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
  1. Home
  2. Questions
  3. Reduced power loss

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: Car makes a weird sound and doesn't move fast during cold start. 2006 Acura TL

Hi there - many manufacturers program the transmission to hold 1st gear longer when ambient temperatures are very low. This allows the engine to warm up faster, making your heater work more quickly. It also revs the engine more when...

Q: My Car Won't Turn Over. What Is The Problem?

Hello. Thank you for writing in. To start, have you tried jump starting the vehicle? The clicking you are hearing is the starter trying to engage, but not being able to. This is either because the starter has failed, is...

Q: Gear always in Drive

I'm assuming that you mean that the D4 light is lit up on the dash not that the transmission is in gear. The D4 light indicates a problem with the electrical system, and codes will need to be pulled off...

Related articles

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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.