Skip the auto shop - Our mechanics make house calls

Q: Transmission slips if I shut truck off and restart it will do fine for a few seconds then slip again

asked by on

Transmission slip once you reach about 30 mph if I stop and restart engine transmission will shift fine until about 30 mph and slip again. Transmission fluid level is fine. Warning light for OD off came up then went back off.

My car has 150000 miles.
My car has an automatic transmission.

Hi there, thanks for writing in.

The reason is starts slipping at 30 is this is where it needs to change to second gear or third gear. The problem is most likely the servo piston for the second gear engagement is binding in the transmission housing due to a worn housing. The fix is to overhaul the transmission and have a sleeve put into the housing during the overhaul with an oversize servo kit. The only other fix would be to replace the transmission with a new or rebuilt unit. The reason it works after turning the car off and back on is because it sets a fault for itself and goes into limp mode, and turning it off will erase that fault until its seen again, at which point it will go into limp mode again. You can have this diagnosis verified by a qualified technician, such as one from YourMechanic, who can then provide you with a suggested repair plan.

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!
  • Home
  • Questions
  • Transmission slips if I shut truck off and restart it will do fine for a few seconds then slip again

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: How do I use the CD compression?

The CD compression feature adjusts for the different volume levels on different tracks, so that your CD is at a relatively consistent volume. To turn on this feature, follow these steps: 1. Press the Menu button. 2. Use the Up/Down...

Q: I have a 2011 Ford Fusion that has a tap/knock while idling. Normal for this motor?

Hi there. Typically this is normal for this engine. The design of the valve train causes this engine to make more noise than a lot of engines, but it does not create any issues. The fuel injectors tend to also...

Q: Need to locate body control module 1998 Chevy Blazer

Hi - on your vehicle, the body control module is located up under the dash, to the left of the brake pedal. Unfortunately, this is not a service YourMechanic can offer at this time. Thanks for thinking of us!

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 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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.