Buick TSB #G-158994
2012 Buick Regal
Affected Component: ELECTRICAL SYSTEM:SOFTWARE
- 12238D - Service Update (revised part numbers & instructions). The generator control module (GCM) may not function properly, resulting in the gradual loss of battery charge, illumination of the MIL, and eventual engine stall or no start condition. Dealers are to inspect and replace, if necessary, the GCM.