Code b13 What does code b13 mean on the dashboard?

It's a maintenance minder code. You could look in the owners manual and decipher the code. You will probably find something like this:

B = Replace engine oil and oil filter; inspect brakes, hoses and lines; check parking brake adjustment; inspect tie rod ends, steering gear box, boots, suspension components, driveshaft boots, all fluid levels and condition of fluids, exhaust system, fuel lines and connections

1 = Rotate tires

3 = Replace transmission fluid (for A/T only)