GM Repair Questions? Ask a Mechanic for Answers ASAP
Greetings and Welcome to Just answer.
OK, the first thing I want to try is after you start it again, sit on the back of your vehicle to lower it and see if it responds to the change in height. If not then you will need to get the code from the system.
Diagnostic Trouble Code (DTC) Displaying
The Air Suspension system has an internal clock to prevent overheating if the compressor assembly is running for a prolonged period of time. If the system overheats, all leveling function stops until the system cools down. During this time, the indicator LED on the air inflator switch will be quickly flashing at a constant rate.
The other three diagnostic trouble codes are displayed with a blink code on the inflator switch LED. The Air Suspension Compressor Assembly shall begin to indicate the code when the condition to cause the code becomes current.
The number of the fault code shall be represented by the number of flashing pulses on the inflator switch LED. The flashing pulses shall have a repetition rate of 0.5 seconds and each code shall be separated by a 3.0 second delay. All codes shall be flashed in the order of occurrence of the fault. The blink code shall take priority over other processes that have access to the inflator switch LED.
Let me know the code and I will assist you further.
THat is in the rear trim inside behind an access panel most likely right.
OK, I think the issue is with the level sensor on the reat suspension.