2010 BMW 750Li Rear Suspension Drop

2010 BMW 750LI
125,123 MILES • 5.0L • V8 • RWD • AUTOMATIC
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MB-POWER
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this car have dropped rear suspension (both sides), air compressor has been replaced but still same. after scanned we found following code: 480DB0 (raise control timed).

What we should check to find the problem to fix it?
your assistance please.
Thanks
Aug 29, 2017 at 1:05 AM
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STEVE W.
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Do you have the factory BMW INPA/EDIABAS software and vehicle interface? You will need that to run through the test schedule for the suspension system. Without it you are flying blind on a system that can make you nuts, even when it does work!

The code means the computer thinks it is taking excessive time for the suspension to get to the proper ride height.
I would start at the compressor and work my way back along the lines, a small leak or a bad valve could easily cause this. As could a bad height sensor.

If you have the correct software you can go in and look at the ride height the sensors are showing and reset it. If you change any of the sensors you will need the software to reset the system to match the new parts.
Aug 29, 2017 at 5:32 PM
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MB-POWER
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we have (Maxisys Elite).
Aug 29, 2017 at 9:33 PM
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STEVE W.
  • ✓Experienced Mechanic
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That should work. You should find a section in it that covers the suspension. It should have guided tests that you do to check the system piece by piece. On of those should be ride height. It reads the height the computer thinks the car is at and shows what it is set at. So if you go in there and it is showing a ride height of say six inches and the sensor is showing six inches but the car is on the bump stops you can tell the sensor is bad.
Aug 30, 2017 at 4:11 AM

Suggested Repair

Use Maxisys Elite or BMW INPA/EDIABAS guided suspension tests to compare commanded ride height with sensor readings. Inspect the compressor, air lines for small leaks, valves, and height sensors. Replace a faulty sensor only if readings do not match actual height, then reset the system with the software.

Conversation Summary

A 2010 BMW 750Li has both rear air springs dropped. The compressor was replaced, but fault 480DB0 (raise control timed) remains, meaning the system is taking too long to reach ride height. The expert advised using factory or capable scan software for guided tests, starting at the compressor and checking lines, valves, and height sensors, then resetting the system if sensors are replaced. The owner has a Maxisys Elite, which the expert said should support those tests.

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