2013 Buick LaCrosse, 2013 Cadillac SRX
The Problem: The software in the automatic transmission may accidentally slip from normal automatic to manual-shift mode. That could reduce the amount of engine braking available and potentially cause a crash. General Motors discovered the problem in a 2014 development vehicle and has not received any reports of crashes from the problem.
The Fix: GM dealers will reprogram the transmission control module on affected cars for free.
Number of Vehicles Potentially Affected: 26,582 2013 Buick LaCrosse sedans and 2013 Cadillac SRX crossovers.
2011 Chevrolet Express CNG
The Problem: Models of the Chevrolet Express that were converted by Impco Automotive to run on compressed natural gas may have an incorrectly built pressure-relief vent pipe. The pipe could vent natural gas into the passenger cabin, which could cause a fire or explosion in the presence of an ignition source like a lit cigarette. GM says there are no reports of fires, crashes, or injuries resulting from this problem.
The Fix: Impco Automotive will work with GM to inspect and repair vans upfitted for CNG fuel.
Number of Vehicles Potentially Affected: 48 2011 Chevrolet Express vans.
Sources: GM, NHTSA