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.

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

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!

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: My car's oil cooler line is leaking antifreeze

Hello. From what you describe, it appears that you are being provided with conflicting information. Oil cooler lines will usually leak oil, as oil is what flows through those lines. If the engine is leaking coolant, then it is either...

Q: Do I have to change the engine mounts and bellhousing when switching to the 3.9l?

The engine should bolt up to the transmission, but the 4t45e has a lower torque rating than a 4t65e so pushing more power through it might cause problems. There may also be a few subtle issues with mounting the new...

Q: Oil leak after hitting dip

If you hit a dip, and then started leaking oil it is very possible that you may have damaged your oil pan, or the gasket. I would recommend having a professional technician, such as one from YourMechanic, look at the...

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...
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...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.