Common Car Problems, Warning Signs & Repair Questions Answered
Everything you need to know about our services, pricing, scheduling, and warranty.
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Expert Answers from St. Marys’s
Trusted Automotive Specialists
If something doesn’t feel right with your vehicle, you’re not alone — and you’re in the right place.
At AAMCO on St. Marys, we’ve spent over 44 years helping drivers diagnose and fix vehicle problems the right way. With 145+ years of combined technician experience, we’ve seen just about everything — from small maintenance issues to complex drivetrain problems.
This page is designed to give you clear, straightforward answers to the most common questions we hear every day — so you can understand what’s going on, what to look for, and when it’s time to take action.
Question Categories
Engine Problems & Questions
Drivetrain & Transmission Questions
Brake System Questions
Electrical System Questions
Suspension Questions
Cooling System Questions
Emissions System Questions
Belts & Hoses Questions
Fluids & Filters Questions
Expert Answers from St. Marys’s Trusted Automotive Specialists
If something doesn’t feel right with your vehicle, you’re not alone — and you’re in the right place.
At AAMCO on St. Marys, we’ve spent over 44 years helping drivers diagnose and fix vehicle problems the right way. With 145+ years of combined technician experience, we’ve seen just about everything — from small maintenance issues to complex drivetrain problems.
This page is designed to give you clear, straightforward answers to the most common questions we hear every day — so you can understand what’s going on, what to look for, and when it’s time to take action.
Engine Problems & Questions
Why is my check engine light on?
Your check engine light can come on for many reasons — from minor sensor issues to more serious engine or emissions problems. In our shop, we commonly see this tied to misfires, fuel system issues, or failing sensors.
Why it matters:
• Can reduce fuel efficiency
• May affect engine performance
• Often leads to bigger issues if ignored
What to do:
Have it properly diagnosed — the code alone doesn’t tell the full story.
Why it matters:
• Can reduce fuel efficiency
• May affect engine performance
• Often leads to bigger issues if ignored
What to do:
Have it properly diagnosed — the code alone doesn’t tell the full story.
Why is my engine running rough or losing power?
This usually points to problems with fuel delivery, ignition components, or airflow into the engine. We often see worn spark plugs, clogged filters, or fuel system issues behind it.
Why it matters:
• Reduces performance and efficiency
• Can lead to further engine damage
What to do:
If your car hesitates, shakes, or feels sluggish, it’s best to have it checked early.
Why it matters:
• Reduces performance and efficiency
• Can lead to further engine damage
What to do:
If your car hesitates, shakes, or feels sluggish, it’s best to have it checked early.
What causes engine overheating?
Overheating is typically caused by cooling system issues like low coolant, leaks, or failing components such as the radiator or water pump.
Why it matters:
• Can cause serious engine damage quickly
• Often starts as a small issue
What to do:
If your temperature gauge rises or you see steam, stop driving and have it inspected.
Why it matters:
• Can cause serious engine damage quickly
• Often starts as a small issue
What to do:
If your temperature gauge rises or you see steam, stop driving and have it inspected.
When should I get my engine checked?
If you notice warning lights, unusual noises, reduced performance, or overheating, it’s time for an inspection.
Drivetrain & Transmission Questions
What causes a transmission to slip or shift hard?
This is often caused by low or worn transmission fluid, internal wear, or component issues. In many cases, we see fluid condition as the starting point.
Why it matters:
• Can lead to major transmission damage
• Repairs get more expensive over time
What to do:
Early diagnosis can prevent more serious repairs.
Why it matters:
• Can lead to major transmission damage
• Repairs get more expensive over time
What to do:
Early diagnosis can prevent more serious repairs.
How do I know if my transmission fluid is bad?
Good fluid should be clean and reddish. If it’s dark, smells burnt, or has debris, it likely needs service.
Can I keep driving with transmission problems?
You may be able to, but it’s risky — these problems tend to get worse quickly.
What we see often:
Small issues turning into full transmission failures when ignored.
