Skip the auto shop - Our mechanics make house calls

Q: The first gear in my transmission shifts late

asked by on

As i first go to accelerate my car sounds like a big rig diesel engine and the rpms get to 300rpm before shifting to 2nd moving slowly.

My car has 107000 miles.
My car has an automatic transmission.

A: This may be related to a couple of differen...

This may be related to a couple of different things such as low transmission fluid, a faulty TCM solenoid, or a bad TCM module. As you may know, automatic transmissions use pressurized hydraulic fluid to change gears. Every time a gear change is required, the car's computer activates a transmission solenoid, which directs transmission fluid into the valve body to engage the correct gear. When this is faulty or not working properly, this can cause a delay in gear shifting or in some cases cause the car to not shift at all.

The transmission control module (TCM) helps regulate fuel efficiency and power while storing information about the transmission system in its memory. A faulty transmission control module, may cause the car not to increase its speed even when pressing the gas pedal and may respond poorly when you shift the gear into drive. The transmission control module has various sensors such as vehicle speed sensors, wheel speed sensors, throttle position sensors, turbine speed sensor, and transmission fluid temperature sensors that all direct information to it in order for it to perform its function. Other components controlled by the the TCM include a kick down switch, traction control system, and cruise control module. Any of these may also affect the way the transmission control module performs and controls the transmission and the shifting of your car. I would suggest having a professional mechanic, such as one from YourMechanic, come to your location to properly diagnose your 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・Save up to 30%

Get a quote

What others are asking

Q: P0700 Transmission Control System MIL Request

Hi! A P0700 code stored in the powertrain control module (PCM) indicates that there is a code stored in the transmission control module (TCM) that can be accessed by looking into the TCM with an appropriate scan tool. Having the...

Q: Truck acting like it has no gas.

The fuel pump may be not pumping and would need to be tested to verify it is providing fuel pressure to specifications. The fuel pump and filter should be replaced as a set. I would recommend you get a certified...

Q: Car shuts off sporadically

There are numerous potential causes for your problem. One common issue with Volvos such as yours, is a faulty Electronic Throttle Module (ETM). It sounds like you had it cleaned, but it may need to be completely replaced. Using inputs...

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 Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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...