Thread: HVAC modes not working, help me decifer these codes please.

My HVAC isn't responding to my commands when I hit the mode button to cycle through defrost, floor, vent, etc. It just blows mostly out of the defrost and barely out of the vent and flow no matter what mode it's in. All the other functions are working. I'm convinced it's one of those actuators or a vacuum related issue. I looked under the hood and I see nothing out of the ordinary going on with the vaccum lines, however I'm not sure exactly which one I should be looking for. I ran the diagnostics but I have no idea what the numbers should be, maybe someone knows what the heck this stuff means.

-00 00
-01 -140
-02 156
-03 00
-04 00
-05 178
-06 -154
-07 01
-08 -155
-09 00
-10 05
-11 00
-12 120
-13 00
-14 00
-15 32
-16 192
-17 192
-18 36
-19 191
-20 37
-21 00
-22 -113

Having the same issue. Sucks.. I have a 99 GTP coupe.. The door windows fog up and freeze on bad days........

2000 GTP 4dr fully loaded with dual digital climate control.

Quick tutorial video I made for people who don't know what this is. I read about it on the forums. Thanks for watching.

Pretty simple process but a nifty feature to have.

Press and hold both the Driver and Passenger knobs in at the same time for a few seconds until "-00" comes up on the screen. Turn the driverside knob to the desired number and turn the Passenger knob one click to view the data for that position.

I take no credit for the information below.

-00 Error codes (List of Trouble Codes Below)
-01 (servo position) 103-107 43-162
-02 (servo position) 128 120-202
-03 (servo position) 150 162-194
-04 CJ2 Fan Speed Low=15, 29, 44, 58, 71, 86, 110=High, CJ2 Unit will adjust to other increments as needed
-05 (servo position) 93 88-191
-06 (servo position) -152 00-252
-07 (servo position) 00 0, 34-255
-08 (servo position) -155 00-255
-09 (servo position) 00 0, 23-255
-10 ? 04 04
-11 CJ2 Vent Mode 1=Def, 2=Bilevel, 3=Auto, 4=Lower, 5=Def+Lower
-12 Engine Coolant Temp -60 degrees 80=104, 95=131, 100=140 Peak@135°F
-13 Actual Vehicle Speed in MPH
-14 (servo position) 00 21=0
-15 ? 39 44
-16 Radiator low fan turn on temp -106 207
-17 Radiator low fan turn off temp 196 199
-18 ? 50 51
-19 (servo position) 162-169 40-172
-20 Affected by cabin temp sensor 89 50-172
-21 (servo position) 00 ?
-22 Sunload Sensor -117 LIGHT=126, 218=DARK

To return to normal operation, press the "MODE" button next to the passenger temperature knob.

This is a list of the Trouble Codes displayed by the CJ2 Unit.
A two digit code indicates a current fault while a three digit code indicates a historic fault.

Trouble Code Description
00 No System Fault
01 or 101 Inside Air Temperature Sensor Short
02 or 102 Inside Air Temperature Sensor Open
03 or 103 Ambient Outside Temperature Sensor Short
04 or 104 Ambient Outside Temperature Sensor Open
05 or 105 LH Electric Actuator Open or Short
06 or 106 RH Electric Actuator Open or Short
07 or 107 UART Serial Data Line Fault
08 or 108 Solar Sensor Open
To clear codes from the CJ2 Unit, press the A/C Mode button.

AC "Secret" Codes Grand Prix - Car Questions, Answers, and Discussion

Originally Posted by Fivefingerdeathpunch

AC "Secret" Codes Grand Prix - Car Questions, Answers, and Discussion

so yeah, I watched the video and read a couple posts and I'm still lost as far as how the "trouble codes" work. Does it mean I have a trouble code of 01 (inside air temp sensor short) for -07 and 05 (LH electric actuator open/short) for -10?

He's another thing that has me boggled, I noticed when it's warmer out (i.e. above freezing) it works just fine. But sure as **** in the morning when it's fricken freezing is when it doesn't work...