ABS Module Lab
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C0550

ABS / stability-control fault code, listed for 4 vehicle lines from Chevrolet. What it means on each one, with sources, and when the module is the cause.

What C0550 means

Is it the ABS module?

Check the cheap things first: battery voltage and the main fuses for the ABS pump and module, the ground straps, the module connector (corrosion, a pushed-back pin) and, for wheel-speed codes, the sensor and its wiring at each wheel. If those are good and the code returns as soon as it is cleared — or the scan tool cannot talk to the ABS module at all — the module itself is the likely cause, and that is what we repair.

Vehicles that set C0550

C0550 by vehicle

What does C0550 mean on a Chevrolet Equinox (second generation)?

The source we cite for the 2010-2017 Chevrolet Equinox (second generation) lists it as: Electronic Control Unit Performance (same a rebuilder page). That vehicle uses ATE (Continental) MK61 (a rebuilder wording, 2012-2017 Equinox); a rebuilder says the GM EBCM on 2012-2018 Equinox/Terrain is 'built by ATE' (bo. We repair it as part of the ATE / Continental MK60 / MK61 family, from $499.

What does C0550 mean on a Chevrolet Impala (W-body 2006-2013, incl. 2014-2016 Impala Limited)?

The source we cite for the 2006-2016 Chevrolet Impala (W-body 2006-2013, incl. 2014-2016 Impala Limited) lists it as: Internal fault code (a rebuilder wording). That vehicle uses TRW EBC-440. We repair it as part of the TRW EBC 345 / 440 / 450 family, from $499.

What does C0550 mean on a Chevrolet Malibu (Epsilon, 2008-2012)?

The source we cite for the 2008-2012 Chevrolet Malibu (Epsilon, 2008-2012) lists it as: Internal failure code (a rebuilder wording). That vehicle uses TRW EBC-440. We repair it as part of the TRW EBC 345 / 440 / 450 family, from $499.

What does C0550 mean on a Chevrolet Silverado 2500HD / 3500HD (GMT900)?

The source we cite for the 2007-2014 Chevrolet Silverado 2500HD / 3500HD (GMT900) lists it as: Internal fault code (a rebuilder wording: 'Internal Fault Code'; standard GM definition 'Electronic Control Unit (Performance)'). That vehicle uses TRW EBC-345 (trucks WITHOUT RPO JL4 Active Brake Control) / EBC-440 (trucks WITH JL4 Active Brake Control). We repair it as part of the TRW EBC 345 / 440 / 450 family, from $499.

Still not sure?

Send us C0550, a photo of the module label and your VIN — we tell you whether the module is the likely cause and what it costs, before you pull anything. Asking costs nothing.

Ask First — Send a Label PhotoStart My Repair — from $499

C0550 keeps coming back after the checks? Fix the module — from $499.

Look up your part number and order online — we email you a prepaid label to our lab. Or send us a photo of the label and your VIN first, and we'll tell you what you have and what it costs.

Back with your VIN and coding · can’t be repaired? repair price back, minus shipping · 1-year warranty · rush 2–3 days +$100

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Call (817) 505-4201 · 📱 Text us a photo of the module label · Ask first — send a label photo · Email repairs@absmodulelab.com