Ionic 2 ion-select forControlName error


I’m using formbuilder in ionic 2 but facing problems with the ion-select directive when using formControlName with it.
All the data is being forwarded to firebase where these values are being set.

here’s an extract from the html

<ion-item fromGroupName="carDetails">
          <ion-label floating>car make</ion-label>
          <ion-select #carMake (change)="elementChanged(carMake)" formControlName="carMake">
            <ion-option value="ford" selected>Ford</ion-option>
            <ion-option value="bmw">BMW</ion-option>
            <ion-option value="mercedes">Mercedes</ion-option>

<ion-item formGroupName="carDetails">
          <ion-label floating>car model</ion-label>
          <ion-input #carModel formControlName="carModel" type="text" (change)="elementChanged(carModel)"
          [class.invalid]="!slideTwoForm.controls.carDetails.controls.carModel.valid && (carModelChanged || submitAttempt)"></ion-input>
        <ion-item *ngIf="!slideTwoForm.controls.carDetails.controls.carModel.valid  && (carModelChanged || submitAttempt)">
          <p>Please enter a valid car model.</p>

<ion-item formGroupName="carDetails">
          <ion-label floating>car year</ion-label>
          <ion-datetime #carYear formControlName="carYear" displayFormat="YYYY" (change)="elementChanged(carYear)" ngControl="carYear"></ion-datetime>

and here’s an extract from the .ts file

this.slideTwoForm ={
    ssn: ['', Validators.compose([Validators.maxLength(11), Validators.pattern('[0-9]*'), Validators.required])],
      drivingLicense: [''],
      expirationDate: [''],
      carMake: [''],
      carModel: [''],
      carYear: [''],
      carColor: [''],
    password: ['', Validators.compose([Validators.minLength(6), Validators.required])]

Now, the “carModel” and “carYear” are working flawlessly and sending their value when using “formControlName”, but “carMake” is giving an error when using “formControlName”, the error:

 polyfills.js:3 Uncaught ViewWrappedError {_nativeError: Error: Error in ./SignUpPage class SignUpPage - inline template:134:70 caused by: Cannot find contro…, originalError: Error: Cannot find control with name: 'carMake'
at _throwError (http://localhost:8100/build/main…, context: DebugContext}

I tried using ngControl instead of formControlName but the values are empty.
did anyone else faced problems like this when sing ion-select in ionic 2 formbuilder?