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Jeep Wrangler JK
JK General Discussion
Engine Code P0128 2017 JK
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<blockquote data-quote="Anybodyhome" data-source="post: 454830" data-attributes="member: 19161"><p>Yep. Had the same code. I posted an extensive, detailed diagnostic and corrective path I took some time back in this forum.</p><p>Typically a stuck open thermostat will cause this. Easiest diagnosis:</p><p>With a cold engine, have someone start your JK with your hand wrapped around the upper radiator hose and if you can feel flow immediately or within a few seconds of start up, this is the first indicator the t-stat is open. It's not supposed to open until the engine is at operating temp, and when it iopens, that's when you should get coolant flow through the hose. </p><p></p><p>This first test is the easiest, doesn't cost a penny and will almost always give the info you need to either begin looking elsewhere or just replace the t-stat.</p><p></p><p>And, as JJ stated above, make sure you get an OEM t-stat. Get the option with the housing, which is black ABS plastic. Much easier to install that putting a new t-stat in the old housing. <a href="http://Partsgeek.com" target="_blank">Partsgeek.com</a> was the cheapest and quickest ship time, that's where I got mine.</p><p></p><p>[ATTACH=full]123506[/ATTACH]</p></blockquote><p></p>
[QUOTE="Anybodyhome, post: 454830, member: 19161"] Yep. Had the same code. I posted an extensive, detailed diagnostic and corrective path I took some time back in this forum. Typically a stuck open thermostat will cause this. Easiest diagnosis: With a cold engine, have someone start your JK with your hand wrapped around the upper radiator hose and if you can feel flow immediately or within a few seconds of start up, this is the first indicator the t-stat is open. It's not supposed to open until the engine is at operating temp, and when it iopens, that's when you should get coolant flow through the hose. This first test is the easiest, doesn't cost a penny and will almost always give the info you need to either begin looking elsewhere or just replace the t-stat. And, as JJ stated above, make sure you get an OEM t-stat. Get the option with the housing, which is black ABS plastic. Much easier to install that putting a new t-stat in the old housing. [URL='http://Partsgeek.com']Partsgeek.com[/URL] was the cheapest and quickest ship time, that's where I got mine. [ATTACH type="full"]123506[/ATTACH] [/QUOTE]
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Jeep Wrangler JK
JK General Discussion
Engine Code P0128 2017 JK
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