Question about 1998 Jeep Grand Cherokee

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Bad coolant sensor flashes on the information display

The dealer replaced the coolant sensor and it still happens. It usually when the engine is warm. There is no overheating. There is no coolant leak. The coolant resevior is at the max line.

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Take it back to the dealer and then have them check the computer to see if something else comes up. But this is not right that they did not solve the problem. Insist that you get some concrete service and a better answer. The '90's were not the best years for the Grands and there were recalls. The VIN should be checked to see is there were prior recalls.

Posted on Jun 29, 2009

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No help so far. 2002 Dodge Stratus Replaced timing belt. misses at Idle. warm up it dies. No codes in computer. Compression good 180 average all 4 cylinders. Need help please.


Corrosion in electrical connections causes some bad behaviors. Usually there is a critical temp sensor that provides block temp information to the ECU. It usually has a two or three wire connection to the sensor. And a difficult to remove connector. My 20yr old (other make) gave me a bout of teriable starting when cold. I found this "special sensor" (some people say the sensor needs to be changed. I found that cleaning to bright metal provided the needed almost like new start without needing to replace the sensor. On mine there is a second "simple" temp sensor one wire to the dashboard temp display. Hope this helps.

May 12, 2015 | 2002 Dodge Stratus

1 Answer

2007 Chevy Silverado 2500 HD. I was driving and my digital dashboard reported engine hot and AC turned off. My temperature gauge read cool. What do I need to replace?


This sounds like a bad coolant temp sensor that give computer false reading, check the coolant temp sensor connector and if it is good with no bad wires to connector then replace coolant temp sensor , when the computer gets a signal from temp sensor that engine is hot it turns fans on high speed to cool radiator and displays a/c turned off , if this truck does not have electric cooling fans then they wont run just explaining what happens depending on engine and cooling set up. replace coolant temp sensor and check connector.

Dec 25, 2012 | 2007 Chevrolet Silverado 2500HD

1 Answer

Before i spend money on a maf sensor i wanted to get a second opinion on my symptoms?


Check out a new coolant sensor. Some vehicles have 2 and one works the dash gauge and the other is needed for Engine management(Fuel mix, timing). Ask at Autozone or go to Advance, or Oreilys for a second scan.
The O2 sensors control how the engine runs. Sometimes they will self-clean, but if you have a bad indication, they should be changed. I usually work on Ford brands but this is pretty universal. The scanners should also tell you which O2 is bad out of the many you may have on your car.

Oct 23, 2011 | 2001 Cadillac DeVille

2 Answers

I have a problem on my chevrolet the check engine light on and the code is p0010 p0128 and p0641 thank you.


Causes A code P0010 may mean that one or more of the following has happened:
  • Faulty oil control valve (OCV)
  • Open or short in the VVT/VCT circuit
  • Open or short in the OCV / solenoid valve
  • Damaged computer (PCM)
Possible Solutions Some recommended troubleshooting and repair steps are:
  • Carefully inspect the Bank 1 VVT/VCT system circuit wiring and connectors, repair as required
  • With a warm engine, test the operation of the OCV, replace/repair as needed

A code P0128 may mean that one or more of the following has happened:
  • Low engine coolant level
  • Leaking or stuck open thermostat
  • Faulty cooling fan (running too much)
  • Faulty coolant temperature sensor ECT
  • Faulty intake air temperature (IAT) sensor
Possible Solutions Past experience indicates that the most likely solution is to replace the thermostat. However here are some suggestions on troubleshooting and repairing a P0128 OBD-II code:
  • Verify coolant strength & level
  • Verify proper cooling fan operation (check if it's running more than it should). Replace if necessary.
  • Verify proper engine coolant temperature (ECT) sensor operation, replace if necessary.
  • Verify proper intake air temperature (IAT) sensor operation, replace if necessary.
  • If the above items check out good, replace the thermostat
P0641 is a generic code for a possible bad ECU. I would first fix the other two issues and then clear the check engine light and see if it comes back on. If it does, then you have a possible bad ECU and will need to run further tests to see if that is the case or not

