P0125 OBD II code
- Thread starter DougL3NC
- Start date
tdesanto
Expedition Leader
Clear the code and see if it comes back. I've gotten this code a hundred times, but only when towing and only then when I'm climbing hills and mountains on the highway. When I get back to flat land, the code goes away on its own before I can get it to the dealership. I've taken it to the dealership several times and they have never been able to find the culprit. Driving around town or even long distances without the trailer, I never see this code.
Based on the Scangauge readings from the ECU, the coolant temp is usually around 209-213 degrees F whenever this happens. Whenever the engine isn't stressed by towing uphill, the temp usually hovers around 206 degrees.
So, I've never been able to make sense of it myself, and as I said, my dealership cannot either.
Based on the Scangauge readings from the ECU, the coolant temp is usually around 209-213 degrees F whenever this happens. Whenever the engine isn't stressed by towing uphill, the temp usually hovers around 206 degrees.
So, I've never been able to make sense of it myself, and as I said, my dealership cannot either.
Last edited:
I have cleared it and it comes back. Just like you, it would come on when I went to the mountains or towed my big utility trailer...but now it comes back on every time I clear it here in the flat lands.
Seems to affect my fuel mileage a little, 12 instead of 13.5:ylsmoke:
I will change the thermostat and see what happens...as these things are NOT known for running cool!
off-roader
Expedition Leader
If you do replace it, try to get an OEM thermostat. Also test the unit before putting it on. Thermostats are known to be problematic with many not working new out of the box.:Wow1:
Is there possibly more than one temp sender for that?
Unfortunately I'm not that familiar with gen III's & what components are relevant to cause that error or I'd chime in with other areas to check. Hope you figure it out and it's an easy/cheap fix.
Update!
UPDATE!
Replaced the thermostat with a factory MM unit that works brilliantly...I now have heat before I reach the end of the drive way.
BUT...The damn light still comes on after I clear it out!!!
Someone on another board suggested I might have a failing O2 sensor, but I get no code for that...just P0125!
I'm at my wits end with this issue.:Wow1:
Any more ideas?
UPDATE!
Replaced the thermostat with a factory MM unit that works brilliantly...I now have heat before I reach the end of the drive way.
BUT...The damn light still comes on after I clear it out!!!
Someone on another board suggested I might have a failing O2 sensor, but I get no code for that...just P0125!
I'm at my wits end with this issue.:Wow1:
Any more ideas?
speedtre
Explorer
There appears to be a TSB on this for 2001/2002 Monteros....
http://www-odi.nhtsa.dot.gov/cars/p...=10001033&type=VEHICLE&searchtype=QuickSearch
http://www.mitsubishisucks.com/cars/bulletins/usa/parts/engine/montero.html
The answer here seems to indicate that you can have a perfectly functioning thermostat (which explains you getting heat properly) but there is a temperature sensor that reports to the ECM and it may be bad an need to be replaced.
http://answers.yahoo.com/question/index?qid=20080324185134AASEbX7
Damnit man! Guess I'm going to phone the Stealer and see about getting it checked out.
p0125 code
Very possibly your problem
-----------------------------------------------------------------------------------
No.: TSB-07-13-002
DATE: January, 2007
MODEL: 2001-04 Montero
SUBJECT:
PCM REPROGRAMMING FOR DTC P0125
This TSB supercedes TSB-04-13-011, issued October, 2004 to revise the required MUT-III cable and to add the 12-13 pin adapter for 2002-04 models. Revised information is indicated by [<].
PURPOSE
Incorrect PCM software parameters may cause Diagnostic Trouble Code P0125 to set when the vehicle is driven in cold ambient temperatures. To eliminate this condition, reprogram the PCM as described in this bulletin.
AFFECTED VEHICLES
2001-04 Montero
Very possibly your problem
-----------------------------------------------------------------------------------
No.: TSB-07-13-002
DATE: January, 2007
MODEL: 2001-04 Montero
SUBJECT:
PCM REPROGRAMMING FOR DTC P0125
This TSB supercedes TSB-04-13-011, issued October, 2004 to revise the required MUT-III cable and to add the 12-13 pin adapter for 2002-04 models. Revised information is indicated by [<].
PURPOSE
Incorrect PCM software parameters may cause Diagnostic Trouble Code P0125 to set when the vehicle is driven in cold ambient temperatures. To eliminate this condition, reprogram the PCM as described in this bulletin.
AFFECTED VEHICLES
2001-04 Montero