Skip the auto shop - Our mechanics make house calls

Q: Sudden Reduced Power when running fine - stop, restart, all is fine - what's wrong?

asked by on

When my truck is running all od a sudden the reduce engine power turns and my looses velocity so what i have to do is pull over turned the engine off and turned back on and will work perfectly so what do u think it can be...

My car has 230000 miles.
My car has an automatic transmission.

Hi there - first thing to check when experiencing a Reduced Power Light condition is for any problem codes that might still remain, even if the Check Engine light is not on now. There are several possible causes - an overheating condition, which would have been evident on your coolant temp gauge. A malfunction of the throttle position sensor, even if temporary, can cause this scenario. The TPS has a dual-measurement system for redundancy if one or the other fails. If engine management senses a difference in readings between the two - it goes to Reduced Power mode. Restarting the truck would have cleared it as long as no permanent condition existing. I would recommend a Reduced Power malfunction inspection. This inspection will check out the components most likely to invoke this condition. A mobile, professional mechanic, such as one from YourMechanic, will come to your location, diagnose this problem, give you an accurate assessment of damage and cost estimate for repairs

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
  • Sudden Reduced Power when running fine - stop, restart, all is fine - what's wrong?

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: Vehicle shut off while driving and will not restart, what could be the problem?

Hi there. Do any of the combination meter lights come on when you turn the key on? If not, then it sounds like the alternator may have failed and the battery became completely discharged. Have the battery tested, and recharged...

Q: Overheating after replacing water pump, thermostat and coolant temp. Sensor

Hello. That hole in the water pump is there to let you know when the bearing in the water pump is failing. It starts leaking when the bearing is going out so that it will be replaced prior to a...

Q: Car shakes when I slow down.

Hello. The imbalance of rotating parts on a car, such as your wheel and tire assemblies, is a function of speed but also "positioning". When you were traveling at a steady state rate, say 65 MPH, the suspension was clearly...

Related articles

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...
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...
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...