Skip the auto shop - Our mechanics make house calls

Q: I might be having transmission issues but then i think it could be a engine problem.

asked by on

So i have recently received this truck for a graduation present. Before i have received it the truck had a bad transmission. We replaced the transmission however the "new" transmission we put in the truck came out of a 2004. Now the truck wont allow us to go over 40 mph because it will shut the engine down. What is going on???
My car has an automatic transmission.

Hello,

From what you describe it appears that whatever problem your vehicle may be experiencing has caused it to go into limp mode.

Limp mode is a precautionary mode where the power and speed of the vehicle are severely limited. It is activated when a major issue is detected in order to protect the vehicle’s components from sustaining possible damage.

Limp mode can be caused by a wide variety of issues including engine, transmission, mechanical and electrical issues.

You mention that the transmission was recently replaced with one from a different year.

I would first verify with a dealership or knowledgeable parts person that the transmission is in fact compatible with that vehicle, and if it is, then move on to verifying that the installation was properly carried out. Double check all harnesses, connectors, and mounts to make sure that there are not any issues.

If everything appears to be sound, then I would recommend having the vehicle inspected by a professional technician, as again, limp mode can be activated by a wide variety of issues.

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!
  • Home
  • Questions
  • I might be having transmission issues but then i think it could be a engine problem.

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: Truck tugs during acceleration when letting off the brake pedal

What you'd want to do is jack the car up when it acts up like this. Check the wheels and see if they are sticking. If they are sticking, fix that first. If the back ones are sticking, you'll need...

Q: I have a 2006 Ford F-150 triton V-8 one of the cylnders is not getting compression

If you have one cylinder not producing compression then you need to find out why it is not getting compression first. You should have a cylinder pressure test to see if you have excessive air leaking due to a bad...

Q: Reinstalled valve body incorrectly.

I would seek a diagnosis from a certified transmission mechanic. He should be able to get everything back where it is supposed to go no problem. Transmissions are very complex and he will have the training to get if fixed...

Related articles

Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
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.