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Thermostat open engine light on

Thermostat stays open

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We change thermostats often at my shop. don't buy a cheap replacement either. if you can, get one from the dealer

Posted on Apr 02, 2014

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My engine light came on, code P1281 is what the computer read, what does that mean? and how would I fix it?


Hi...Code P1281 means the engine is staying cold too long - check your thermostat. It is possible your thermostat is stuck in the open position.

Hope this helped,

over4dy

Sep 19, 2011 | 2001 Dodge Durango

1 Answer

Can i drive my rodeo with a stuck open thermostat whats down fall


YOU WILL LOT OF FUEL CONSUMPTION. A OPEN OR MISSING THERMOSTAT WILL CAUSE VECHICLE STAY IN OPEN LOOP.ENGINE WILL BURN RICH BURN MORE FUEL.YOUR THERMOSTAT ALLOWS COOLANT TEMPERATURE TO GET AT A SET POINT WHERE ECM OR PCM ADJUST FUEL SYSTEM FROM OPEN LOOP RICH MIXTURE FOR COLD ENGINE TO CLOSED LOOP TO LEAN OUT FUEL SYSTEM AS ENGINE COOLANT TEMPERATURE GET HOT.YOU NEED TO REPLACE THERMOSTAT.OPEN THERMOSTAT WILL CAUSE NO HEAT PROBLEMS ALSO.

Aug 16, 2011 | 2000 Isuzu Rodeo

1 Answer

The "engine hot/ac turned off light" came on and


after replacing a thermostat you need to wait till the thermostat opens and re add more coolant till its full. if the lite stays on the sensor is most likely bad

Jan 20, 2011 | 2008 Chevrolet Silverado 1500 2WD

2 Answers

It doesn't get warm or hot at all. and when or if it does get warm it takes FOREVER.


I assume you are talking about your engine temperature gauge reading? I had a problem with my 1996 Caravan thermostat (V6 3L). It can get stuck wide open and never allow the engine to operate at the specified temperature. On my vehicle, the thermostat has a metal tab that would prop the valve wide open if it failed. I think the thought of the designer was better to be stuck open than full closed I guess. Anyway, my vehicle temperature would never reach normal range with it stuck open. For my vehicle it is 195 F. This time of year, it would take a very long time before your engine would reach normal running temperature. The interior heater would also take a long time since the engine is also cooler. If your vehicle is newer it can also cause the engine check light to come on because this would affect the emission control systems and keep your engine in a cold engine mode loop...

Not knowing a lot of details of your situation, I would check:

The gauge is working correctly and plugged into the temp sender near the thermostat.

You have the correct fluid level (Please be careful checking this)

Your heater core and engine radiator not clogged with sediment

Flush out your radiator and heater core

Replace your engine thermostat with the specified temperature range your vehicle requires (parts store tech can help you obtain the correct one)

Good Luck.

Jan 01, 2011 | Dodge Stratus Cars & Trucks

1 Answer

Heater will not blow hot air until about 20 mins. after the van has been moving


Could be that the thermostat is stuck open or it was removed. FYI-How the thermostat works: Thermostat is closed when the engine is cold, after the engine reaches a certain temperature the thermostat is supposed to open to allow coolant from the radiator to the engine, if the thermostat fails it will either stay open or closed, so it may take sometime for the engine to heat up.Try that. Good Luck.

Nov 11, 2010 | 2001 Chrysler Town & Country

1 Answer

Temp guage stays on cold and engine warning light


You more than likely have a thermostat that is stuck open. When this is the case with the computerized vehicles today the computer tells your engine that it is still cold and dumps more fuel to the engine. When this happens the extra fuel goes through your exhaust and uaually makes the check engine light come on as you have O2 sensors that register this flow. Replace the thermostat, disconnect the negative side of your battery for 5 minutes and re-connect. If this has been going on for a while the light may come back on. You may have to drive it for a while until it clears all the excess fuel out of the system then do the battery thing again. You probably have been getting poor gas mileage as well. Hope this helped. Just make sure that the engine light does not flash as this is a sign of major problems and you should not drive it if it flashes

Feb 06, 2010 | 2005 Ford Mustang

2 Answers

My engine light is on and the faulty code is P0128, what is this mean?


Trouble Code: P0128

Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)
Possible Causes:


Insufficient warm up time Low engine coolant level Leaking or stuck open thermostat Inoperative engine coolant temperature (ECT) sensor Inoperative Cylinder Head Temperature (CHT) sensor

Dec 04, 2009 | 2004 Ford Focus

3 Answers

How to reset Service Engine light? 2003 Envoy ... Autozone says engine temp too low was reason for light. That's silly. I have gages ... it runs at 180 degrees. I just want the light off.


Ok replace the thermostat which is stucked open, cuz the computer will not go into open loop unless the engine reaches normal operating temperature. You can disconnect the battery, to reset it, but untill you replace the thermostat, the check engine light will pop up again. Good luck

Nov 23, 2009 | 2002 GMC Envoy

1 Answer

Engine light stays on a 97 olds achieva sl


Engine light stays on, low coolant light stays on , recently had a plastic housing replaced that was leaking, it was linked to thermostat, tranmission coolant,heater ect. Had the thermostat replaced also. Level of coolant is fine, does't overheat anymore, but now the starter wants to spin a couple of times and then it starts. The car has no rust, would like to hang on to it

Feb 17, 2009 | 1997 Oldsmobile Achieva

1 Answer

Po128 code on 2001 corvette


replace the thermostat. computer sees engine is running too cool thermostat stuck open.

Nov 10, 2008 | 2001 Chevrolet Corvette

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