Car Symptoms Guide
Identify car problems by their symptoms. Learn what common warning signs mean and find related OBD-II trouble codes.
Check Engine Light
ModerateThe check engine light (CEL) or malfunction indicator lamp (MIL) illuminates on your dashboard.
Rough Idle
ModerateYour engine shakes, vibrates, or runs unevenly when the vehicle is stopped.
Poor Fuel Economy
LowYour vehicle is using more fuel than normal for the same driving conditions.
Engine Misfires
HighThe engine stumbles, hesitates, or jerks during acceleration.
Car Won't Start
CriticalThe engine cranks but won't turn over, or nothing happens when you turn the key.
Engine Overheating
CriticalThe temperature gauge reads high, steam from the hood, or an overheating warning light appears.
Strange Exhaust Smell
ModerateUnusual odors coming from the exhaust, such as rotten eggs, sweet smell, or burning oil.
Transmission Slipping
HighThe transmission hesitates, slips between gears, or shifts unexpectedly.
Loss of Power
ModerateThe vehicle feels sluggish, has reduced acceleration, or lacks its normal power.
Gas Smell in Cabin
HighYou can smell gasoline inside the vehicle or near the exterior.
Squealing or Grinding Brakes
HighHigh-pitched squealing, grinding, or scraping sounds when applying the brakes.
Steering Wheel Vibration
ModerateThe steering wheel shakes or vibrates at certain speeds or when braking.
Oil Pressure Warning Light
CriticalThe oil pressure warning light illuminates on the dashboard.
Battery/Charging Warning Light
HighThe battery or charging system warning light appears on the dashboard.
White Exhaust Smoke
CriticalThick white smoke or steam coming from the exhaust pipe.