Question about 1998 Jeep Grand Cherokee

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I am getting a bad coolant sensor reading on the information screen what could this be

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This problem is frecuently in this models, check the levels and Reset your ECU.

Review the #8 wire in a ribbon connector, the factory that made the VICs use a wave soldering method, and the #8pin (which is the coolant sensor ground pin- IIRC it's pink- will havea cold solder joint. If you can see faults in this connections,it takes about 15 minutes to get the VIC out of the car, and if you cansolder, another 5 to fix the problem. I'd advise re-soldering all theconnections, while you're in there.

If the problem stay there, just change your coolant sensor.

Good luck, and remember rated this help.

Posted on Oct 06, 2009


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You have to clear the codes. Go to your Ford dealer (not all can do this). The cheaper solution is go to your local auto parts store and ask them to clear the codes. It's usually free. Sometimes some codes won't come off when you use the "remove the positive cable from your battery and touch it to the negative post for about 10 seconds". Careful hear, do it right as if you get a spark you are doing something wrong. As to the auto parts store they can or should give you all the codes including the new ones as I think you didn't disconnect the battery when you you changed the sensor.

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I have a 1993 K1500 with the 5.7L and I need to know what a code 15 is

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Electronic display says coolant sensor bad. I replaced the sensor located in the recovery bottle, but it still reads bad?

Good Evening, I can certainly understand your problem, I fought with a 97 grand cherokee with the same problem, at the end of all the troubleshooting it ended up being the information display module. Certainly it is something to consider, especially changing the sensor a couple times to be sure. Hope this helps, If you have any more questions please feel free to ask.

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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).
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Check the inside of the plug and make sure that the prongs are in good condition. They may be corroded. Napa sells a replacement pigtail for the plug.

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