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I was driving down a mountain road today and my check engine light came on at the same time as my electronic throttle control system light. I drove to the nearest auto parts store and got the code read. P2181 and P0441. The first is an engine coolant temperature error, the second is an Evaporative Emission Control System incorrect purge flow error. I've cleared the code to see if any of the errors come back. nothing so far but I've only driven it 10 miles. I find these errors confusing because they all seem to be coming from different seemingly unrelated systems. Can anyone explain to me why these warning lights and codes occurred together? or offer advice on how to diagnose the problem that needs solving. The only thing I've done so far is to check the gas cap seal which I've heard can cause the purge flow error, it looks fine. The car seems to be driving fine although the idle is a little high and erratic, but that has been going on for a half a year now and the dealer couldn't tell me what was wrong.
 

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I don't really see a connection between the two, other than the PCM itself.

The evap circuits are on C1 pins 35 & 38, the coolant temp sensors are on C2 pins 11 & 83

Maybe someone else can chime in with some helpful info.


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I tend to agree with Sandstone, but I would check for ground issues first, they can cause all sorts of strange issues.
 

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I was driving down a mountain road today and my check engine light came on at the same time as my electronic throttle control system light. I drove to the nearest auto parts store and got the code read. P2181 and P0441. The first is an engine coolant temperature error, the second is an Evaporative Emission Control System incorrect purge flow error. I've cleared the code to see if any of the errors come back. nothing so far but I've only driven it 10 miles. I find these errors confusing because they all seem to be coming from different seemingly unrelated systems. Can anyone explain to me why these warning lights and codes occurred together? or offer advice on how to diagnose the problem that needs solving. The only thing I've done so far is to check the gas cap seal which I've heard can cause the purge flow error, it looks fine. The car seems to be driving fine although the idle is a little high and erratic, but that has been going on for a half a year now and the dealer couldn't tell me what was wrong.
Hello,
We're sorry to hear about your continued concern. If you decide to continue working with your dealer, we would be happy to connect you with a Case Specialist to assist. Feel free to send us a PM.
Alex
JeepCares
 

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What year Patriot is it? Checking the grounds sounds like a good idea. There is also a relay box inside the front drivers side wheel well, that sometimes the relays get connections get corroded. It's supposed to be waterproof, but I had to repair a relay connection in that box, can't remember what the code was.
 
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