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Hi everyone, I’m new here I have a Mercedes glc 250d 2016 (W253) with an Airmatic fault
I’ve tried to connect through Xentry but I can not connect to the Airmatic module it comes up with the fault internal error so I was wondering could this be a software issue Due to having other codes relating to the airmatic module not communicating with other parts of the car I have checked all the fuses and bought a new relay from Mercedes.
I’ve tried to use DTS Monaco but I have no clue what I’m doing with that software so I left it alone.
Parts referenced: Relay A000 982 81 27 | N51/3 module A 253 900 88 00 | Compressor 0993200004
I’m posting this to help anyone diagnosing an AIRMATIC fault where the car shows suspension malfunction and Xentry reports the control unit as an internal fault / boot variant.
Car had:
AIRMATIC suspension fault on dash
In Xentry, the N51/3 Air Body Control module showed as an internal fault
Module status kept showing SPC213 boot variant
If I unplugged the module, the car wouldn’t see it at all
When plugged back in, it reappeared but still showed internal fault + boot variant
At first I assumed it would be a simple leak, fuse, or compressor issue, but it ended up being software/firmware in the N51/3 module.
What I checked (and what I replaced)
1) Compressor test
I powered the compressor directly with 12V and it ran, but because the car is around 10 years old, I still replaced the compressor for peace of mind.
Compressor part number: 0993200004
2) Relay in engine bay
In the left side of the engine bay, there’s a relay associated with the AIRMATIC system. I replaced it with genuine Mercedes to rule it out.
Relay part number: A000 982 81 27
Result: No change (still fault / no operation)
3) Accessed the N51/3 module (UK RHD car)
Removed the passenger seat, lifted the carpet, found the module underneath.
Checked for water ingress/corrosion: clean
Opened the module casing and inspected the board: nothing visibly burnt
Plugged it back in: still internal fault + SPC213 boot variant
Control module part number: A 253 900 88 00
4) Battery / wiring checks
I also ruled out voltage and wiring issues (including replacing the battery due to a warning light), but it didn’t change anything.
The actual fix
Because Xentry kept showing SPC213 boot variant and the module reported an internal fault, I suspected corrupted firmware/software rather than a dead ECU.
I contacted someone who could remote in and work through DTS Monaco. After about 25 minutes of reflashing/recoding:
The AIRMATIC button lit up red
Cluster displayed “Raising”
Suspension started operating normally again
Final conclusion: the module didn’t need replacing, it just needed a proper reflash/recode.
Quick advice if you’re seeing the same thing
Do the basics first (air leaks, compressor power, fuses/relay, power/ground, water ingress).
If your N51/3 (A 253 900 88 00) reports internal fault and SPC213 boot variant, don’t instantly bin it, it can be recoverable with a reflashed.
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