Q: Not getting smooth shifts anymore but the transmission works

asked by on November 05, 2015

The automatic transmission in my 2007 Jeep Grand Cherokee started acting up around 75,000 miles into owning it. Now I would understand if it started shifting rougher or some other normal transmission problem, but this transmission will downshift at highway speed, making the whole thing slow down. It will refuse to shift out of first gear. I turn it off and back on again and that fixes it sometimes. I'm guessing it’s a computer issue, my laptop does the same thing. Expected better out of a Jeep! How can I diagnose this problem?

Sounds like you may have a problem with corrosion in the transmission control module, shift module, or in some of the engine sensors.

Reading the engine codes would lead to a more specific diagnosis, but checking for corrosion on any of the electrical connections within the transmission and cleaning out connectors may resolve the issue.

I suggest engaging a certified mechanic, such as one from YourMechanic, to scan your computer system and check specific codes for a thorough diagnosis and repair.

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

What others are asking

Problem starting car and dies while driving

This sounds like it could be a faulty crankshaft sensor or a camshaft sensor. These engines had problems with both. The hard start and the backfire may be the camshaft sensor. The stall and no start condition may be from...

Intake maifold runner control is stuck open

Hello, thanks for writing in about your 2001 Mazda Miata. Due to this trouble code, the intake manifold runner control will need to be replaced. If this is not done you can cause serious damage to your car. If you...

Safe to drive if thermostat needle fluctuates but car doesn't run hot

Hi There, It sounds like your thermostat in your cooling system is sticking causing the temperature gauge to fluctuate as you have indicated. The thermostat regulates the flow of the coolant in your car's engine and controls when the coolant...

I'm wondering if it'll be a good idea to take out the whole ac compresser from my car?

The check engine light is supposed to come on if the controller detects a problem with the car that would effect the vehicle emissions. So it warns you of bad sensors, air leaks, misfires, overheating, and that sort of thing....

Do the rotors needs to be replaced with the brake pads?

All Mercedes manuals recommend replacing the brake pads and rotors in sets. The rotors cannot be resurfaced due to material used in the rotors. The rotors are made of softer materials than most vehicles and wear more and should be...

Dodge Ram 1500 won't go over 20 miles it's a 2007

Hi Lisa. Without knowing specifics about what may have occurred prior to your truck only going 20 mph, it's hard to give you accurate advice. It's possible that your truck may have a transmission issue, which typically triggers a limp...

My car has an engine check light orange in colour

You will need to have the Check Engine Light diagnosed by having the computer scanned and any codes diagnosed. Be aware that O2 sensor codes may not be an O2 sensor failure but an engine running lean or too rich....

My car vibrates when it's in gear, even at idle. There is less vibration in park or neutral.

Hi there. This type of vibration in my history has usually been the result of a weak, split, or broken engine mount or metal fatigue in the body. A visual inspection of the engine mounts can be a quick determination...

Engine races or revs while driving.

Hi There, This may be a sign of low transmission fluid or a faulty transmission control solenoid. As you’re going down the road, the car’s computer analyzes data being sent by vehicle speed sensors and engine speed sensors. Based on...

Related articles

P2568 OBD-II Trouble Code: Direct O-Zone Reduction Catalyst Temperature Sensor Circuit Range/Performance
P2568 P2568 code definition Direct O-zone Reduction Catalyst Temperature Sensor Circuit Range/Performance What the P2568 code means P2568 is an OBD-II generic code that the engine control module (ECM) has detected the engine o-zone reduction catalyst temperature sensor to be...
P0798 OBD-II Trouble Code: Pressure Control Solenoid “C” Electrical
P0798 means there is a problem with the electronic pressure control solenoid or solenoid circuit due to low or dirty transmission fluid.
P0435 OBD-II Trouble Code: Catalyst Temperature Sensor Bank 2
P0435 code means the oxygen sensors readings falls outside of the expected parameters due to fuel in the exhaust system, or injector malfunction.