Automotive Forums .com - the leading automotive community online! Automotive Forums .com - the leading automotive community online!
Automotive Forums .com - the leading automotive community online! 
-
Latest | 0 Rplys
Go Back   Automotive Forums .com Car Chat > Mitsubishi > Galant
Reply Show Printable Version Show Printable Version | Email this Page Email this Page | Subscription Subscribe to this Thread
 
Thread Tools Search this Thread
Old 01-16-2016, 07:54 PM   #1
mkohanek
AF Newbie
 
Join Date: Jan 2016
Location: Austin, Texas
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
2003 Galant with engine code P0128 going on and then back off after a while

I have driven a 2003 Mitsubishi Galant 4 cylinder for 13 years (starting in December 2002, when I bought it new).

For about 6 months now, I have had my check engine light come on, and then about a week later it will go off. Then in another week or so, back on, and repeat.
When I have had the code read, it was P0128, which from what I have read means:

Quote:
Coolant temp is always low
The powertrain control module verifies that the engine is at a proper operating temperature

Check coolant level
Thermostat defective
ECT (engine coolant temperature) sensor defective
I am hoping to narrow down what it might be, and get tips on how to go forward. The thing that might help in doing that is the fact that the engine light seems to go on and off, so the problem is intermittent.

One thing I seem to notice, is that as the gas tank gets closer to empty, that is when the engine light seems to come back on. Then a little after I fill it up again, the engine light seems to go off.
I cannot say for sure if this is a correlation, or even if that is always the case, but it sure seems to happen an awful lot in that manner.

Does that just mean a faulty sensor or thermostat, or could it be something else? Does this information help narrow down the possible causes at all?
Any tips on the best away to proceed? I do not mind doing the labor myself, as long as it does not require anything too drastic.

Thanks
mkohanek is offline   Reply With Quote
Old 01-16-2016, 07:57 PM   #2
Crvett69
AF Moderator
 
Crvett69's Avatar
 
Join Date: Oct 2004
Location: Bellingham, Washington
Posts: 1,740
Thanks: 0
Thanked 73 Times in 73 Posts
Re: 2003 Galant with engine code P0128 going on and then back off after a while

is your car temp gauge in the dash reading about in the middle of the gauge? if its reading low most likely your thermostat is bad and needs to be replaced
Crvett69 is offline   Reply With Quote
Old 01-16-2016, 07:58 PM   #3
mkohanek
AF Newbie
Thread starter
 
Join Date: Jan 2016
Location: Austin, Texas
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
Re: 2003 Galant with engine code P0128 going on and then back off after a while

Quote:
Originally Posted by Crvett69 View Post
is your car temp gauge in the dash reading about in the middle of the gauge? if its reading low most likely your thermostat is bad and needs to be replaced
I have been keeping an eye on it, and it seems to stay right in the middle
mkohanek is offline   Reply With Quote
 
Reply

POST REPLY TO THIS THREAD


Bookmarks

Tags
galant, p0128
Go Back   Automotive Forums .com Car Chat > Mitsubishi > Galant

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 07:15 PM.

Community Participation Guidelines | How to use your User Control Panel

Powered by: vBulletin | Copyright Jelsoft Enterprises Ltd.
 
 
no new posts