diff --git a/Lib/subprocess.py b/Lib/subprocess.py
--- a/Lib/subprocess.py
+++ b/Lib/subprocess.py
@@ -934,18 +934,18 @@ class Popen(object):
                 errread = msvcrt.open_osfhandle(errread.Detach(), 0)
 
         if p2cwrite != -1:
-            self.stdin = io.open(p2cwrite, 'wb', bufsize)
+            self.stdin = io.open(p2cwrite, 'wb', bufsize, errors="surrogateescape")
             if universal_newlines:
                 self.stdin = io.TextIOWrapper(self.stdin, write_through=True,
                                               line_buffering=(bufsize == 1))
         if c2pread != -1:
             self.stdout = io.open(c2pread, 'rb', bufsize)
             if universal_newlines:
-                self.stdout = io.TextIOWrapper(self.stdout)
+                self.stdout = io.TextIOWrapper(self.stdout, errors="surrogateescape")
         if errread != -1:
             self.stderr = io.open(errread, 'rb', bufsize)
             if universal_newlines:
-                self.stderr = io.TextIOWrapper(self.stderr)
+                self.stderr = io.TextIOWrapper(self.stderr, errors="surrogateescape")
 
         self._closed_child_pipe_fds = False
         try: