Skip the auto shop - Our mechanics make house calls

Q: No power. Transmission shifts down and engine revs up but doesn't go anywhere

asked by on

While driving up hill the truck will lunge forward sometimes. Then go right back to normal. Also the service engine light comes on and I pulled the code and it says knock sensor error. So I changed the knock sensor. But I'm still having the problem. When the SEL comes on the truck will shift down and the engine revs up but the truck doesn't pull. It just barely feels like it has any power. At this point I just don't know what to do
My car has an automatic transmission.

Hi there. In some cases, what you’re describing is caused by a restriction of fluid inside the hydraulic lines of the transmission, an inner seal that is damaged or the torque converter wearing out. This issue can sometimes be resolved by simply flushing the transmission fluid and changing the filter; while other internal transmission repairs are needed. The best advice I can offer is to start by flushing your transmission fluid and change the filter. If this resolves your issue; great. If not, feel free to have one of our mobile mechanics come to your location and complete a car is hard to shift inspection.

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
  • Home
  • Questions
  • No power. Transmission shifts down and engine revs up but doesn't go anywhere

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: Fuel tank leaking

Q: Anti-theft keeping car from starting

The ignition switch in your vehicle has likely went inoperative. Replacement involves a tear down of the steering column and grinding the switch bolts. Afterwards, a 30 minute key re-learn procedure is required. If you need assistance with this, a...

Q: Oil loss, can't find a leak, smoke coming from tail pipe and checked coolant this morning was foamy and a different color.

Hello there, there are a few causes for this type of issue. The vehicle should not be driven or started until repairs have been performed. A fault is causing the engine oil and coolant to mix together. When this happens,...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...
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...