diff --git a/lib/rp.js b/lib/rp.js
index cc51d1a..7736f61 100644
--- a/lib/rp.js
+++ b/lib/rp.js
@@ -61,9 +61,24 @@ function RP$callback(err, response, body) {
 
     } else if (self._rp_options.simple && !(/^2/.test('' + response.statusCode))) {
 
-        self._rp_reject(new errors.StatusCodeError(response.statusCode, body, self._rp_options, response));
+        if (isFunction(self._rp_options.transform)) {
+
+            (new Bluebird(function (resolve) {
+                resolve(self._rp_options.transform(body, response, self._rp_options.resolveWithFullResponse)); // transform may return a Promise
+            }))
+                .then(function (transformedResponse) {
+                    self._rp_reject(new errors.StatusCodeError(response.statusCode, body, self._rp_options, transformedResponse));
+                })
+                .catch(function (err) {
+                    self._rp_reject(new errors.TransformError(err, self._rp_options, response));
+                });
+
+        } else {
+            self._rp_reject(new errors.StatusCodeError(response.statusCode, body, self._rp_options, response));
+        }
 
     } else {
+
         if (isFunction(self._rp_options.transform)) {
             try {
                 self._rp_resolve(self._rp_options.transform(body, response, self._rp_options.resolveWithFullResponse));
@@ -75,6 +90,7 @@ function RP$callback(err, response, body) {
         } else {
             self._rp_resolve(body);
         }
+
     }
 
     if (origCallbackThrewException) {
diff --git a/test/spec/request-test.js b/test/spec/request-test.js
index 39f9907..1cbd074 100644
--- a/test/spec/request-test.js
+++ b/test/spec/request-test.js
@@ -421,6 +421,173 @@ describe('Request-Promise', function () {
 
         });
 
+        describe('on non-200 responses in simple mode', function () {
+
+            it('that processes the body', function () {
+
+                var options = {
+                    url: 'http://localhost:4000/404',
+                    transform: function (body) {
+                        return body.split('').reverse().join('');
+                    }
+                };
+
+                return rp(options)
+                    .then(function () {
+                        throw new Error('Request should not have been fulfilled!');
+                    })
+                    .catch(function (err) {
+                        expect(err.response).to.eql('404/ TEG');
+                    });
+
+            });
+
+            it('that processes the full response', function () {
+
+                var options = {
+                    url: 'http://localhost:4000/404',
+                    transform: function (body, httpResponse) {
+                        return httpResponse.body.split('').reverse().join('');
+                    }
+                };
+
+                return rp(options)
+                    .then(function () {
+                        throw new Error('Request should not have been fulfilled!');
+                    })
+                    .catch(function (err) {
+                        expect(err.response).to.eql('404/ TEG');
+                    });
+
+            });
+
+            it('that returns a promise', function () {
+
+                var options = {
+                    url: 'http://localhost:4000/404',
+                    transform: function (body) {
+                        return new Bluebird(function (resolve) {
+                            setTimeout(function () {
+                                resolve(body.split('').reverse().join(''));
+                            });
+                        });
+                    }
+                };
+
+                return rp(options)
+                    .then(function () {
+                        throw new Error('Request should not have been fulfilled!');
+                    })
+                    .catch(function (err) {
+                        expect(err.response).to.eql('404/ TEG');
+                    });
+
+            });
+
+            it('that returns a rejected promise', function () {
+
+                var options = {
+                    url: 'http://localhost:4000/404',
+                    transform: function (body) {
+                        return new Bluebird(function (resolve, reject) {
+                            setTimeout(function () {
+                                reject(new Error('Transform rejected!'));
+                            });
+                        });
+                    }
+                };
+
+                return expect(rp(options)).to.be.rejected;
+
+            });
+
+            it('that throws an exception', function () {
+
+                var cause = new Error('Transform failed!');
+
+                var options = {
+                    url: 'http://localhost:4000/404',
+                    transform: function (body) {
+                        throw cause;
+                    }
+                };
+
+                var expectedOptions = {
+                    url: 'http://localhost:4000/404',
+                    simple: true,
+                    resolveWithFullResponse: false,
+                    transform: options.transform
+                };
+
+                return rp(options)
+                    .then(function () {
+                        throw new Error('Request should not have been fulfilled!');
+                    })
+                    .catch(function (err) {
+                        expect(err instanceof errors.TransformError).to.eql(true);
+                        expect(err.name).to.eql('TransformError');
+                        expect(err.message).to.eql('Error: Transform failed!');
+                        expect(err.cause).to.eql(cause);
+                        expect(err.error).to.eql(cause);
+                        delete err.options.callback; // Even out Request version differences.
+                        expect(err.options).to.eql(expectedOptions);
+                        expect(err.response).to.be.an('object');
+                        expect(err.response.body).to.eql('GET /404');
+                        expect(err.response.statusCode).to.eql(404);
+                    });
+
+            });
+
+            it('not if options.transform is not a function', function () {
+
+                var options = {
+                    url: 'http://localhost:4000/404',
+                    transform: {}
+                };
+
+                return rp(options)
+                    .then(function () {
+                        throw new Error('Request should not have been fulfilled!');
+                    })
+                    .catch(function (err) {
+                        expect(err.response.body).to.eql('GET /404');
+                    });
+
+            });
+
+            it('for HEAD by default', function () {
+
+                return rp.head('http://localhost:4000/404')
+                    .then(function () {
+                        throw new Error('Request should not have been fulfilled!');
+                    })
+                    .catch(function (err) {
+                        expect(err.response['content-type']).to.eql('text/plain');
+                    });
+
+            });
+
+            it('but still letting to overwrite the default transform for HEAD', function () {
+
+                var options = {
+                    url: 'http://localhost:4000/404',
+                    transform: function () {
+                        return 'test';
+                    }
+                };
+
+                return rp.head(options)
+                    .then(function () {
+                        throw new Error('Request should not have been fulfilled!');
+                    })
+                    .catch(function (err) {
+                        expect(err.response).to.eql('test');
+                    });
+
+            });
+
+        });
+
     });
 
     describe('should cover the HTTP method shortcuts', function () {