Skip the auto shop - Our mechanics make house calls

Q: Loud knock and not truck will not drive when gas pedal is pressed down

asked by on

We were driving approx. 70 mph and heard a loud noise from under the truck. It sounded like we ran over a huge rock the hit the bottom. Pulled off right away and parked. Truck will turn on and shift into gear but will not move forward when I step on gas pedal. What might be wrong and will it roll if in neutral for tow?
My car has a manual transmission.

This sounds like you broke a driveshaft or the clutch broke causing the transmission to not engage. You should look at the driveshaft to see if it is intact on the transmission and rear end. If you have 4 wheel drive you may have broke something in the transfer case. Have a mechanic like one from YourMechanic come and check truck to determine what broke.

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
  • Loud knock and not truck will not drive when gas pedal is pressed down

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: After serpentine belt slipped off transmission won't go into reverse

It may be possible that the belt struck and bent a shifter linkage component. I suggest having a certified technician diagnose your gear slipping issue, including an inspection of the shifter linkage for proper adjustment or damage.

Q: My 2002 Ford Expedition is running too lean with misfires.

Hello. It sounds like you may have a few issues going on here. I usually start by checking the codes in the computer myself. This will give me a good idea of what my be going on and what cylinders...

Q: I have a 2008 Toyota Matrix manual transmission that won't move in gear.

Hi there. Your clutch appears to have failed. This is what occurs when the clutch plate goes bad and no longer engages. You will need to have a transmission specialist take a look at this and replace it if needed....

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...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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...