Question about 1997 Jeep Grand Cherokee

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Coolant sensor bad is being indicated in the panel. what is this and what should i do?

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If you have a 4.0 engine it's near the thermostat housing on other engines it's on the intake manifold usually on one of the coolant passages up front. What id does besides operating your overheat light or temp gauge is that it tells the computer what the tem is so the computer can turn on the electric fan and make other engine adjustments as necessary.

Posted on Jun 03, 2009

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My 2008 Pontiac torrent gage is stuck at the top where the over heating mark is but there is no other indicators that it is overheating what does this mean.


The engine control module (ECM) calculates the engine coolant temperature as determined by the coolant temperature sensor. The ECM sends the engine coolant temperature to the body control module (BCM) via the serial data circuit. The instrument panel cluster (IPC) displays the engine coolant temperature when the BCM sends a serial data message to the IPC indicating the engine coolant temperature. The engine coolant temperature gage defaults to 0° or below if:
• The ECM detects a malfunction in the engine coolant temperature sensor circuit.
• The IPC detects a loss of serial data communications with the BCM.
• The BCM detects a loss of serial data communications with the ECM

The place to start would be to hook up a factory or professional scan tool to see what the actual coolant temperature is ! At the PCM then at the BCM and finally at the instrument cluster . If normal the gauge is bad . The instrument cluster would need to be taken out of the vehicle an sent to be repaired . Or you could buy a used one out of a salvage yard or from on e-bay etc....

Dec 30, 2016 | 2008 Pontiac Torrent

1 Answer

What would be the cause of sudden Intermittent engine overheat?


The gauge in the instrument cluster could be going bad ! maybe. Is that what your going by ? You need to have it hooked up to a scan tool ,not a code reader . It will tell what the ECT - engine coolant temperature sensor is reporting to the PCM - engine computer .The PCM turns on the cooling fans when the temp. reaches 262 degrees ! Are the cooling fans coming on ? Thermostat sticking ! Go to harbor freight an buy a Laser Temp Gun Infrared Thermometer , $30.00 . point it at the upper radiator hose an see what the actual temp is !
Engine Coolant Indicators
TEMP ?€¢
The instrument panel cluster (IPC) illuminates the TEMP indicator when the powertrain control module (PCM) determines that the coolant temperature is more than 128?°C (262?°F). The IPC receives a discrete input from the PCM requesting illumination.

?€¢
The IPC performs the display test at the start of each ignition cycle. The IPC illuminates the TEMP indicator.

Is the cooling system full of coolant ?
The instrument panel cluster (IPC) displays the engine coolant temperature as determined by the engine control module (ECM). The IPC receives a serial data message from the ECM indicating the engine coolant temperature. The IPC receives the coolant temperature information via serial data message from the body control module (BCM). The engine coolant temperature gage defaults to 60?°C (140?°F) or below if:
?€¢
The ECM detects a malfunction in the engine coolant temperature sensor circuit.

?€¢
The IPC detects a loss of serial data communications with the ECM.

?€¢
The IPC detects a loss of serial data communications with the BCM


Infrared Thermometer Gun Review

Sep 17, 2015 | 2008 Chevrolet Impala

1 Answer

Low coolant level indicator keeps coming on even though coolant is full


I don't believe this is a reset issue. The sensor is in the overflow tank. Make sure the level is at or just a bit above the level indicator. The sensor may be bad or blocked, but I think this is where your issue is. The sensor shows on the side of the overflow tank.

Dec 06, 2011 | 2001 Oldsmobile Aurora

2 Answers

Check engine is on says P0128its fails.


www.obd-codes.com/p0128
Coolant temperature below coolant regulated temperature. Usually a bas coolant temperature sensor. Replace sensor.

Dec 23, 2010 | 2005 Dodge Stratus

1 Answer

Vw jetta 2002 code p1296/po118


Both of these codes indicate trouble with the signal from the coolant temperature sensor.

So either the sensor is bad. The thermostat is not working properly and the coolant temperature is truly way out. The wiring to the sensor is short or open. The computer is bad and it is manifesting itself through this fault.

Does the car warm up properly? If it runs hot, or takes forever to warm up, this indicates a problem with the thermostat.

If the car runs at the proper temperature the next thing to look at is the coolant temp sensor and wiring. Some resistance values for VWs are here:
http://forums.vwvortex.com/zerothread?id=4267675

You might also be interested in this recall if your car is below 100k miles:
http://forums.vwvortex.com/zerothread?id=3694323

Jan 19, 2010 | 2002 Volkswagen Jetta TDI

1 Answer

Engine heat indicator flexuates, but engine


There is a coolant temperature sensor on the top engine block to measure the temperature. Either the connector is loosen or the temp sensor is bad. This sensor is bad will cause the gauge reading fluctuated. Locate the temp sensor and replace it to take care of the problem.

Dec 12, 2009 | 2001 Nissan Altima

2 Answers

'coolant sensor bad' message flahses on lcd panel.


The coolant temperature sensor is most commonly located near the thermostat housing. It will have 2 wires connecting it. Don't confuse this sensor with the coolant temp sending unit that controls your gauge temp, which generally has 1 wire connecting to it. Removal and replacement of the coolant temp sensor is fairly simple and best of all, it's cheap. You'll pay maybe $15-$20 for it and I would HIGHLY recommend replacing it! It is arguably the most important sensor on your vehicle, as it tells the computer how rich/lean to run the engine based on its temperature. As it ages, the thermistor inside the sensor can tend to run out of calibration and may cause the computer to think the engine is much warmer or cooler than it really is. This can lead to hard starting, rough operation, overly rich/lean fuel mixture, etc.

I hope this helps! Please let me know if I can be of further assistance in this matter. :)

Nov 14, 2009 | 1997 Jeep Grand Cherokee

1 Answer

Replace coolant level sensor


THESE SENSORS ARE A KNOWN PROBLEM REPLACE IT, IT IS HELD IN BY A WIRE RETAINER CLIP, IT IS LOCATED IN THE PLASTIC SIDE TANK OF THE RADIATOR NEAR THE TOP OF THE TANK, ENGINE SIDE. THE PART IS ABOUT $60.00

Jul 17, 2009 | 2000 Oldsmobile Silhouette

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