Question about GMC Yukon

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Engine running cold- p0128

I just have had the radiator replaced. I have let the car heat up multiple times and have taken off the reservoir cap. I have also tried to run the car for 20 min without the cap. The car continues to run cold (around 165) and causes the service engine soon light to come on. I have driven the car almost 200 miles since the radiator has been replaced. 2001 yukon denali

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  • 161 Answers

Shouldn't really be a big problem if it's running a bit cold, can you reset the sensor via the diagnostic obd plug, this may stop the warning light coming on

Posted on Mar 24, 2014

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Posted on Jan 02, 2017

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  • 375 Answers

SOURCE: '04 GMC Yukon Denali Check Engine Light

Did u put in fuel shortly before the light came on? I own 2 service centers & the most common situation with "Check Engine" lights are because the fuel cap wasn't re-installed or not tightened. When you refuel make sure it "clicks" when putting back on. We don't charge for a "Code Reading" but a dealer will, don't go there. Go, like the others suggested. If it is the fuel cap & you re-install it correctly, the light will go off after a short drive. Good Luck. PS-Don't panic when the "Check Engine" light comes on unless it blinks, if that happens don't drive. PSS-RE: Murray's, Auto-Zone.......If it's a "Code" (the reader will give a #) the code book will tell you the problem. PSSS-Some1 please have Troy W's Mommy & Daddy take away his keyboard. Just because you can put together a "Lego" car doesn't make you a master mechanic. You only repeated what we said except you have a "Napoleon" complex against any1 plugging something in to a vehicle. It's the same as plugging in a light @ home. In conjunction with "kinder" nine out of ten time in my experience it usually is the oxygen sensor(s) which would be about right with the year model

Posted on May 18, 2008

ewashmidas
  • 362 Answers

SOURCE: P0172 and P0128 Error Code 2003 Trailblazer 4WD

PO172 means that an oxygen sensor in bank 1 detected a rich condition (too little oxygen in the exhaust). I would replace the thermostat first. The computer could be injecting too much fuel because it thinks it never gets to operating temperature. That may keep the light off.

Posted on Jan 28, 2009

Mr BrokRench
  • 1623 Answers

SOURCE: service engine light staying on

Hello tdamm...No...the service engine soon (SES) light on your yukon is not telling you to change the oil.
This is a warning light that is illuminated when there is a problem affecting the Emission system and the engines computer management (ECM) has detected it from a fault. It could be something as simple as a loose or defective gas cap. If the SES light is blinking, it's more serious....
The yukon needs to be connected to diagnostic equipment (scanner) for fault diagnosis.
You can go to autozone they will hook up an OBD II scanner to your vehicle and explain the codes to you.
Good luck...i hope this helps and will fixya up.

Posted on May 25, 2009

  • 534 Answers

SOURCE: 2001 dodge stratus engine temperature gauge spikes occasionally

Look for a loose connection to the temperature sender unit on the motor.
If all connections OK, you may need a new temp sender unit.

Posted on Jul 28, 2009

  • 4 Answers

SOURCE: 2001 Galant service engine light on & won't stay running/ runs rough

Try this: Disconnect the ecm control (where the air filter is housed)
Let me know if that worked.

Posted on Oct 30, 2009

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I have a 97 jeep grand cherokee...the radiator hose is collapsed. Does that mean I need to replace it or add more fluid or something else?


Hi , it sounds like you have caused a vacum i.e. not enough water in the system. You have to check you car when the engine and water has cooled down. The expansion tank is were the water level has a line you must fill it up to the level line with water when the engine is cold. And when its cold weather you have to use antifreeze to top up the level.

Jan 08, 2016 | 1997 Jeep Grand Cherokee

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Why is my thermo fan running comstantly at high speed ? Engine temp ect all good


I have heard of cases where there is enough coolant in the plastic bottle (reservoir) but, there is not enough coolant in the radiator itself. When the car is COLD (important - hot water and steam will burn you!!), remove the radiator cap and fill the radiator itself with coolant. In the COLD condition, remove the radiator cap, then start the car and while the engine is running, fill the radiator with coolant until the coolant is stagnant at the filler spout, then quickly replace the cap otherwise the engine will heat the coolant up and will start blowing out the top! If this doesn't fix the problem, replace your radiator cap and if that doesn't help either, replace the thermostat. Lastly but not likely, it might be a problem with the temperature sensor.

