Some Cadillac Escalade owners may notice that their SUV’s air leveling suspension system is inoperative, or it may be exhibiting a low or leaning suspension condition. Now, a possible cause behind this issue has been identified, as has a possible fix to be performed by a GM technician.
According to a recent report from GM TechLink, the air leveling suspension system may affect 2021- through 2023-model year Cadillac Escalade units, and may trigger a “Service Leveling System” message in the Driver Information Center. What’s more, the issue could result in several different Diagnostic Trouble Codes (DTCs), some of which may not immediately appear to be related to the suspension, including U0222 (Lost Communication with Front Side Door Window Regulator Motor – Driver), U0223 (Lost Communication with Front Side Door Window Regulator Motor – Passenger), U0224 (Lost Communication with Front Side Door Window Regulator Motor – Passenger), and U0225 (Lost Communication with Rear Side Door Window Regulator Motor – Right).
Additionally, using the GM Global Diagnostic System 2 (GM GDS2) to perform a Short Term Inflate function may indicate that the function is working properly on the GDS2 screen, even though it is not.
Per the GM TechLink report, these issues may be the result of a communication loss with a power window motor, or possibly a door ajar issue, both of which are more common on up-fitted vehicles.
In order to address this issue on the Cadillac Escalade, GM technicians should first check for any door ajar DTCs, or a loss in communication. The Cadillac Escalade’s air leveling suspension relies on the door ajar status to function properly, with each door ajar switch hardwired to the related door window motor. If a DTC for loss of communication with a door window motor is triggered, the door ajar status will not be reliable.
To fix this, GM techs must open and close each door and ensure that the door position matches the related GDS2 parameters. Once repairs are performed on possible door ajar DTCs or loss of communication with a door window motor, the GM tech should next reassess the air suspension issue.