Humidity Sensor Diagnostic Code P1009

3664 Views 22 Replies 4 Participants Last post by arvindram11, 2 mo ago

arvindram11

So my 2017 Touring L Plus with Advanced SafetyTec which has about 24,000 miles recently started blowing hot air occasionally. Took it to the dealership and they got an active code when they ran diagnostics - P1009 (humidity sensor). Turns out this will cost me about $480 to have the dealer replace the humidity sensor. They are apparently back ordered and it will take them about a month to get it.

Has anyone here successfully replaced it themselves? I couldn’t find a YouTube video specifically for the Pacifica showing the location and the replacement. I assume it is one of the sensors that is mounted on the front windshield. I found some videos for the 300 and for Dodge Charger that appear to be similar issues when searching on google.

Trying to see under which cover it would be and how to open said cover without breaking it. Ha ha.

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simo10

· #13 · 6 mo ago

I actually removed this cover before.

You need a small hook tool to reach around the plastic cover. You can't really depress the tabs, the plastic cover snaps over the metal tabs and needs to be "stretched" over. Then you can access the sensor itself. To remove the sensor itself, you will need to pry on the metal tabs of the sensor to remove it. It took me a few minutes to remove the first time.

FYI, I don't believe I have any codes active, but my HVAC in auto mode randomly kicks me out of recirc mode, and sometimes the recirc button just blinks and wont enable. This prevents the air from getting cold enough when it's really hot out. In manual AC mode it works normally. This seems to be a well documented problem with other dodge/chrysler/jeep products that use the exact same part.

I found that tapping on the sensor seems to make it work for a while. I will be replacing the sensor soon.

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simo10

· #15 · 6 mo ago

arvindram11 said:
Thanks, simo10. I am waiting on the new sensor and some pry tools to get to me before trying again. Just worried to put too much pressure on that small plastic cover - worried that I will damage the windshield.

I used a hook tool like this. Place it around the plastic cover right by the tab and pull out and down. Do one side at a time. You barely need to touch the windshield.

Liquid Orange Gas Musical instrument Cone

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simo10

· #16 · 6 mo ago

Also, $480 for the dealer to replace this sensor???? Its a 10 min job with a $50 part, wtf

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simo10

· #19 · 6 mo ago

arvindram11 said:
Just to update this thread - I got the part from Autozone and the hook tool recommended by simo10 above and was able to get the sensor replaced. But no change in AC behavior. The light now stays on for recirculation but AC still blows hot. I may wait until late spring to have this looked at since it is mostly cold days here till probably mid to late April.

uh oh, hopefully you don't have the same problem I had when my AC suddenly stopped working. The Evaporator core was leaking and needed to be replaced which required the whole dash to be removed. I found a local shop that did it for a very reasonable $1600, the dealer would likely been $3000+++ Fingers crossed it's been fine for the time being.

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simo10

· #21 · 6 mo ago

arvindram11 said:
Ugh. Hope not. But I wouldn't be surprised at this point. Did you notice anything leaking under the car when it was parked when this happened? Our van is normally in the garage and I haven't noticed anything odd on the floor.

No, the AC refrigerant is a gas so you wouldn't notice a leak

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simo10

· #22 · 6 mo ago

No, the AC refrigerant is a gas so you won't see a leak.

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