Question about 2002 Mercury Grand Marquis

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Displays 104 when it is 65 control is whacky'is it sensor or thermostat, or what

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  • gerry bissi May 11, 2010

    electronic cluster?

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  • Mercury Master
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Try this test for codes


Electronic Automatic Temperature Control Module Self-Test

  • The EATC module self-test will not detect concerns associated with data link messages like engine coolant temperature or vehicle speed signals. A diagnostic tool must be used to retrieve these concerns.
  • The EATC module self-test will detect concerns in the system control functions and will display hard diagnostic trouble codes (DTCs) in addition to intermittent diagnostic trouble codes for concerns that occur during system operation. The vehicle interior temperature should be between 4°-32°C (40-90°F) when carrying out the self-test. If the temperatures are not within the specified ranges, false in-car temperature sensor DTCs will be displayed.
  • The self-test can be initiated at any time. Normal operation of the system stops when the self-test is activated.
  • To enter the self-test, press the OFF and FLOOR buttons simultaneously and then press the AUTOMATIC button within two seconds. The display will show a pulse tracer going around the center of the display window. The test may run as long as 30 seconds. Record all DTCs displayed.
  • If any DTCs appear during the self-test, follow the diagnostics procedure given under ACTION for each DTC given.
  • If a condition exists but no DTCs appear during the self-test, GO to Symptom Chart Condition: The EATC System Is Inoperative, Intermittent or Improper Operation.
  • To exit self-test and retain all intermittent DTCs, push the blue (cooler) button. The control will exit self-test, retain all intermittent diagnostic trouble codes and then turn OFF (display blank).
  • To exit the self-test and clear all DTCs, press the DEFROST button. The vacuum fluorescent display window will show 888 and all function symbols for one second. Then, the EATC control assembly will turn OFF (display blank) and all DTCs will be cleared.
  • Always exit the self-test before powering the system down (system turned OFF).
  • Intermittent DTCs will be deleted after 80 ignition switch ON cycles after the intermittent condition occurs.

Posted on Jul 30, 2009

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Posted on Jan 02, 2017

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I have a 2006 Buick Lucerne V6 code po128 comes up. What does it mean?


P0128 BUICK P0128 BUICK - Engine Coolant Temperature Below Thermostat Regulating Temperature Repair Importance Level: 3/3 Repair Difficulty Level: 2/3 help.jpg Share facebook.png twitter.png linkedin.png google-plus.png sep.png print.png pdf.png share.jpg 3 comments.png ' Add Comment xicon.jpg http://www.autocodes.com/p0128_buick.html Forum Code Possible causes - Leaking or stuck open thermostat
- Low engine coolant level
- Insufficient warm up time
- Faulty engine coolant temperature sensor
- Engine coolant temperature sensor harness is open or shorted
- Engine coolant temperature sensor circuit poor electrical connection
help.jpg What does this mean? Tech notes If cooling system is not leaking and the fluid level is OK, replacing the thermostat usually takes care of the problem.
help.jpg What does this mean? When is the code detected? If the Powertrain Control Module (PCM) detects the calibrated amount of air flow and engine run time have been met, and the Engine Coolant Temperature (ECT) has not met the minimum thermostat regulating temperature, the code P0128 will set. Possible symptoms - Engine Light ON (or Service Engine Soon Warning Light) P0128 Buick Description An Engine Coolant Temperature (ECT) sensor monitors the temperature of the coolant. This input is used by the Powertrain Control Module (PCM) for engine control and as an enabling criteria for some diagnosis. The air flow coming into the engine is accumulated and used to determine if the vehicle has been driven within the conditions that would allow the engine coolant to heat up normally to the thermostat regulating temperature. If the coolant temperature does not increase normally or does not reach the regulating temperature of the thermostat, the diagnostic that use ECT as enabling criteria may not run when expected.



Read more: http://www.autocodes.com/p0128_buick.html#ixzz3vprh5jzz

Regarding which thermostat to use, I am guessing it depends on where you live.

Ask these people when you order the thermostat.

http://www.autopartswarehouse.com/shop_years/buick-lucerne-thermostat-2006.html

Dec 30, 2015 | 2006 Buick Lucerne

1 Answer

Egine overheats


You did not mention the Thermostat which controls the temperature of the engine. Did you mean the Thermostat when you said temp sensor? If not, then change the thermostat.

Mar 05, 2015 | 2003 Chevrolet Impala

1 Answer

I have a 2004 xuv and the speedometer and ther gauges go whacky until I pull the fuse and reset it. I was told it was a short in the dashboard and would cost over $400 pluse labor. Anybody know a fix


$400? wow. When things get "whacky" with the guages, replace your ignition switch. NOT the switch your key goes into, it's located on the bottom of the steering column. Need to remove the plastic skirt that coveres the steering wheel column.

Mar 17, 2014 | 2004 GMC Envoy

2 Answers

Outdoor thermometer reads -40 so the climate control system blows heat in the summer


sound like faulty out side air temperature sensor located center radiator support.

May 20, 2013 | 2001 Chrysler Town & Country

1 Answer

Does 2007 Suzuki have a thermostat or just a sensor?


Both. The thermostat controls engine temp, and the sensor tells the ECU how warm it is and also send that info to the gauges. coolant has to flow in order for the thermostat to work.

Nov 09, 2012 | 2007 Suzuki Forenza Sedan

1 Answer

Car not heating changed thermostat flushed and no heat ??


Hi, You could have a bad temperature sensor or sending unit. I would lean more towards the sensor. The sensor controls when the thermostat opens and closes by reading the temp of the engine. The sensor is located somewhere around your thermostat or thermo housing.

Jan 25, 2011 | 2002 Ford Taurus

1 Answer

2000 Jeep Grand Cherokee with a 4.0L engine... the temperature only rises to about 150 degrees and stops... sometimes lowers a bit even at highway speeds. Normal operating temp is about 210-215 degrees. ...


The thermostat controls the temp of the engine. The temp sensor tells the gauge what temp to display. If the heater is still putting out a lot of heat then it may be a false reading temp gauge. If however the temp is noticibly cooler then replace the thermostat. A stuck open thermostat would also cause the engine to warm up slowly. check for a loose/dirty connection at the plug on the temp sensor.

Nov 24, 2010 | 2000 Jeep Grand Cherokee

1 Answer

Coolant doesn't heat up!


the temp sensor just tells you the temp of the coolant and it controlls the coolant fan to turn on and off at a certain temperature........have you check for coolant leeaks???

Nov 23, 2008 | 1994 Honda Accord

1 Answer

Car doesn't warm up


It does sound like the thermostat. The sensor does not control the thermostat in any way, it only reads the temperature of the coolant. Your symptoms are classic of a thermostat that is stuck open or partially open. Take it back and tell them what is going on and have them show you that the thermostat is fine.

Nov 23, 2008 | 1994 Honda Accord

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