Skip the auto shop - Our mechanics make house calls

Q: Diagnostic brought up three codes

asked by on

I had three codes come up when I got my car diagnosed: P0700, P0720, and P0505.

A: Hi there. The codes that you are getting in...

Hi there. The codes that you are getting indicate a couple of different issues. The P0700 and P0720 codes indicate a transmission problem. These indicate a failure in the transmission output speed sensor. I have seen more wiring issues than sensor failures themselves. I would typically check the connection at the sensor first and if it doesn’t looks clean and tight, I would replace the sensor. As for the P0505 code, this indicates an idle problem. This can indicate a vacuum leak in the engine or a dirty throttle body. The vacuum hoses should be checked first and if they are fine, then the throttle body needs to be cleaned and the codes cleared. I would recommend enlisting the help of a certified mechanic, like one from YourMechanic, to inspect the trouble codes and do the repairs necessary to have your vehicle running smoothly again.

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: Passenger headlight duller and full beam does not work

Hi, thanks for writing in. When you went to replace the bulb, did you find any amount of corrosion or signs of burns on the connectors or bulb sockets? Try replacing all of the bulbs at the same time before...

Q: AC not working

The most often cause of the AC not working on a car is low refrigerant. The system is a sealed system, meaning that if the system is low it's because you have a leak. Leaks can come from a simple...

Q: Code P0720 and truck does not shift normally.

Hi there. The code that you are getting is for the output speed sensor of the transmission. I change quite a few of these as they are a common issue. I would have this replaced first and clear the codes....

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
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...