Q: My car shakes a lot at idle.

asked by on February 22, 2017

There is a check engine light that comes and goes. P0456. Only occurs at idle, vehicle seems fine otherwise. I just bought it 10k miles ago. I'm thinking it might need an engine tune up. Dealer wants 126 to find the issue, and I don't want to pay that if it's just a hose that needs replacing.

My car has 73000 miles.
My car has an automatic transmission.

Diagnostic Trouble Code P0456 indicates a small leak in the EVAP system and such will not account for the rough idle. Check your gas cap as a faulty cap will frequently cause that code to set. If you replace the cap, use an OEM (dealer supplied) cap only. Rough running at idle can be caused by faults in the air induction system as well as the ignition and fuel systems. Faulty motor mounts can also cause the engine to vibrate. If you want the running condition of the engine evaluated by a certified Mechanic, dispatched by YourMechanic right to your location, please request a rough idle diagnostic. If you have further questions or concerns, do not hesitate to re-contact YourMechanic as we are always here to help you.

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

Hello my car at first my car was making a scraping sound when i drive and then it started making knocking sound on my left wheel

As noises, scraping and knocking often have different causes so it is not clear if there is just one issue or multiple issues with your car. In general, if these noises are coming from the chassis or suspension, the possibilities...

Headlights won't turn on and tail lights and blinker lights always stay on

If everything was working fine before switching columns then you know the problem is in the wiring. You stated the wire connectors were different and that you hooked up what you could. The only way to get this to work...

dont know if my tranny is shifting into overdrive and the torch converter not locking in or the orther way around

Gear selection, and coincident operating parameters (e.g., line pressure; solenoid position), on your transmission are easiest to see with a manufacturer scan tool. If and once it is determined that there is no lock-up, or no overdrive gear, the cause...

Related articles

2012 Chevrolet Silverado vs. 2012 Dodge Ram: Which One Should I Buy?
When you are looking for a way to get a load of mulch or gravel, or need to haul a large trailer or boat behind your vehicle, chances are you are looking for a truck. Trucks are not meant to...
Politics and Personal Driving Preferences: Do Republicans and Democrats Drive Different Cars?
Dodge Rams are the most popular car in Republican states; the Toyota Prius is the most popular in Democratic areas (as are hybrids and foreign cars).
The Best Used Cars to Buy If You’re a Massage Therapist
If If you're a massage therapist, one of the cornerstones of your business has to be that you don’t keep your clients waiting. That means you need a vehicle that’s reliable. You also will have to move your gear, including...