NO - you would have to change valve out
the diverter knob is either stripped or the diverter itself itself may be broken turn the water supply off take the knob off a carefully remove the diverter shaft if the flapper is missing look inside the housing for the broken piece then take the name and model down to home depot or similar home store and someone will be able to match it up,. but my money is on the stripped knob
depending on your spout diverter if its a valve or is it on the spout it self, if the diverter is on the spout then your diverter is not letting full flow of water out of the spout and its putting enough pressure to allow the water out of the shower head, I had this problem before and if you change the spout it should fix the problem. If you have a 3 way valve which is on the wall then i would suggest replaceing the parts in that valve if possible other wise change out the divert valve. If your broke like me and want a cheap fix then put either a water flow resistor or a shutoff right before your shower head.
Gravity. The shower head is probably 4 or 5 feet higher than the bath tap.
it blocks the water from coming out of the spout & redirects it to a different exit point
Put a wash cloth or similar over the end and use a pipe wrench or slip joint pliers. The cloth keeps the wrench from scratching the surface of the spout.
Clean the diverter as sediment may be causing the problem
A hole has developed in the spout or where it screws onto the pipe needs more Teflon tape or joint compound to seal the threads.
Most likely you have a bad diverter valve. If you have a shower valve, turn the house water off, remove the diverter handle and the escutcheon plate. Remove the diverter valve-many different ways- clips, screws etc-check to see it it is clogged, , washer or cartridge damaged etc. Go to a plumbing supply house and get a repair kit or a new valve, re-install, turn on the water and check for leaks before putting back the plate. If you only have a lift handle on the tub spigot, the lift handle is stuck or the diverter plate is stuck. Screw off the old spout, get a replacement and re-install after taping the joint. These can be changed without turning off the water. Sometimes they are so corroded you will have to CAREFULLY saw through the spout and split it off the tub stubuot
Depending where is has broken off, depends to what extent of how much you will have to replace, but worse case scenario is, inside there is a cartridge that has a little lever that the diverter handle attaches too. This whole cartridge needs to be replaced. Depending on the make, it can be costly.
Your tub spout isn't fully diverting the water to the shower head and a very small amount is leaking through. The smaller the hole the water has to exit, the greater the pressure. Replace the tub spout, usually costs less than 20 dollars.
showerThe Bath uses a lot more as the tub spout does NOT have a flow restrictor