MIke D Posted November 9, 2007 Report Share Posted November 9, 2007 P0125 - Engine Coolant Temperature (ECT) Insufficient for Closed Loop Fuel Control What does this mean. Only started yesterday when it got cold but it is always on first start of the day. Thanks Mike d Cop didn't see it, I didn't do it! 93 STS 225,000 Miles 99 STS 111,000 Miles Link to comment Share on other sites More sharing options...
JimD Posted November 9, 2007 Report Share Posted November 9, 2007 Two possibilities. First would be your coolant temperature sensor has failed and is providing false information to the PCM. Or, your thermstat has failed open (possible, but unlikely). How is your coolant temperature guage on the DIC behaving? Jim Drive your car. Use your cell phone. CHOOSE ONE ! Link to comment Share on other sites More sharing options...
MIke D Posted November 10, 2007 Author Report Share Posted November 10, 2007 Two possibilities. First would be your coolant temperature sensor has failed and is providing false information to the PCM. Or, your thermstat has failed open (possible, but unlikely). How is your coolant temperature guage on the DIC behaving? Like normal... Stays cold till I get the car moving. Then goes to almost 12 O'Clock and does not move. Never overheats. Never stays on "cold" the whole time. Cop didn't see it, I didn't do it! 93 STS 225,000 Miles 99 STS 111,000 Miles Link to comment Share on other sites More sharing options...
JimD Posted November 10, 2007 Report Share Posted November 10, 2007 I would be inspecting the chassis wire harness at the coolant temperature sensor connector for damage/corrosion/loose connector pins. Jim Drive your car. Use your cell phone. CHOOSE ONE ! Link to comment Share on other sites More sharing options...
Ranger Posted November 10, 2007 Report Share Posted November 10, 2007 Got codes? Link to comment Share on other sites More sharing options...
Logan Posted November 10, 2007 Report Share Posted November 10, 2007 This diagnostic test monitors the Engine Coolant Temperature sensor after a timer has reached 4.25 minutes. The PCM looks at the test conditions every second, and increments the timer each time the test conditions are met. After the timer has reached 4.25 minutes, if ECT is less than or drops below 5°C (41°F) for 3 seconds, DTC P0125 will be set. If ECT is greater than 5°C (41°F), the test will be considered passed regardless of the timer. The timer will be decremented if the PCM is disabling fuel to any cylinder during traction control maneuvers, acceleration reduction, torque management, etc. The timer will reset only when the engine stops running. Conditions for Running the DTC DTCs 112,113,117 or 118 not set. Engine running. Intake air temperature 0°C (32°F) or more. Vehicle speed at least 10 MPH. Conditions for Setting the DTC At least 4.25 minutes have passed since test conditions were met and engine coolant temperature is less than 5°C (41°F) for 3 seconds. Action Taken When the DTC Sets The PCM will illuminate the Malfunction Indicator Lamp (MIL) when the diagnostic runs and fails. The PCM will record operating conditions at the time the diagnostic fails. This information will be stored in the Freeze Frame and Failure Records. Conditions for Clearing the MIL/DTC The PCM will turn the MIL OFF after three consecutive drive trips that the diagnostic runs and does not fail. A Last Test Failed (current) DTC will clear when the diagnostic runs and does not fail. A History DTC will clear after forty consecutive warm-up cycles with no failures of any emission related diagnostic test. Use a scan tool to clear DTCs. Interrupting PCM battery voltage may or may not clear DTCs. This practice is not recommended. Refer to Clearing Diagnostic Trouble Codes in PCM Description and Operation. Diagnostic Aids If fault is not present check for an intermittent cooling system problem. Logan Diagnostic LLC www.airbagcrash.com www.ledfix.com www.ledfix.com/yukontaillightrepair.html www.ledfix.com/ledreplacements.html www.ledfix.com/j42385toolrental.html Link to comment Share on other sites More sharing options...
MIke D Posted November 10, 2007 Author Report Share Posted November 10, 2007 It only sets the code on first start up. I have not tried to let it sit there for 3 sart ups later to see if it clears out on it's own. I usually hit the computer and erase them. (I hate having lights on on my dash) As long as it's not a big deal I will just forget about it for now. Just kinda stinks that is happened the day after I just put in new shocks tires and tierods.... Like I need another thing to fix right now Thanks for the help guys, you all came through again. Mike D Cop didn't see it, I didn't do it! 93 STS 225,000 Miles 99 STS 111,000 Miles Link to comment Share on other sites More sharing options...
Cadillac Jim Posted November 10, 2007 Report Share Posted November 10, 2007 Letting this go too long may damage your catalytic converter. I would get it now. If the miss happens at start-up, you may have a leaking FPR. That's a throwaway part that is an analog part of the fuel injection that doesn't set codes on its own. -- Click Here for CaddyInfo page on "How To" Read Your OBD Codes-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data -- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC Yes, I was Jims_97_ETC before I changed cars. Link to comment Share on other sites More sharing options...
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