying issues undetected, leading to secondary component failures shortly after pickup. Dealerships often treat these breakdowns as separate problems and quote additional thousands, leaving car owners stuck paying for cascading failures or fighting to prove shop negligence.
- 9Car shakes at high speeds even with good tires and alignmentHigh-speed vehicle vibration that persists despite balanced tires and proper alignment is often caused by warped brake rotors, which create a pulsing sensation felt in the seat rather than the steering wheel. This leaves drivers guessing whether the issue stems from rear brakes or other mechanical components like the drivetrain. Without identifying the true root cause, DIYers risk wasting time and money replacing parts prematurely.
- 8What does a ticking engine noise and flashing check engine light mean?A ticking noise that speeds up during acceleration, combined with a flashing check-engine light, points to an active mechanical misfire or severe internal fault. Because this happens right after major work like a camshaft replacement, drivers cannot safely tell if the vehicle is drivable or on the verge of total engine failure.
- 7Why does my truck stall and die when shifting into reverse?Vehicles can stall immediately upon shifting into reverse or drive, accompanied by severe jerking and high idling speeds. This persistent issue can happen even with a brand new transmission installed, preventing the vehicle from operating normally when changing gears.
- 7Found damage on a used car after buying it from a dealershipDealerships sometimes mask hidden vehicle flaws like welded alloy wheels using tire shine or other cosmetic tricks so buyers cannot spot them during a purchase. Discovering this structural damage later leaves buyers stuck with unsafe parts and breaks the trust expected when buying from an official dealer.
- 7Engine still squeaking after replacing water pump and tensionerNew cooling and belt components often fail to resolve an idle squeak because residual load issues — such as a failing AC compressor or auxiliary pulley alignment — keep putting uneven tension on the belt system. This leaves drivers dealing with persistent noises and vibrations that defy straightforward part-swapping fixes.
- 6Why is my car showing random dashboard warning lights?Intermittent dashboard warnings can appear even when components like brake pads have plenty of life remaining, or trigger brief gearbox errors while driving normally. These phantom alerts are often caused by glitchy sensors, loose wiring connections, or minor software hiccups rather than actual mechanical failure, leaving drivers unsure whether it is safe to keep driving.
- 5Why does my car go into limp mode after warming up?Oil on the ECM plugs can cause a vehicle to repeatedly drop into limp mode a few minutes after warming up while throwing code P1125. This restricts speed to around four miles per hour, leaving drivers uncertain if it is safe to drive to a garage without risking engine damage.
- 5Can a bad catalytic converter cause head gasket failure?Running a vehicle with a bad catalytic converter over thousands of miles leaves drivers questioning whether the added engine stress triggers head gasket failure or if the issue is simply age-related. Drivers also encounter related hardware problems, such as finding iron particles accumulating in the intercooler.
- 5Engine stalling after replacing mass air flow sensorReplacing a mass air flow sensor can sometimes leave a vehicle shaking, idling weakly, or stalling at red lights. Even with a new OEM sensor or after reverting to the old part, secondary trouble codes like a P0106 MAP sensor issue can persist, preventing the engine from running smoothly.
- 5Why does my automatic transmission get stuck in low gear when accelerating?Automatic transmissions can get stuck in a lower gear and refuse to upshift during acceleration until you lift your foot off the gas pedal. This forces the car to rev high without shifting, preventing normal acceleration and smooth driving.
- 4Why is my car hard to start after getting gas?Filling up the gas tank floods the engine with excess fuel, creating an overly rich condition that causes the car to bog down or refuse to start normally. Drivers have to resort to holding down the gas pedal while cranking to clear the extra fuel before the vehicle will finally fire up and run smoothly.
- 3Car shaking and burning smell while drivingA vehicle shaking and emitting a burning or gas smell at highway speeds points to severe mechanical or fuel system malfunctions. Ignoring these symptoms prevents safe operation and can lead to sudden engine failure or fire hazards.
- 3Why does my car die right after a jump start?When a jump-started car engine dies immediately upon idling or letting off the gas, it fails to stay running on its own power. This leaves drivers unable to drive the vehicle anywhere since the engine bogs down and cuts out the moment assistance is removed.
- 2Why does my car misfire when it rains?Moisture gets into components like the ignition system, distributor cap, battery, and coil during wet weather, causing the car to struggle to start or misfire badly when accelerated. Drivers are left stranded with a vehicle that won't turn over or hesitates heavily until everything dries out.
- 2How to test a car ignition switch with a multimeterA faulty ignition switch can prevent your car from starting or failing to shut off properly. This stops electrical signals from reaching components like the starter relay, leaving you stranded or unable to kill the engine.
- 2How to tell if low compression is bad piston ringsLow cylinder compression and blowby are often caused by stuck or worn piston rings, but diagnosing them at home requires sorting through symptoms like persistent misfires when other parts have already been replaced. Without funds for a professional mechanic, trying to pinpoint the mechanical failure yourself leaves you stuck guessing whether the rings are simply gunked up or require a full teardown.
- 2Car died after driving through a puddle, is it hydrolocked?When a vehicle dies and warning lights come on shortly after driving through a massive puddle, it means water got inside. Even though the electrical lights still work, turning the key does nothing, leaving drivers stranded and terrified that their engine is permanently hydrolocked.
Comes up alongside
Topics that keep appearing on the same problems — not topics with similar names.