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Jeep Wrangler JK
JK General Discussion
P0128 Code
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<blockquote data-quote="Anybodyhome" data-source="post: 436368" data-attributes="member: 19161"><p>I've been getting this lately. I know what it is, but I also am trying to answer a couple questions along the way. And here are my various scenarios I've worked through:</p><p></p><p>1. ECL comes on, run JSCAN and get P0128 code.</p><p>2. Clear code.</p><p>3. Cold start JK, ECL immediately comes on. Question #1- how is this code thrown when the engine is cold? Whether or not I clear the code is irrelevant, it will immediately show when I start hot or cold.</p><p></p><p>1. ECL comes on, run JSCAN and get P0128 code.</p><p>2. Top off coolant (maybe 1" below hot line), clear code.</p><p>3. 1-2 days later, ECL comes on; (you guessed it- same code).</p><p>4. ECL immediately throws code upon starting, hot or cold. </p><p></p><p>1. When ECL came on, as expected, this morning, I ran JSCAN all the way to work on the back roads- 45mph with a few stoplights along the way. Coolant temp never went higher than 187 and was 73 when I started the engine (air temp this morning was 60).</p><p></p><p>At this point, although I'm not real concerned that my engine is running cooler than it should, I'll order a new OEM sensor and likely a new thermostat as well. I'll start with the new sensor for a few days and then pop in the new thermostat if that doesn't solve anything.</p></blockquote><p></p>
[QUOTE="Anybodyhome, post: 436368, member: 19161"] I've been getting this lately. I know what it is, but I also am trying to answer a couple questions along the way. And here are my various scenarios I've worked through: 1. ECL comes on, run JSCAN and get P0128 code. 2. Clear code. 3. Cold start JK, ECL immediately comes on. Question #1- how is this code thrown when the engine is cold? Whether or not I clear the code is irrelevant, it will immediately show when I start hot or cold. 1. ECL comes on, run JSCAN and get P0128 code. 2. Top off coolant (maybe 1" below hot line), clear code. 3. 1-2 days later, ECL comes on; (you guessed it- same code). 4. ECL immediately throws code upon starting, hot or cold. 1. When ECL came on, as expected, this morning, I ran JSCAN all the way to work on the back roads- 45mph with a few stoplights along the way. Coolant temp never went higher than 187 and was 73 when I started the engine (air temp this morning was 60). At this point, although I'm not real concerned that my engine is running cooler than it should, I'll order a new OEM sensor and likely a new thermostat as well. I'll start with the new sensor for a few days and then pop in the new thermostat if that doesn't solve anything. [/QUOTE]
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Jeep Wrangler JK
JK General Discussion
P0128 Code
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