The transmission is one of the most critical, and costly, components in your vehicle. The exact way it achieves this varies from an automatic to a manual car, but whether you drive an auto or a manual, the transmission shuttles power from engine to wheels. One easy maintenance procedure that can prolong its life is being able to check the transmission fluid proper.
Transmission fluid keeps internal parts lubricated, helps to prevent overheating, and enables the transmission to shift smoothly. Normal flow is key to your transmission running efficiently, however, if the fluid becomes low, dirty or contaminated it can contribute to rough changing during driving conditions and become even more damaging with expensive transmission failure or overheating.
This guide covers how to check automatic transmission fluid properly, what indicates that your fluid is low or bad, when you need to change it and the mistakes you can avoid in order not to ruin your transmission.
Why Checking Transmission Fluid Is Important
Checking your transmission fluid is a good habit that keeps your vehicle working properly, avoiding costly repairs.
Prevents Transmission Damage
Adequate fluid levels prevent friction and provide a buffer between the gears to keep wear from getting out of control.
Improves Shifting Performance
Clean transmission fluid enables smooth and consistent gear changes.
Prevents Overheating
What is transmission fluid, it takes away heat produced from usage
Extends Transmission Life
With routine maintenance, your transmission can easily last far longer.
Saves Money
Discovering low or dirty fluid early on can save you big repair bills later.
Signs Your Transmission Fluid Needs Attention
There are various warning signs of low or possibly contaminated transmission fluid.
Delayed Gear Shifts
The car takes its time to shift.
Slipping Gears
The Speed of Transmission Changes on Its Own While Driving
Grinding or Whining Noises
Strange noises can potentially be tattle-tale signs for insufficient lubrication!
Burning Smell
Oftentimes overheated transmission fluid smells burnt.
Transmission Warning Light
On some cars, a warning is displayed on the dashboard when problems are detected in the transmission.
How to Check Transmission Fluid
These steps can change depending on your vehicle, but this is primarily how to check the transmission fluid level.
Step 1: Park on Level Ground
Now, make sure the vehicle is on level ground, and place it in Park (P).
Step 2: Warm Up the Engine
Run the engine until it obtains normal operating temps. Several makers suggest examining the transmission fluid while the motor is running.
Check your owners manual for the specific steps for your vehicle.
Step 3: Find the Transmission Dipstick
Locate the dipstick for the transmission under the hood.
It is typically identified by a red, yellow or orange colored handle and is separate from the engine oil dipstick.
Many newer cars don’t come with a transmission dipstick and instead requires professional service equipment to check the fluid level.
Step 4: Remove and Clean the Dipstick
Remove the dipstick and cleaning it with a lint free rag.
Step 5: Reinsert the Dipstick
Fully dip the oil dipstick in the tube
Remove it again to see how much units are in maintenance.
Step 6: Check the Fluid Level
Fluid should be somewhere between the “Full” and “Low”(or “Hot”) line on the dipstick.
If low, fill with only the correct type of transmission fluid per the vehicle manufacturer.
Avoid overfilling.
Step 7: Examine the Fluid Quality
Healthy transmission fluid should appear:
Bright red or light pink
Clear
Free from debris
A little sweet or neutral in odour
If the fluid is dark brown, black burns or has metal particles in it, a licensed mechanic should take a look here.
Vehicles Without a Transmission Dipstick
Most of the seals on newer vehicles, and many modern sealed transmissions use synthetic blend oils.
These systems usually require:
A vehicle lift
Special tools
Manufacturer-specific procedures
Proper transmission temperature measurements
Check the owner’s manual to see if your vehicle has a sealed transmission or have the fluid checked by a professional technician.
How Often Should You Check Transmission Fluid?
Inspection intervals vary by manufacturer.
General recommendations include:
Every month for older vehicles
At every oil change
Before long road trips
Whenever shifting problems occur
Caution — Always follow your car manufacturers service schedule.
Common Mistakes to Avoid
Checking with a Cold Engine
On some cars it recommended after the engine is really warm up.
Using the Wrong Fluid
Always use the same fluid as the manufacturer specifies.
Overfilling
Excess fluid can lead to foaming and inadequate power transfer.
Ignoring Dirty Fluid
Replacement of contaminated fluid–even if the level is right
Confusing the Dipsticks
I don? t know if this happens all has engine oil dipstick with transmission dipstick.
Tips for Accurate Results
Read the Owner’s Manual
This process is a little different for every vehicle.
Use a Clean Cloth
Keep soil away from the tranmission.
Check on Level Ground
Anhydrous medication over-dosage can impact fluid reading.
Inspect Fluid Color
Transmission color often gives away its condition.
Watch for Leaks
When the fluid level continues to go down, look into the car for transmission injuries.
Real-World Example
Each morning, Michael from Texas discovered he was hesitant when switching his SUV into Drive. He performed the procedure outlined in his owner’s manual to check his transmission fluid, before spending money on an expensive repair.
Turns out he inspected the fluids, and they were just slightly below the recommended line. Almost immediately, the shifting was better after filling with proper manufacturer-approved transmission fluid. Subsequent investigation turned up a small leak in one of the transmission cooler lines, which was repaired before any serious damage occurred.
Michael got a transmission fluid contamination analysis completed early, potentially avoiding a significantly more expensive transmission replacement.
Pros and Cons of Checking Transmission Fluid
Pros
Helps Prevent Major Repairs
Routine checks will catch problems early, before they develop into major issues.
Improves Vehicle Performance
This all relates to fluid levels, which are important for the transmission to shift smoothly.
Extends Transmission Life
Regular maintenance reduces internal wear.
Saves Money
First of all, early detection saves on costly repairs.
Easy for Many Vehicles
At home, many cars allow quick inspections via dipstick.
Cons
Some Vehicles Have Sealed Transmissions
Such are tools and it needs a specific tool with particular procedures.
Incorrect Fluid Can Cause Damage
Hazard of using wrong transmission fluid harming the transmission
Results Can Be Misread
Mistaken checking will give you the wrong readings.
Leaks May Still Require Repairs
Just because you add fluid does not mean you have fixed the leak.
Professional Service May Be Necessary
Note: certain transmission problems require professional diagnosis.
Frequently Asked Questions
Most automatic transmissions need the engine running, but consult your owner’s manual, as this varies by vehicle.
The transmission fluid is usually a deep red color.
Transmission fluid that is healthy is a bright red or light pink color and should be clean.
Originally Answered: Can I drive with low transmission fluid?
Running low on transmission fluid can cause the transmission to fail and should not be driven.
Frequency of Transmission Fluid Inspection
For most vehicles, it’s a good idea to check it during every oil change or at least once monthly.
What happens if transmission fluid is overfilled?
Foaming, overheating, shifting issues and damaged transmission due to overfilling.
Conclusion
Learning how to check transmission fluid is perhaps the simplest way of protecting your vehicle and averting expensive repairs. Regularly verifying fluid level, condition and changing it according to your vehicle manufacturer’s service recommendations goes a long way in assuring smooth shifting and durability of the transmission. Whether you are going on a road trip or performing some maintenance, spend just a few minutes checking the transmission fluid and you will save yourself lots of time and money in the future.