If you own a Subaru, you may have encountered a situation where the AT oil temp light starts flashing on your dashboard.
This light indicates that your automatic transmission fluid is overheating, which can cause serious damage to your transmission if left unchecked.
In this article, we will explain what the AT oil temp light flashing Subaru means, what causes it, and how to fix it.
We will also answer some of the most common questions that Subaru owners have about this warning light.
By the end of this article, you will have a better understanding of how to prevent and deal with this problem.
What does it mean when the oil temp light flashes On Subaru?
The AT oil temp light flashes on Subaru when the automatic transmission fluid is overheating, which can damage the transmission if not addressed. There are several possible causes for this problem, such as low or wrong transmission fluid, bad transmission fluid temperature sensor, defective wiring, slipping transmission, or bad transmission oil pump.
Important: What Is The Subaru Head Gasket Replacement Cost?
What Causes AT Temp Oil Light To Flash On Subaru?
The AT Temp (Automatic Transmission Temperature) and oil light flashing on a Subaru could indicate a potential issue with the transmission or its fluid temperature. Here are some common reasons why this warning light might flash:
-
Low Transmission Fluid Level
Low transmission fluid can cause the transmission to overheat. Check the transmission fluid level and add more if needed. Ensure you use the correct type of transmission fluid as specified in your Subaru’s owner’s manual.
-
Overheating Transmission
Excessive strain on the transmission, such as towing heavy loads or driving in severe conditions, can cause the transmission to overheat. If you have been putting your Subaru through demanding conditions, allow it to cool down.
-
Faulty Transmission Fluid Temperature Sensor
The transmission fluid temperature sensor may be malfunctioning, leading to incorrect readings. If the sensor is faulty, it might trigger the warning light unnecessarily.
-
Cooling System Issues
Problems with the transmission fluid cooler or the entire cooling system could lead to overheating. Make sure that the cooling system is functioning properly, and that there are no leaks or blockages.
-
Electrical or Wiring Issues
Faulty wiring or electrical issues within the transmission system could lead to incorrect temperature readings and trigger the warning light.
-
Transmission Fluid Contamination
Contaminated or degraded transmission fluid can lead to poor lubrication and cooling, resulting in overheating. Ensure that the transmission fluid is clean and in good condition.
Can I drive My Subaru with the transmission temp light on?
If your Subaru’s transmission temperature light is on or flashing, it’s not advisable to continue driving the vehicle without addressing the issue. The transmission temperature warning indicates that the transmission is operating at a higher temperature than normal, which could lead to damage if not addressed promptly.
Driving with an overheating transmission can result in increased wear and potential long-term damage to the transmission components. It’s crucial to take immediate action to prevent further issues. Here are some steps you can take:
-
Pull Over and Let the Vehicle Cool Down
If you see the transmission temperature warning light, pull over to a safe location, turn off the engine, and let the vehicle cool down. This allows the transmission fluid to cool and helps prevent further overheating.
-
Check the Transmission Fluid Level
Once the transmission has cooled down, check the transmission fluid level. If it’s low, add the appropriate type of transmission fluid as specified in your owner’s manual.
-
Inspect for Leaks
Look for any signs of transmission fluid leaks under the vehicle. Leaks could contribute to low fluid levels and overheating.
How do you check transmission fluid on a Subaru?
Checking the transmission fluid on a Subaru involves a straightforward process. Here’s a general guide, but it’s crucial to consult your specific Subaru model’s owner’s manual for precise instructions and specifications:
-
Park on a Level Surface
Make sure your Subaru is parked on a level surface to get an accurate reading.
-
Start the Engine
Start the engine and let it run for a few minutes to warm up the transmission fluid. This helps to get a more accurate reading.
-
Locate the Transmission Dipstick
Most Subaru vehicles have a transmission dipstick, although some newer models may have a sealed transmission without a dipstick. If your Subaru has a dipstick, it is usually located near the back of the engine compartment.
-
Check the Owner’s Manual
Refer to your Subaru owner’s manual to confirm the location of the transmission dipstick. Additionally, the manual will specify the type of transmission fluid required for your vehicle.
-
Remove and Wipe the Dipstick
Pull out the transmission dipstick, wipe it clean with a lint-free cloth, and reinsert it fully.
-
Remove and Check Again
Pull out the dipstick again and observe the fluid level. Some dipsticks have a “Cold” and “Hot” marking. If the engine is cold, the fluid level should be close to the “Cold” mark; if the engine is hot, it should be close to the “Hot” mark.
-
Inspect the Fluid Color and Smell
Observe the color of the transmission fluid. It should be a clear red or pink color. If the fluid appears dark or has a burnt smell, it may indicate a problem, and you should consider having it checked by a professional.
-
Add Fluid if Needed
If the fluid level is below the recommended level, add the appropriate type of transmission fluid slowly through the dipstick tube. Be cautious not to overfill, as this can also lead to transmission issues.
-
Recheck the Level
After adding fluid, recheck the fluid level to ensure it is within the recommended range.
How do you diagnose Subaru transmission problems?
Diagnosing transmission problems in a Subaru involves a systematic approach, and it’s often best left to experienced mechanics or professionals. However, if you’re looking to identify potential issues or perform initial checks, here are some steps you can take:
-
Check for Warning Lights
Pay attention to any warning lights on the dashboard, such as the Transmission Temperature warning or Check Engine light. These can provide initial clues about the nature of the problem.
