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Jeep Wrangler JK
JK General Discussion
P0128 Code
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<blockquote data-quote="Danarch" data-source="post: 441720" data-attributes="member: 21093"><p>Not sure my post was clear. The CEL is for the P0128 code which is for an engine operating below the designed operating temp. Just trying to figure out possible causes or where to start. </p><p></p><p>I agree is seems odd that that engineer reaches 226 and heater seems to work okay if the t-stat was stuck open. I’ve had that happen on other cars and they never reach operating temp. So I am little confused as to why the code is for low coolant operating temperature. If it was low then why would it reach 226 before cooling down. </p><p></p><p>I know that our dash tempature on each of our JK’s read low for about 10 minutes before they are accurate. Is there a way to adjust this? BlackJKU mentioned he heard of it causing issues. Not sure how or why or how to fix it. I’ll do some checking after dinner if I have time.</p></blockquote><p></p>
[QUOTE="Danarch, post: 441720, member: 21093"] Not sure my post was clear. The CEL is for the P0128 code which is for an engine operating below the designed operating temp. Just trying to figure out possible causes or where to start. I agree is seems odd that that engineer reaches 226 and heater seems to work okay if the t-stat was stuck open. I’ve had that happen on other cars and they never reach operating temp. So I am little confused as to why the code is for low coolant operating temperature. If it was low then why would it reach 226 before cooling down. I know that our dash tempature on each of our JK’s read low for about 10 minutes before they are accurate. Is there a way to adjust this? BlackJKU mentioned he heard of it causing issues. Not sure how or why or how to fix it. I’ll do some checking after dinner if I have time. [/QUOTE]
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Jeep Wrangler JK
JK General Discussion
P0128 Code
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