Grand Cherokee Air Suspension Calibration

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After recently replacing the elbow joiners for the front air suspension (leaking), I kept getting a Calibrate Air Suspension error and it was slow trying to raise and lower and would time out.

This was just before replacing the elbows, overnight the front dropped..

Once the leaking elbows were replaced, the error of Ride Height Calibration started showing up on the screen and in AlfaOBD

Found in AlfaOBD scan tool the suspension calibration section, but it required you to enter the Curb Height measurements for each corner of the vehicle. That had me stumped for a while as I could not find this info anywhere.

A few weeks later I finally found it… It’s simply the wheel centre to ground minus a cradle bolt to ground. Comes.out at around the 85 to 95mm mark. Once you have these, connect with AlfaOBD, jump onto the air suspension section, go to the Calibration section, start the calibration and enter these values in. This document will give you the method.for measuring.

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4 Responses

  1. John Crocombe says:

    When you replaced the leaking elbow joiners for the front air suspension, did you replace them with a brass fitting, or more plastic items?

    • Dave says:

      Hey John, I replaced them with plastic ones from eBay. I figured since it was the O-rings inside that seal against the tube leaking that the problem was not that they were plastic. I believe the rubber deteriorates from the dust and heat under the bonnet. The rears have the same fitting but rarely do you hear of any issues with them as they are inside the rear quarter panels, no heat and very little dust in comparison.

  2. Jose says:

    Yo tengo Alfaobd, Realice paso a paso el procedimiento y cuando llege a la parte de calibración no me permite escribir los valores. Me estoy volviendo loco, ya tengo 6 meses detenido en mi cochera.

    I have Alfaobd, I carried out the procedure step by step and when I get to the calibration part it does not allow me to write the values. I’m going crazy, I’ve been sitting in my garage for 6 months now.

    • Dave says:

      Hi Jose,

      I didnt have any issues, but i did notice it had to be done relatively quickly or it failed. So I calculated all the figures for each corner and wrote them down, making sure they are in the 80 to 90 mm range as thats what is expected. Once done I did have to exit and go back in and clear errors, apparently thats normal as the suspension system errors out when its taken offline to calibrate.

      I will be home in 2 weeks and I am going to reset mine again on my flat garage floor as I have only done the measurements on the side of the road which was not very level. They also recommend doing it at least twice so it sets itself to the correct levels. I think mine is a little bit high still at normal.

      Hola, José,

      No tuve ningún problema, pero sí noté que tenía que hacerlo relativamente rápido o fallaba. Así que calculé todas las cifras para cada esquina y las anoté, asegurándome de que estuvieran en el rango de 80 a 90 mm, ya que eso es lo que se esperaba. Una vez hecho esto, tuve que salir y volver a entrar y borrar los errores, aparentemente eso es normal ya que el sistema de suspensión falla cuando se desconecta para calibrarlo.

      Estaré en casa en 2 semanas y voy a restablecer el mío nuevamente en el piso de mi garaje, ya que solo hice las mediciones en el costado de la carretera que no estaba muy nivelado. También recomiendan hacerlo al menos dos veces para que se ajuste a los niveles correctos. Creo que el mío está un poco alto todavía en estado normal.

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