Chrysler Group is issuing three separate recalls affecting an estimated 51,477 vehicles, including certain Ram trucks and Grand Cherokee SUVs, the National Highway Traffic Safety Administration reported. All three recalls will get under way in August.

In the biggest of the three, Chrysler is recalling 45,961 2013 model-year Dodge Ram 1500 4x4 trucks manufactured June 26, 2012 through Feb. 5, 2013. Because of a software issue with the electronic stability control (ESC) module, the ESC system may be disabled when the vehicle is started, NHTSA said.

Chrysler dealers will update the ESC module software, free of charge, to correct the problem.

A second recall affects 4,458 non-SRT-trimmed Jeep Grand Cherokee SUVs equipped with premium headlamps. These vehicles were all manufactured Jan. 14 through March 20 of this year. When switching between daytime running lights and parking lights, electrical spikes may cause the parking lamps to turn off.

To remedy the problem, Chrysler dealers will update the central body controller software, free of charge.

The third recall affects 1,058 2013 model-year Dodge Ram 4500 and 5500 trucks manufactured Jan. 22 through March 8 of this year. An incorrect bolt may have been used to attach the track bar to the frame. This might cause the vehicle to suddenly pull to one side.

Chrysler dealers will inspect and replace the track bar fasteners, if necessary, free of charge.

Vehicle owners can reach Chrysler at 1-800-247-9753.