Mechanics

CHEVY P0405 ERROR CODE

1999 Chevrolet Suburban

Engine Performance problem
1999 Chevy Suburban V8 Four Wheel Drive Automatic 189000 miles

1999 Chevy Suburban V8 Four Wheel Drive Automatic K1500 5.7 L Vortec Engine. Engine will start and runs fine when cold.
After1-2 miles driving engine, it will not come up to
speed. When I go to start it back up their will be no power but the lights and electrical will flicker on and off and will automatically set the settings to cd and time to 1: 00. Also today the electrical locked all of my doors while I was sitting in it. The battery was put in in Oct04. I replaced the post on the battery 2 months ago. When I go to restart it after it has died on me I have to loosen and retighten the positve post on the battery to get it to start. I had the battery checked today and it read 588/690 AMPS. I know that reads a little low and the battery should be replaced. I put it on a computer and it read P0405 EGR Sensor " A" Circuit low. I recently did an oil change and changed fuel filter hoping to get better mpg. I have had this problem in the past but it always seemed to fix itself. I replaced the starter 2 months ago when it came to not starting at all. I would appreciate all the help possible.
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Homey09
September 5, 2010.



If the battery was replaced in 04 that means it's 6 yrs old. Batteries are good for about 4 years then it's on borowed time. When a battery go bad the computer is always trying to find good voltage. First replace the battery with a good one. And Clean all your grounds- body and engine. Batteries have to be load tested with a load tester. If your voltage drops steadily to lower than 9 volts and if it only reads 12.2V initialy then your battery isn't any good and will set a bunch of codes or make it seem that you have problems. Of course you may still have the problem but you need to start with a good battery.

Hmac300
Sep 9, 2010.