Skip the auto shop - Our mechanics make house calls

Q: Wonky cruise control and rough idle on low gear D

asked by on

Just a little background, my car is giving me two codes. P0770 for shift solenoid e and a Low Emissions Efficiency. I drive my car regularly and take it on thousand mile trips every other week. The problem I'm having is that the cruise control is unreliable. Sometimes it will be on for hundreds of miles and other times it will flicker and turn off the whole ride. My mileage seems pretty good and the ride is very smooth. However, at red lights and stops the car vibrates a lot. It can be overwhelming at times. Regardless, the car itself runs really well and it has never stalled on me.

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

Hello. P0770 is the code for a lock up torque converter shift solenoid malfunction. The lock up torque converter shift solenoid controls the fluid pressure of the torque converter, and the rate and timing at which it locks up. This may be the reason behind your intermittent issue. However, similar symptoms can be caused by many things. The cruise control is tied into the engine management system so it may also be possible that a sensor or wire is also causing the issue. Low speed engine vibrations can be caused by many things. I would first try to determine if the vibration is engine, transmission, or chassis-related. A few causes for vibration are engine misfires, worn motor or transmission mounts, or worn suspension components or tires. If you would like have to have this checked, a certified professional from YourMechanic can come to your car’s location to diagnose the rough idle and cruise control problems.

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・Fair and transparent pricing

Get a quote

What others are asking

Q: I have a 1995 Acura Integra GSR and my cluster won't work, the back lights work but my fuel, temp, rpms, and speedometer

Using the wiring diagram from the factory service manual what you want to do is see if the gauges have either a common power source or a common ground. If they do, then basically you track down that circuit to...

Q: Abs lights are on can i take fuse out to take the emissions test and pass?

Hi there: To answer your question in one word - NO, it won't pass. Depending on the state you live, the emissions test will also include a safety inspection that will verify that the electrical system is working correctly. Plus,...

Q: Can I take a 600 mile trip with a blown head gasket?

Hello there. Head gasket failures can cause much larger issues with your 2004 Pontiac Vibe. It is not recommended to drive a vehicle with a faulty head gasket as it can cause the engine to fail if overheated severely. In...

Related articles

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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
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.