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955 A/C control unit coding after replacement?


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Hi guys,

I had some issue with the A/C in my 04 CTT. mostly the noise also some vents did not output consistent temperature.

so I replaced 3 servo motors according to the error code. output temp. seems alright after that. but the noise was still there.

so last month I replaced the control unit. everything seemed to be working in the first week. but now the noise came back. constant squeaky rat running kind of noise.(A/C function works without any obvious problem in terms of air temp and air flow rate)

I plugged in my Durametric this morning and found the following codes:

1042 control module not coded

1087 basic setting not implemented

my question is: do I need to take the car to dealer to re-program the control module? would that solve the noise problem?

please help.

thanks,

Roy

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Fault code 1042 -- Control module not coded
Possible cause of fault
- No or incorrect basic setting (no coding written in off-road stabilizer control module)
Note: This fault code is only issued if a new, 'uncoded' control module was installed, which does not yet contain any coding

Fault code 1087 -- No Basic Setting

Possible cause of fault
- Air-conditioning system was not calibrated
Can you clear these codes?
Is so, I would clear them and see if they come back.
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Do you have the off-road stabilizer package on your car?

If you do, then I would have the dealer/OPC try re-programming those modules before replacing any of them -- and of course make sure your battery is less than 4 years old and strong (do a load test).

Even a slightly weak battery has caused some strange things to happen in Cayennes.

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wvicary,

do you mean the big blower motor? it seems that the noise is from behind the PCM system rather than the passenger side foot well.

I changed 3 flap step motors according to the error code from Durametric. it did solve the problem of un-even temperature at front outlets.

let me know what do you think, thanks

Roy

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