Skip the auto shop - Our mechanics make house calls

Q: Automatic transmission programming problem

asked by on

I'm having some issues with the automatic transmission in my car. While I'm driving at the speed of 30 mph, the car is showing that it is in fifth gear. Similarly, when I drive at only 45 mph, it shows sixth gear. Another weird thing is that when I'm accelerating fast, it would show downshifting gears. So, for instance, then it would shift from fifth gear to second gear. It is confusing how this transmission works and how it is possible to downshift in order to accelerate while going at the speed over 65 mph. I was told this a programming issue. What do you think? Is there any way to fix this or should I just drive this way?

A: While I agree that this is all probably bui...

While I agree that this is all probably built into the programming of the transmission computer, after looking at the Mazda service information, I see no TSB’s that states Mazda has any updates available in transmission programming to address any of these concerns. However, there is a TSB that does correct torque limitations that will correct issues with steep hillclimbs. This would affect the downshift logic, maybe under heavy acceleration you might be triggering an over torque protection feature and that is why the the transmission downshifts from 5th to 2nd. But this is purely speculation. You could take it to the dealer and get the latest software calibrations installed along with a fault survey of the transmission control unit to be sure that you do not damage the transmission in case there is a problem with the current software installed. I would have the shifting and acceleration issue checked sooner than later to avoid any major damage from happening to the transmission.

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: Jeep wont start

A common fault is a bad connection to the starter solenoid. The small wire - yellow I believe. Corrosion can happen in the connector. Try cleaning it, or cutting it off, and replacing it with a new one. If...

Q: Engine light came on. Car drives slow and stopped going in reverse. Could it be a knock sensor or is it the transmission?

Hi there. If the vehicle is driving slow and will not go into reverse, then the computer could have the engine in limp mode due to either the transmission not shifting into reverse. If there was no signs of gear...

Q: While driving on highway, hear a loud noise then I stop and.look seem like nothing wrong.

Hello. If the vehicle will not go back into drive then you may have an internal transmission failure or it may be a broken shifter cable. I have seen these cables break frequently. I would need to know a little...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
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...