Apr 27, 2015 | Cars & Trucks

1 Answer

My coolant isnt leaving the reservoir tank and now my car is blowing smoke of the tail pipe and it seem to be blow heat into the car


When the engine is cold, open the radiator cap and fill with coolant/water mix to top.
Run the engine with your heat on high fan, high heat, wait for the engine to cool again and fill the radiator again. You must get to the point where when you open the radiator cap when it is cold that the radiator is full to the top.
Gary

Jul 21, 2011 | 1999 Plymouth Voyager

2 Answers

Coolant reservoir is overfulling after being driven


It probably got overfilled at some point. There's a max line on the reservoir that you shouldn't fill it over. Coolant expands as it heats up so if there's too much in the system, it's normal for it to overflow.

May 26, 2011 | 2001 Jaguar S-Type

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My heater blows cold air when car is stopped. i have installed a new water pump and the radiator is full of water.


you still have air trapped in the cooling system. Get front of car as high up as you can on a hill. Cold engine - loosen radiator cap, fill with 50/50 antifreeze mix. Start engine and run until upper radiator hose is hot (thermostat open). Engine should burp air and maybe spill some coolant, that's ok. Once burped, tighten cap, shut off engine and let it cool down while keeping the reservoir full. It will **** coolant out of reservoir as it cools. Keep it full.

If still cold air, take to a shop that has evac/fill equipment; they will **** air out and repalce with coolant. About $80.

gerry

Jan 26, 2011 | 1989 Mercury Colony Park

1 Answer

The car is over heating--radiator needs water added every day--no visible leaks.


Check ur RADiATOR if its CLOGGED! Checking it by means of TOUCHiNG the BOTTOM PART after running ur engine for 30 min. If the bottom part is not the same as the TOP part of the radiator, it means its CLOGGED and u need to bring to ur nearest garage mechanic to FLUSH OUT or internally clean the radiator assembly! Check also the RADiATOR FAN if it works in a certain temperature! If can't see any leakage, as u say, 'cause of high temperature of ur engine, ur COOLANT goes to the coolant reservoir and overflowing it every time ur engine HEATS UP! Check also the RADiATOR CAP, if the seals are damage or the spring is all corroded up, water heats up and goes thru ur reservoir and doesn't come back to ur radiator when engine colds down, radiator caps FAULT!
Hope that might help u out! Taaah!

Nov 12, 2010 | 1988 Toyota Camry

1 Answer

Replaced thermostat, water continues to overheat and is expelled out the cap to the water reservoir. Water heat gauge show low heat then spikes to extreme high intermittently.


You have air pockets in the system. With the engine cold, remove the radiator cap. Then run the engine until the thermostat opens as you top off the radiator and keep an eye on the temperature gauge. If you think the car is going to overheat, replace the radiator cap, shut off the engine and wait 15 to 20 minutes to let the engine cool. Once the thermostat opens, lightly grab the upper radiator hose to feel for air pockets. You will feel the bubbles as they pass through the hose. Then have someone else rev the engine to 1800 - 2000 rpm and hold it there while you top off the radiator completely and then install and tighten the radiator cap. DO NOT DROP THE RPM BEFORE THE CAP IS SECURED OR YOU MAY BE SERIOUSLY BURNED!! Finally, let the engine run and monitor the temperature and road test. You may have to repeat the steps 2 or more times to remove all of the air but usually it will clear the first time.

May 18, 2010 | 1998 Ford Expedition

1 Answer

No heat ..help installed new heater switch, replaced water pump..replaced coolants, and thermostat......................what else could it be? Nissan 2003 GXE Sentra 1.8 L Engine/...


you could have an air pocket in the cooling system that has to be burped. With a cold engine, park uphill and leave the radiator cap loose. Fill radiator and coolant reservoir. Start engine with cap loose and run at 1500 rpm until temp gauge reads normal. Feel if top radiator return hose from engine to radiator is hot. If yes, coolant is flowing and thermostat is open. If cold, thermostat is not staying closed until engine is hot.

report results.

Oct 29, 2009 | 2002 Nissan Altima

2 Answers

No heat


if you replaced the thermostat, you have an air bubble trapped in the engine. So, you don't have any coolant running through the heater core, therefore no heat.
sometimes hard to "burp" air bubble. Try this. Park park facing uphill and jack up front of car too. You want to get radiator opening higher than top of engine. Then remvoe radiator cap (cold engine), fill radiator, then fill coolant reservoir to full point. Install radiator cap but leave it loose so air can escape. Start engine until upper radiator hose going into radiator is hot. This should burp air. Repeat a few times while adding coolant mix (50/50 antifreeze) to keep radiator full. Be careful not to remove radiator cap when engine is hot.
lwt us know how ou make out. There is a more complicated procedure but you need tools and knowledge of where air bleed is on top of engine

Jan 03, 2009 | 1998 Mercury Villager

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