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06 COBALT LS UNDERHOOD FUSEBOX RELAYS GETTING EXTREMELY HOT!
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COBALT LS 2.2
New User
Nov 13, 2013, 9:08 AM
Post #1 of 6
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06 COBALT LS UNDERHOOD FUSEBOX RELAYS GETTING EXTREMELY HOT!
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RUNNING DOWN THE ROAD, AND THE CAR SHUTS DOWN!
PROBLEM
I bought this 2006 Chevy Cobalt LS with 2.2 engine and auto transmission for my wife.
After a couple of weeks it started giving us trouble. I would be driving down the road and the car would shut down and the on-board computer readout on the dash would say "ENGINE POWER REDUCED." I being a decent DIY'SELFER began diagnosing the problem and came up with nothing. The car after runing for a while would continue to do the same thing, after cool down it would run again, or sometimes after checking the underhood fusebox and making sure that all relays were in tight and fuses were not blown it would start back up. One night while going to pick up my wife from work the car went down and would not start back up. we towed it home and I began an electrical search for the problem. I found that the Powertrain relay and the Crank/Run relay were burned out, so I replaced them and the car started right up. A couple of days later it did the same thing to me again. I checked the relays and they were loose in their ports. I took a really good look at the fusebox itself and found that the box had heat damage and was melting in the area of those two(2) relays.
SOLUTION
I replaced the box and three(3) wires that the connectors were badly corroded. since then the car has been running good. However,
QUESTION
I have noticed that the relays in the underhood fusebox are getting extremely hot during operation of the vehicle.
IS THIS NORMAL? CONCERNED!!!
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Hammer Time
Ultimate Carjunky
/ Moderator
Nov 13, 2013, 9:17 AM
Post #2 of 6
(1858 views)
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Re: 06 COBALT LS UNDERHOOD FUSEBOX RELAYS GETTING EXTREMELY HOT!
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You need a high end scan tool to even start to diagnose this. There is an error occurring in the "drive by wire" system and there will be stored trouble codes to give you a starting point but this isn't a DIYer diagnostic.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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COBALT LS 2.2
New User
Nov 20, 2013, 11:00 AM
Post #3 of 6
(1789 views)
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Re: 06 COBALT LS UNDERHOOD FUSEBOX RELAYS GETTING EXTREMELY HOT!
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Hi HammerTime
Thanks for the heads up, however, I have a scan tool but no dtc's. I would have responded sooner but don't get on the comp. as much as I would like between the wife and kids.
The car has been running great since replacing the fusebox and 3 wires. My only concern now is the hot relays.
COBALT LS 2.2 (AKA) JORGE
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Hammer Time
Ultimate Carjunky
/ Moderator
Nov 20, 2013, 12:14 PM
Post #4 of 6
(1786 views)
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Re: 06 COBALT LS UNDERHOOD FUSEBOX RELAYS GETTING EXTREMELY HOT!
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You don't have a real scan tool. That generic code reader isn't going to cut it.
What are these relays for that are getting hot?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
(This post was edited by Hammer Time on Nov 20, 2013, 12:15 PM)
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COBALT LS 2.2
New User
Nov 20, 2013, 2:07 PM
Post #5 of 6
(1778 views)
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Re: 06 COBALT LS UNDERHOOD FUSEBOX RELAYS GETTING EXTREMELY HOT!
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The relays are to Powertrain, Crank/Run, A/C, Fuel pump, basically they are all getting hot but the hottest are powertrain and crank/run.
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Hammer Time
Ultimate Carjunky
/ Moderator
Nov 20, 2013, 2:40 PM
Post #6 of 6
(1775 views)
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Re: 06 COBALT LS UNDERHOOD FUSEBOX RELAYS GETTING EXTREMELY HOT!
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Relays get hot because they carry current. the more current they carry and the longer they stay on, the hotter they get.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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