08 CTT with air suspension problem right after factory warranty expired. 51K Just replaced the air compressor which recently just jumped in price to $1800.
6-8 hours of down the drain and still no power to the compressor after recharging the system. They checked the system for leaks and nothing present. If power is externally put the compressor comes on which makes the dealer think its the ecu which was upgraded to the Techart lowering module.

Now dealer thinks maybe its my Techart lowering ecu module $3K.

My question is does this sound like the air suspension ecu problem. I hate to waste another 3K for nothing.

thank you,

 

they can't check if there's power going into the module??

 

There is a relay for the compressor. Check that first. If the Techart lowering module works like the H&R module, it's plugged-in in-line with the factory module. Just remove it and plug the factory module in and see if it works.

 

Thanks for the reply guys.
The compressor does not come on but when power is put externally it fires up.
The relay has been changed and all lines check with the right pressure in front and back.
I unfortunatly do not have the stock ecu since the techart module is a full replacement modul. What sucks is that the car just ran out of factory warranty 51K and Techart only warranty's 24 month which mine just surpassed.

Why would there be no codes on pwis if lowering ecu modul was bad though?

 

The control module is what performs the diagnosis. It's quite possible that it doesn't realize it's faulty. Like how a crazy person doesn't know they're crazy.

 

Good example lol
New ecu on the way.