Q: Late upshift when engine is cold

asked by on June 06, 2017

Late upshift from 1st to 2nd gear in the morning when engine is cold, but if engine warmed up for 3 or more minutes before driving, no late upshift, runs normal, even after fluid had been replaced.

My car has 128500 miles.
My car has an automatic transmission.

Many newer automatic transmissions have temperature-sensors in them that, on a stone-cold start, restrict normal shift to only the lower (or non-overdrive gears) until the engine coolant and transmission fluid reach a certain level which in many engines, is around 140 degrees. At that point, engineers generally consider an engine or transmission fully warm for fluid-circulation and engine-stress purposes (this is usually at the lower end of the normal range on an analog temperature-gauge, or when the blue cold-engine light goes off). In some cases, this temperature sensor may fail resulting in delayed shifting or erratic shifting. I would suggest having a professional from YourMechanic come to your location to diagnose and inspect your vehicle.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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

My car is making roaring noises every time I accelerate in any of my 5 gears

The noise is going to be in a bearing in the transmission or one of the wheel hubs. You should have the vehicle lifted and then turn each wheel to see if you can hear noise from the transmission or...

Coolant leaking from engine head gasket

Head gaskets can leak in several ways. It can be an external coolant or oil leak, coolant can leak into the combustion chamber and vise versa, and coolant can leak into the oil. This is not a repair to delay....

My car starts with a boost but when it shuts off and I try to start it again, it will not start. Battery works.

According to what you've described, you may have a bad battery. Low cold cranking amps, low voltage, and/or a bad cell can create the symptom you have described. Your vehicle will continue to run after the boost due to the...

Related articles

Top 10 Best-Selling Cars of 2016
Ford F-series pickup trucks, Toyota Camry, and Honda Civic are some of the best-selling cars of 2016 and all deliver on reliability and efficiency.
A Buyer’s Guide to the 2012 Toyota Tacoma
Available Available in regular cab, access cab, double cab, and Xtracab versions, the 2012 Toyota Tacoma is Toyota’s answer to all of your compact pickup truck needs. In fact, Toyota has outsold both Ford and GM models, and the Tacoma...
2012 Toyota Tundra vs. 2012 Chevrolet Silverado: Which One Should I Buy?
Large work trucks are meant for one thing: work! These vehicles are rough and ready, and can handle nearly anything you throw at them, with the exception of a car pool. While they offer two or four door options, you...