Jun 30, 2011 | 2006 Chevrolet Cobalt

1 Answer

I have a 92 yj 2.5l 5 speed. it has only after warming up a misfire/rough idle. its fine when its cold and once it warms up and idle comes down it misfires/idles really rough. may be lacking power also. i...


check that the EGR valve is not sticking or has a vacuum leak. This valve will not operate until the engine is warm.

check also the engine coolant temp sensor (ECT). This sensor tells the engine computer that the engine has warmed up, so if it is faulty, it could be sending wrong information to the computer. If the sensor is disconnected, wires to it broken, or faulty in full cold mode, it will tell the computer that the engine is very cold, like -40F. The computer will schedule fuel for cold conditions. This is usually way too much fuel for a warm engine and it will rich misfire, idle rough, and be difficult to start warm.

The ECT has two wires going to it and is dedicated to sending information to the engine computer. It has nothing to do with your dash gauge that shows coolant temp. That sender has only one wire and is dedicated to the coolant temp gauge.

Feb 21, 2011 | 1993 Jeep Wrangler

1 Answer

When the engine warms up it idles really fast, the display says coolant sensor bad, replaced it, same problem


Your coolant sensor is not getting a good ground tap into the ground side of the sensor and run a wire to the battery negative "-".

Nov 13, 2010 | Jeep Grand Cherokee Cars & Trucks

2 Answers

My indicator stated that I had a "bad coolant sensor." The warning would come on then go off every other day. Well this afternoon, after driving around all day, my 1996 Jeep Grand Cherokee started to...


What repair did you make when the "bad coolant sensor" light came on? If you did nothing, I'm sure you know that not only does the sensor give you temperature info, it also tells the computer when the engine is warmed up so it can properly manage fuel delivery. That same information tells the computer when to turn any auxiliary electric fans on, or to modify the engine timing to cool down the engine.
At this point your only best option is to replace the sensor, the thermostat and re-fill with the proper mix of coolant. Check everything over for leaks and hope you have not sustained any major internal engine damage (head gaskets or cracked heads).
Good luck!!

Jun 06, 2010 | 1996 Jeep Grand Cherokee

2 Answers

Engine coolant temperature is lower than thermostat


This happens when the Engine Coolant Temperature (ECT) does not reach 75°C (167°F) despite sufficient engine warm-up time.

This happens usually when the thermostat/temperature sensor is faulty, and is bad for emissions and fuel consumption.

The repair cost may vary, even if themperature sensor is not an expensive part, after replacing the sensor there is need to reset the ECU (car computer module).

Nov 23, 2008 | 2001 Pontiac Grand Prix

2 Answers

Heating System


The Engine Coolant Temperature (ECT) sensor is mounted in the intake manifold and sends engine temperature information to the ECM. The ECM supplies 5 volts to the coolant temperature sensor circuit. The sensor is a thermistor which changes internal resistance as temperature changes. When the sensor is cold (internal resistance high), the ECM monitors a high signal voltage which it interprets as a cold engine. As the sensor warms (internal resistance low), the ECM monitors a low signal voltage which it interprets as warm engine.
0900c1528008f125.jpgFig. 1: View of the Engine Coolant Temperature (ECT) sensor 0900c1528008f126.jpgFig. 2: Engine Coolant Temperature (ECT) sensor locationTESTING
See Figures 3 and 4
  1. Remove the ECT sensor from the vehicle.
  2. Immerse the tip of the sensor in container of water.
  3. Connect a digital ohmmeter to the two terminals of the sensor.
  4. Using a calibrated thermometer, compare the resistance of the sensor to the temperature of the water. Refer to the engine coolant sensor temperature vs. resistance illustration.
  5. Repeat the test at two other temperature points, heating or cooling the water as necessary.
  6. If the sensor does not meet specification, it must be replaced.
0900c1528008f120.jpgFig. 3: Intake Air Temperature (IAT) and Engine Coolant Temperature (ECT) sensor wiring diagram 0900c1528008f095.jpgFig. 4: ECT sensor temperature vs. resistance values

Oct 01, 2008 | 1993 GMC Sierra

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