Airmatic - no faults/no sag - compressor runs a lot
Thread Starter
Newbie
Joined: Nov 2024
Posts: 13
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From: SC
2017 GLS450
Airmatic - no faults/no sag - compressor runs a lot
This site has been invaluable to me diagnosing issues but I can't find a solution to this one.
2017 GLS450, wife's car. Within last 12 months, I've installed new Arnott compressor, valve block and Bilstein rear bags (both sides). In the last month or so, I've noticed compressor switches on quite often, every few minutes or more, but no codes on dash. Scanned with my Foxwell bidirectional scanner and haven't gotten any faults repeating themselves, except for the y51-y54 damping valves "Not OK" on all 4 solenoid 1 valves (y1) and "Not OK" on both rear solenoid 2 valves (y2). I just changed valve block again and no change.
Some of the sporadic, non-repearting codes I've gotten in diagnosing it over the last month are:
C156B00 - time for filling compressed air reservoir exceeded.
C02A100 - Control unit 'N3014 (Electronic Stability Program control unit) has detected an overvoltage.
Any ideas what it could be? The car not sagging in any corners is really throwing me off. Even monitoring level sensors live data isn't helping, they all stay about the same except for the obvious bump compressing them momentarily.
Thanks for any advice in advance!
2017 GLS450, wife's car. Within last 12 months, I've installed new Arnott compressor, valve block and Bilstein rear bags (both sides). In the last month or so, I've noticed compressor switches on quite often, every few minutes or more, but no codes on dash. Scanned with my Foxwell bidirectional scanner and haven't gotten any faults repeating themselves, except for the y51-y54 damping valves "Not OK" on all 4 solenoid 1 valves (y1) and "Not OK" on both rear solenoid 2 valves (y2). I just changed valve block again and no change.
Some of the sporadic, non-repearting codes I've gotten in diagnosing it over the last month are:
C156B00 - time for filling compressed air reservoir exceeded.
C02A100 - Control unit 'N3014 (Electronic Stability Program control unit) has detected an overvoltage.
Any ideas what it could be? The car not sagging in any corners is really throwing me off. Even monitoring level sensors live data isn't helping, they all stay about the same except for the obvious bump compressing them momentarily.
Thanks for any advice in advance!
Super Member
Joined: Jul 2019
Posts: 733
Likes: 297
From: New Orleans
2014 GL450, 1992 W140 300SD, 1993 W140 300SE, 1987 E30 Convertible
Your compressor is wearing itself out. That is a code for time for filling. If it runs too much means there is an air leak. Only way to chase it either spray all air connections with soapy water or give a car a time to set for a week and see is there is a drop in height in any corner.
Thread Starter
Newbie
Joined: Nov 2024
Posts: 13
Likes: 0
From: SC
2017 GLS450
Your compressor is wearing itself out. That is a code for time for filling. If it runs too much means there is an air leak. Only way to chase it either spray all air connections with soapy water or give a car a time to set for a week and see is there is a drop in height in any corner.
I agree on compressor wear, hence my concern. I've sprayed everything around the compressor and valve block with no luck. I'll check individual connections on all 4 corners and reservoir today to see if there's any indicators. The weird part, to me, is there hasn't been anything on the dash, just the scanner. Figured it has to be something else due to all 4 solenoid 1 valves showing "Not OK."
I did read yesterday in one of the W model forums that some people have had airmatic issues when their aux battery was dying and needing replacement. Anyone else ever heard of this being a contributing factor?
Thread Starter
Newbie
Joined: Nov 2024
Posts: 13
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From: SC
2017 GLS450
So it was just the pump the whole time? No sagging of the suspension, just running too much? Replacing the compressor fixed the running too often issue?
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Joined: Jun 2021
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From: Fleriduh
W212 E63S Wagon - GSL580 - E63 - E350 - C300
Yes, for me it was the pump. If I recall it was take of the PS front wheel, remove the spash guard, inside the splashguard mounted to four rubberized mounts sits the pump.
MBWorld Fanatic!
Joined: Jun 2021
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From: Fleriduh
W212 E63S Wagon - GSL580 - E63 - E350 - C300
Thought more - on RARE occasion I would get a "pump over heating message". Only on a hot hot day...and, if I tried to lift the car into Off Road mode (the one wtih the 12mph limit)
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Thread Starter
Newbie
Joined: Nov 2024
Posts: 13
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From: SC
2017 GLS450
Edit: if the pump is leaking somewhere internally, perhaps system pressure isn't sufficient for an "OK" status on valve solenoids 🤔
Last edited by QuackQuackBlast; Nov 7, 2024 at 03:32 PM.
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