Skip the auto shop - Our mechanics make house calls

Q: P0755 & P0700 error codes

asked by on

Car has never had transmission problems but is in 2nd gear limp mode after hitting brakes in rush hour traffic. 2 days before I replaced 2 tires on car. Used tires no balancing. Several months ago I had a fuse blow under hood in the power distribution center. I frequently replaced the 20 amp yellow fuse in cavity 8 to start the car. That is recent history. I am not willing to replace/rebuild transmission. I will trade In if so. What is the most likely fix and cost of that fix in this scenario? Or is it new car time? Thanks!

My car has 133000 miles.
My car has an automatic transmission.

A: The problem with buying used tires and not ...

The problem with buying used tires and not having them balanced is the potential problems they can cause.

Most transmissions - or more specifically, the Powertrain Control Module (PCM) which controls the transmission and drive line - contain incredibly tight tolerance standards in regards to wheel speed, which, when combined with engine RPM, controls shift points. If two tires are not equally-sized (and this could be as minimal as 1/4" of total circumference), it could trigger the 2nd gear limp mode, along with the P0700 generic trouble code.

There are two things you should do before thinking about selling your vehicle:

  1. Verify that the two used tires you bought are of the same manufacturer and style, and have tread depth readings within 2/32nd’s of each other on the front axle.
  2. Have a qualified mechanic inspect the issues you’re having with the blown fuse; an electrical short could be triggering many of these warning lights.
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: Car jerks when shifting gears, check engine light

There are more tests that need to be done before the speed sensor module is replaced. There are about 20 tests that need to be done to verify the number turbine speed sensor is not working properly. These tests are...

Q: Battery is not charging properly

This may be a sign of a weak battery, a failing voltage regulator or failing alternator. As you may know, the alternator is responsible for charging the battery while the engine runs by generating amperage and recharging the battery while...

Q: My 2010 Ford Ranger is not shifting right

Hi there. When this occurs on this transmission it is almost always due to an internal issue with the transmission. The most common issue I have seen is a failure in the front sprag assembly. When this assembly fails the...

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...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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...