SaturnFans.com
saturnfans.com - classifieds - forums - webmail


Go Back   SaturnFans.com Forums > Models > Saturn L-Series > L-Series Tech

Reply
 
Thread Tools Display Modes
Old 04-26-2012, 12:24 AM   #1
metro_88
New Member
metro_88 is on a distinguished road
 
Join Date: Apr 2012
Location: Minnesota
Posts: 3

2004 L-Series 3.0L Sedan
Default Help with begining to troubleshoot a P0128 code?

Hello all!

I'm trying to investigate the P0128 error code on my mother-in-law's 2004 L300 V6 sedan (63K miles). I see the P0128 is a common problem around here, but after reading through a dozen or so threads with different sorts of problems and solutions, I'm a bit stumped on where to start.

Her CEL came on in December and she's been driving around with it on since then. I reset the CEL a week ago with my OBD II scanner, hoping it was a one-time nuisance, but within a day or so, it was back on.

Ideally, I'd like to fix this problem without taking it in to a mechanic since my mother-in-law is on a tight budget. That said, I'm mostly inexperienced in car repair (though I've replaced oil, brake pads and rotors, spark plugs, and ignition coils, before), but am hoping to learn more.

Can anyone give me a few hints on where to start troubleshooting the problem on her L300? She knows nothing about the car's history, so I'll be starting from scratch. I'd be happy to provide additional information, if it's needed.

Thanks so much!
metro_88 is offline   Reply With Quote
SaturnFans.com Sponsored Links
Old 04-26-2012, 05:53 AM   #2
fdryer
Super Member
fdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond repute
 
fdryer's Avatar
 
Join Date: Jan 2006
Location: NYC
Posts: 45,240
 

2003 L-Series 3.0L Sedan
Default Re: Help with begining to troubleshoot a P0128 code?

Welcome to Saturnfans!

Search some more (within the L-series tech forums) as you haven't hit threads with pictures yet (one thread is mine). Briefly, the P0128 simply means 'replace the worn out thermostat' as its running cooler than the EFI system desires. You will need to understand that access will require removing most of the top end; main intake manifold, front intake manifold, 5/6 flex couplers, fuel rail, intake manifold spacer, throttle actuator, and miscellaneous parts. Set aside one whole morning or afternoon for this procedure.
...
VCX NANO
fdryer is offline   Reply With Quote
Old 04-26-2012, 11:08 AM   #3
metro_88
New Member
metro_88 is on a distinguished road
 
Join Date: Apr 2012
Location: Minnesota
Posts: 3

2004 L-Series 3.0L Sedan
Default Re: Help with begining to troubleshoot a P0128 code?

Thanks Fdryer, that's quite helpful.

Can you or anyone else tell me the consequences of continuing to drive the car, at least for a while, with the thermostat broken in this manner?

Many thanks!
metro_88 is offline   Reply With Quote
Old 04-26-2012, 11:28 AM   #4
fdryer
Super Member
fdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond reputefdryer has a reputation beyond repute
 
fdryer's Avatar
 
Join Date: Jan 2006
Location: NYC
Posts: 45,240
 

2003 L-Series 3.0L Sedan
Default Re: Help with begining to troubleshoot a P0128 code?

The t-stat isn't broke as much as its not working at the rated temperature and is allowing the engine to operate at a cooler temperature. Nothing bad will occur as you can continue using the car as is. At worst, fuel mileage may drop some. If this occurred during the winter months the heater may take a little longer before heat occurs.

Enjoy the car as is and decide when to replace the t-stat.
...
VCX NANO
fdryer is offline   Reply With Quote
Old 04-26-2012, 11:31 AM   #5
metro_88
New Member
metro_88 is on a distinguished road
 
Join Date: Apr 2012
Location: Minnesota
Posts: 3

2004 L-Series 3.0L Sedan
Default Re: Help with begining to troubleshoot a P0128 code?

Quote:
Originally Posted by fdryer View Post
The t-stat isn't broke as much as its not working at the rated temperature and is allowing the engine to operate at a cooler temperature. Nothing bad will occur as you can continue using the car as is. At worst, fuel mileage may drop some. If this occurred during the winter months the heater may take a little longer before heat occurs.

Enjoy the car as is and decide when to replace the t-stat.
Thanks again for your help. If it's not urgent or not going to lead to larger (more expensive) problems, we'll find the right time to tackle the project in the future.
metro_88 is offline   Reply With Quote
Reply

Bookmarks

Tags
2004, l300, p0128, thermostat


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
P0128 code on 03 Vue cooxl231 Vue General 32 04-18-2012 10:21 AM
showing code 1 of 1 ..............P0128!!!! rayzur9 Vue Tech 25 01-20-2012 10:33 AM
03 Vue throwing code P0128 mattwiant Vue Tech 12 12-15-2009 09:10 PM
Code p0128 nevets S-Series Tech 2 01-03-2009 11:48 PM
P0128 code issue bubba1ton S-Series General 7 05-17-2006 04:25 AM


All times are GMT -4. The time now is 09:26 PM.

Advanced Forum Search | Advanced Photo Search


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
SaturnFans.com. The Saturn Enthusiasts Site.