Skip the auto shop - Our mechanics make house calls

Q: problems with changing gears

asked by on

my transmission will sometime not shift gears and my check engine light come on it takes along time to shift gears my rpm goes up to over 30 and stop put it in neutral and move the gear stick back in drive then it will change but sometimes it don't do it it shifts the way it suppose to

My car has 164000 miles.
My car has an automatic transmission.

Hi there. The transmission is loosing power to the sensors and solenoids inside the transmission case. Go under the vehicle with the wheels chocked and check the transmission harness. Look for any debris, oil, moisture, broken or bent pins. If there is nothing wrong with the harness, then with the ignition switch on and the engine off, check for power at the harness with a digital volt ohm meter (DVOM). Also check for a ground in the harness with the DVOM. If there is power and ground, then the harness inside the transmission may be broken and is shorting out and needs replaced. Plus, check the circuit for the downshift solenoid to the transmission.

If the downshift solenoid is not functional, then the transmission may also lock out the shifting. If there is no power or ground, then turn the key off and check the battery terminals and the fuse box for any loose wire and blown fuses. If all wires and fuses are okay, then check for power and ground at the computer. If there is no power to the computer, then there is a broken wire between the computer and the fuse box. If there is power, check for power coming out of the computer. If there is power coming out of the computer then change the harness to the transmission. If there is no power coming out of the computer, then the computer has failed and need replaced. If you need further assistance diagnosing your vehicle, then seek out a professional, such as one from YourMechanic, to help you with your vehicle.

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

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: Whining noise near motor with acceleration and deceleration of RPM, power steering fluid level is normal.

Hi there. Loved the sound description! In most cases, this type of noise is caused by a loose serpentine belt or worn out pulley on one of the accessories it powers. You might want to have a professional mechanic come...

Q: okay so my opel corsa is not selecting 4th gear and aparenlety its not my linkagesthe mechanic says its my braches ....confuse?

Hello - there may be a problem with translation on this one - "branches"? I am wondering if the mechanic meant to say that the shift fork, which is internal to the transmission, is either worn or bent in such...

Q: Head gasket failure

There are several indicators possible. If the oil under the oil filler cap, or the oil on the dipstick, has a milkshake-like appearance, this would indicate coolant leaking into the oil. A milky substance under the radiator cap would indicate...

Related articles

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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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...