Skip the auto shop - Our mechanics make house calls

Q: Possible transmission problem

asked by on

Driving on highway for 45min then rpms go to 7000 and will not accelerate, . Stop for a while and was able to limp home. This happened a few times now. Transmission fluid is NOT low but very black in color. Seems to only happen while on express/highway travel, car ok on local roads after extended drive times. Made appointment with transmission repairman, just trying to get second opinion.

My car has 111121 miles.
My car has an automatic transmission.

Hello. The black transmission fluid is a big issue. The fluid is burning due to excessive heat being generated. You will need to change the filter and the fluid. Keep in mind this is completely different then having the entire transmission flushed. When the transmission has heated up to the point the transmission fluid has burned, the gears that are glued together change molecularly. Then with a flush, the heavy detergents then eat away that new bond and tear it apart. The transmission will potentially be useless at that point. Changing just the fluid in the pan and the filter typically does not effect it as extremely. New coolant will also help keep the transmission running cooler. With the damage that has already been done to the transmission, it may only be a limited time that you can keep it going. Have the filter and fluid changed, and keep an eye on it.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: I changed the crankcase vent tube, now the transmission won't shift

If the transmission was shifting fine prior to replacing these parts, then you need to start by double checking your work. Something may have been left loose or may not have been installed correctly. It is possible that the transmission...

Q: The gas cap on my car broke off. (The black knob you use to screw in the gas cap.) The gas cap is stuck securely in the fuel neck. How can I remove it?

Hi there. To remove the gas cap that broke off, get a pair of needle nose pliers and use it to remove the gas cap. Try to locate a part of the gas cap that you can grab with the...

Q: Engine misfire on all cylinders

The actual codes would be needed to steer you in a precise direction. Generally, global misfires are a consequence of a major fuel and/or air induction system issue. Your vehicle has individual spark plug coils so that is not likely...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...