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post #1 of 13 (permalink) Old 07-09-2012, 03:35 PM Thread Starter
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Temp Guage Not Working

just replaced the temp sending unit and still not working ( second one ) . this started last winter . would work some times and then stop . when not working the eng. fan keeps running . twice the check eng. light came on . just happened again 2day .. replaced sending unit and worked for a week , now not working . code said , sending unit , low coolent , stuck thermostat .. checked temp and ok ?? thanks for all your help .. one tech said the computer might be on it's way out ... 2007 .......
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post #2 of 13 (permalink) Old 07-09-2012, 03:40 PM
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What were the codes exactly? When it worked did it read properly or was it reading low?

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post #3 of 13 (permalink) Old 07-09-2012, 03:43 PM
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What kind of coolant are you putting in?


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post #4 of 13 (permalink) Old 07-09-2012, 07:29 PM Thread Starter
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temp guage

coolant was replaced when cyl. head was replaced by dealer 16 months ago .
never had a problem with temp ... maxed out @ 217 in summer traffic then came right down .. as far as the code , I went to auto zone for a reading , can't stand dealers .. went there just for warrenty work .. again thanks ..
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post #5 of 13 (permalink) Old 07-09-2012, 07:46 PM
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They tell you what dtc it was?

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post #6 of 13 (permalink) Old 07-10-2012, 06:41 AM
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Thermostat.

Had the same exact problem for a while. Replaced the thermostat a few months ago and have had no such issue.

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post #7 of 13 (permalink) Old 07-10-2012, 05:05 PM Thread Starter
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temp guage

code p0128 came up ...some say the thermostat
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post #8 of 13 (permalink) Old 07-10-2012, 05:40 PM
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Exactly what MP81 says. P0128 is set when engine coolant does not reach intended temperatures in a preset timelaps. This is caused by a weak spring in the thermostat or deteriorated seal causing coolant to bypass upon warm up. So yes, change the thermostat, not a big job if nothing is seized.

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Last edited by Coby7; 07-11-2012 at 06:44 AM. Reason: missing word "seal"
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post #9 of 13 (permalink) Old 07-11-2012, 06:39 AM
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Quote:
Originally Posted by Coby7 View Post
Exactly what MP81 says. P0128 is set when engine coolant does not reach intended temperatures in a preset timelaps. This is caused by a weak spring in the thermostat causing coolant to bypass upon warm up. So yes change the thermostat, not a big job if nothing is seized.
Yup. Actually, it may also be like mine - there is a rubber portion that covers a bunch of 1/4" holes around the main part - that rubber had broken apart allowing coolant to freely flow right through. Both caused the problem of coolant bypass though, and replacing it was a mighty good idea.

But yup, rather easy to change I thought.

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post #10 of 13 (permalink) Old 07-13-2012, 01:42 PM Thread Starter
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temp guage

getting the thermostat changed on monday ... thanks and will let you know the results ...........
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