Buick Has a Bewildering Message
When diagnosing a 2010-2015 Buick LaCrosse or 2011-2015 Regal for a “Service Stability/Traction” message, you may find DTC C0710 with symptom code 71 set in the EBCM. For vehicles equipped with electric power steering, a “Service Steering” message may be present also set in the power steering control module (PSCM).
When servicing the steering angle sensor (SAS) using GDS the technician may have difficulties in learning the SAS using GDS2. The display screen may just continue to read “Waiting” or may display an error message. Upon rechecking for codes, the technician may find one or more of the following DTCs: U0074, U0077, U180D, U0293, U0126, U0125, C0186, C0196 or C0287. These DTCs may be unable to be cleared.
When learning SAS, check for Diagnostic Package updates for GDS2 and make sure it is on the latest update. If, after diagnosing the chassis bus for the cause of the fault is not found, check for an MDI cable to DLC issue. Try another MDI cable and perform SAS learn.