What we see often:
Small issues turning into full transmission failures when ignored.
When should I service my transmission?
Most vehicles need service every 30,000–60,000 miles, depending on use and driving conditions.
When should I service my transmission?
Most vehicles need service every 30,000–60,000 miles, depending on use and driving conditions.
Brake System Questions
Why are my brakes making noise?
Squealing usually means worn brake pads, while grinding often means they’re already worn through.
Why it matters:
• Grinding can damage rotors
• Direct safety concern
What to do:
Have any brake noise checked as soon as possible.
Why it matters:
• Grinding can damage rotors
• Direct safety concern
What to do:
Have any brake noise checked as soon as possible.
Why does my car pull when braking?
This may be caused by uneven brake wear, caliper issues, or suspension problems.
What does a soft brake pedal mean?
A soft or spongy pedal often indicates a fluid or pressure issue.
Why it matters:
• Reduces stopping ability
• Serious safety risk
What to do:
Have it inspected immediately.
Why it matters:
• Reduces stopping ability
• Serious safety risk
What to do:
Have it inspected immediately.
When should I have my brakes inspected?
At least once a year, or anytime you notice noise, vibration, or reduced stopping power.
Electrical System Questions
Why won’t my car start?
This is commonly caused by a weak battery, starter issue, or alternator problem.
What we see often:
Batteries nearing the end of their life or poor connections.
What we see often:
Batteries nearing the end of their life or poor connections.
Why are my lights dim or flickering?
This usually points to a charging system issue, often involving the alternator or battery.
Can electrical problems trigger warning lights?
Yes — many warning lights are tied to sensors, wiring, or electrical faults.
Suspension Questions
Why does my car feel bouncy or unstable?
Worn shocks or struts are the most common cause.
Why it matters:
• Affects handling and control
• Can lead to uneven tire wear
Why it matters:
• Affects handling and control
• Can lead to uneven tire wear
Why is my car pulling or drifting?
This may be caused by suspension wear, alignment issues, or tire problems.
When should suspension components be checked?
If you notice poor handling, a rough ride, or uneven tire wear, it’s time for an inspection.
Cooling System Questions
Why is my car overheating?
Most overheating issues are caused by low coolant, leaks, or failing components like the radiator or thermostat.
Why it matters:
• Can quickly lead to engine damage
Why it matters:
• Can quickly lead to engine damage
What are signs of a cooling system problem?
• Rising temperature gauge
• Coolant leaks
• Poor heater performance
• Coolant leaks
• Poor heater performance
How often should coolant be changed?
Typically every 30,000–60,000 miles or based on manufacturer recommendations.
Emissions System Questions
What causes emissions-related check engine lights?
Common causes include oxygen sensors, catalytic converters, or EGR system issues.
Why did my car fail an emissions test?
Usually due to engine performance or exhaust system inefficiencies.
Can emissions problems affect fuel economy?
Yes — they often reduce efficiency and increase fuel consumption.
Belts & Hoses Questions
What happens if a belt breaks?
It can disable key systems like the alternator, water pump, or A/C.
How do I know if a hose is failing?
Look for cracks, leaks, or soft spots.
When should belts and hoses be replaced?
Typically around 4–5 years, depending on wear and conditions.
Fluids & Filters Questions
Why are fluids and filters important?
They keep your vehicle lubricated, clean, and running efficiently.
What happens if fluids aren’t maintained?
It can lead to overheating, wear, and major component failure.
What fluids should be checked regularly?
• Engine oil
• Transmission fluid
• Brake fluid
• Coolant
• Power steering fluid
• Transmission fluid
• Brake fluid
• Coolant
• Power steering fluid
How often should filters be replaced?
Regular replacement helps maintain performance and fuel efficiency.
Get Your Vehicle Checked Before Small Problems Get Worse
If something doesn’t feel right, it’s always better to catch it early.
Call (912) 882-1700 or visit AAMCO on St. Marys today.
We’ll take a look, explain what’s going on, and help you make the right decision.