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Old 12-04-2021, 11:21 AM   #1
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2021 Tiffin Allegro Bus 35CP "Check Suspension" error

We have a yellow triangle with exclamation point that only says "Check Suspension" on the dash after picking it up from Cummins getting warranty work to replace a leaking rear main seal. I have been calling around and no one can tell us what this means. My wife worked with Tiffin in the dash interface and they came up with nothing. Anyone out there have a clue what this error may mean? I unscientifically checked the ride height and it looks good on all 4 corners and the tire to fender clearance seems fine on level ground and it rides and drives fine. I was hoping to get some ideas on what else to check since our local dealer is not returning calls.

Thanks!
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Old 12-04-2021, 11:40 AM   #2
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Could just be a bad sensor.
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Old 12-04-2021, 12:26 PM   #3
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Old troubleshooting concept - look first at last touched. Maybe a sensor cable was removed during the seal leak repair and not replaced. Maybe a component is not responding as the programming expects. No knowledge, just a thought. Pat
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Old 12-04-2021, 12:28 PM   #4
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Depending on what the Cummins dealer did. They might have jacked up the bus on the frame and extended the suspension beyond normal. I would check the ride height adjuster on that wheel. If all looks good, try a reset by shutting down all batteries for a few minutes.
Once we had a Cummins dealer work on an electrical problem. They had the bus for several days and must have turned the batteries on and off multiple times. By the time I got the bust back the Valid Air system was all messed up and had to be reset.
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Old 12-04-2021, 03:21 PM   #5
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Thanks everyone!
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Old 12-04-2021, 06:18 PM   #6
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I know exactly what happen because I inadvertently cause the same error message to appear on our 35cp. It happened when I turned the key to start as if I was in my suv without waiting for the required time…oops. The check suspension message appeared soon after I properly re-started the coach. Apparently the solenoids didn’t properly pass the initialization check because I jumped the gun at startup. Anyway, I was able to clear the error message and haven’t seen it since. So I suspect the tech at your dealer made the same bonehead mistake I made.
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