Help with error codes

[Ryan Sears]

2014 Model S P85D

I’ve got a strange issue where the cabin temperature whether in auto or manual will suddenly switch from cooling to heating on any temp setting except low. Meaning if it’s 90° outside and I have the interior temp set at 67° all of a sudden my car will start heating full blast and turn the cabin into a sauna. I can mitigate by lowering temp to low setting but freeze myself out.

Here are the error codes I’m getting

THC_d0022_RCCMSensor
THC_d0021_RCCMActuator
THC_d0018_activeAero


I’ve ordered an
interior temp/humidity sensor
A rccm
a hvac interior control valve actuator


My right front grille is stuck open cause something hit it and broke it but I don’t think that would cause this issue all of a sudden. It’s been broken since I’ve owned the car 6 months back.

 

[Ryan Sears]

 

[GHammer]

Both of my S's of that vintage always show those three codes and HVAC works fine. In researching them it seems all cars of that age display those errors so probably not relevant to your issue.

 

[Ryan Sears]

Oh really that’s interesting. Maybe it is just the cabin sensor. I found it was covered in fuzz

 

[Ryan Sears]

As an update for anyone, I pulled apart the dash. Found the main inlet actuator was clicking. But first replaced the cabin temp/humidity sensor and my hvac has been working 100% for days now. Stress tested in over 100° weather on my road trip down to Los Angeles.