-
Fluid Inspection
Check the transmission fluid level and condition. Low fluid levels, dirty or burnt fluid, and leaks can indicate transmission issues. Follow the procedure outlined in the owner’s manual to inspect the transmission fluid.
-
Scan for Error Codes
Use an OBD-II (On-Board Diagnostics) scanner to retrieve any diagnostic trouble codes (DTCs) stored in the vehicle’s computer. These codes can provide insights into specific problems related to the transmission or other components.
-
Test Drive
Take the vehicle for a test drive and pay attention to the transmission’s performance. Look for symptoms such as slipping, delayed or rough shifts, strange noises, or hesitation during acceleration.
-
Check for Leaks
Inspect the ground beneath the vehicle for any signs of transmission fluid leaks. Leaks can contribute to low fluid levels, leading to transmission problems.
-
Listen for Unusual Noises
Listen for any unusual noises, such as whining, clunking, or grinding sounds, especially during gear shifts. Unusual noises can indicate internal transmission issues.
-
Monitor Fluid Color and Smell
Observe the color and smell of the transmission fluid. Healthy transmission fluid is typically red or pink. Dark or burnt-smelling fluid may suggest a problem.
-
Perform a Stall Test
A stall test involves pressing the brake pedal firmly while in Drive to put a load on the transmission. If the engine stalls at a higher RPM than usual, it may indicate a slipping transmission.
-
Check Transmission Mounts
Inspect the transmission mounts for signs of wear or damage. Worn mounts can contribute to transmission issues and vibrations.
Subaru 3 Warning Lights on Brakes Traction Control and AT Oil Temp
If you see warning lights for brakes, traction control, and AT oil temp illuminated on your Subaru’s dashboard, it indicates potential issues that need attention. Here’s what each light may signify:
Brake Warning Light
The brake warning light could indicate various issues, including low brake fluid, worn brake pads, a brake fluid leak, or a problem with the brake system. It’s crucial to check the brake fluid level and inspect the brake components for any signs of wear or damage.
Traction Control System (TCS) Warning Light
The traction control warning light suggests a problem with the vehicle’s traction control system. Issues with wheel speed sensors, ABS (Anti-lock Braking System), or other components related to traction control can trigger this warning. A diagnostic scan may be needed to identify the specific issue.
AT Oil Temp Warning Light
The AT (Automatic Transmission) Oil Temp warning light indicates that the transmission fluid temperature is higher than normal. This could be due to low fluid levels, overheating, or other transmission-related issues. Check the transmission fluid level and condition, and address any overheating concerns promptly.
Considering that three critical warning lights are illuminated simultaneously, it’s advisable to take immediate action:
- Do not ignore these warnings.
- Safely pull over and park the vehicle.
- Check the brake fluid level. If it’s low, address the issue promptly.
- Inspect for any visible leaks under the vehicle, especially around the brake system and transmission.
- If you’re not comfortable diagnosing the issue yourself, seek professional help.
What happens when the transmission temperature light comes on?
When the transmission temperature light comes on, it indicates that the temperature of the transmission fluid has risen to a level that requires attention. Transmission fluid plays a crucial role in lubricating, cooling, and maintaining the proper functioning of the transmission. Here’s what typically happens when the transmission temperature light is illuminated:
Warning Indicator
The transmission temperature light is designed to alert the driver to a potential issue with the transmission fluid temperature. The light may appear as an icon or text indicating “AT Temp” or “Transmission Temp.”
Overheating Transmission Fluid
The transmission fluid in your vehicle helps cool the transmission by carrying away heat generated during operation. When the fluid temperature becomes too high, it can lead to reduced lubrication, decreased efficiency, and potential damage to internal transmission components.
Reduced Performance
An overheating transmission can result in reduced performance, such as delayed or rough shifting, slipping gears, and other abnormal transmission behaviors. Continuing to drive with an overheating transmission can exacerbate these issues.
Protective Measures
Some vehicles may have protective measures in place, such as entering a “limp mode” or reducing engine power to prevent further damage. These measures are designed to allow the driver to address the issue before significant harm occurs.
Risk of Damage
Prolonged operation with an overheating transmission can lead to accelerated wear and potential damage to transmission components, including clutches, bands, and seals. This can result in costly repairs.
If the transmission temperature light comes on, it’s important to take immediate action:
- Pull over to a safe location.
- Turn off the engine.
- Allow the vehicle to cool down.
- Check the transmission fluid level and condition. Add fluid if needed.
- Inspect for any visible leaks.
- If the issue persists, seek professional help for a thorough diagnosis and repair.
Conclusion
We have learned what the AT oil temp light flashing Subaru means, what causes it, and how to fix it.
We have also answered some of the most common questions that Subaru owners have about this warning light.
We hope this article has been informative and helpful for you.
Remember, the AT oil temp light flashing Subaru is not something to ignore, as it can indicate a serious problem with your transmission.
If you see this light, you should pull over and let the transmission cool down, then check the transmission fluid and consult a mechanic.
By doing so, you can prevent further damage and ensure the safety and performance of your Subaru.
