Skip the auto shop - Our mechanics make house calls

Q: Reduced power loss

asked by on

I had to get a boost after my car sat for 6 months now I am getting a power loss light an air bag light and a power steering lights coming on its running very rough and when I shut the car off it continues to run for a few seconds

My car has 120700 miles.
My car has an automatic transmission.

A: There are a few things you can do, but a sc...

There are a few things you can do, but a scan tool will be required at some point. Newer cars have a lot of electrical demands. When you jump start a car that has a dead battery, the battery has to charged by the alternator. It is not designed to have that kind of load on top of providing power for everything else.

Your car has electric power steering by the way. The power steering light, and the air bag light, are most likely the result of too high, or too low, system voltage. This should be verified by checking for stored trouble codes.

What you can do is to have the battery charged and tested. A good battery can take 8 hours to charge at 15 amps. Much longer on a trickle charger. The power loss light is the computer telling you that it will give you limited engine throttle. This could be a problem with the electric throttle motor or sensors, or it could be another problem, like a misfire. The computer will reduce power output when it detects a misfire to prevent damage to the catalytic converter.

The engine could have a misfire for many reasons. It could be a problem with the ignition system, such as a spark plug or ignition coil. You may have a fuel quality issue due to it sitting for an extended amount of time such as fuel separation, or water in the fuel.

What you can do is top off the tank with fresh gasoline. I would suggest with this host of problems is to have all of the systems scanned for trouble codes. Each one will need to be diagnosed individually. Once the cause of the lights is determined, and repaired, then the codes can be erased and the systems checked for proper operation. If you need help in doing so, consider the assistance of qualified technician who can diagnose the trouble codes and fix your vehicle at your home or office.

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

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: I have a 2006 nissan altima 2.5s......when im driving my temp will go all the way up to high but drop down to the normal area when

Typically, a coolant flow issue can cause the temperature to climb while driving. A clogged cooling system or a partially opened thermostat can cause this. A cracked head gasket is a possibility but with the age and mileage of the...

Q: I have an intermittent misfire - 2002 Pontiac Grand Prix

Hi and thanks for contacting YourMechanic. The EGR can cause a misfire if it is stuck open when the engine is cold or running at a lower speed. The EGR replaces some of the air with burnt fuel to help...

Q: Hesitation/stalling when engine gets warm.

It sound like the fuel pump is stopping after it gets hot. A problem with the pumps starts when it begins to stall intermittently and get worse and worse over time. It may start up and go for a while...

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...
P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
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...