C0550: Electronic control unit malfunction (Chassis / ABS)
Drive carefully. Get it checked within a week or two.
Can I drive with C0550?
Yes, but drive carefully and get it checked soon. Brake control module internal microprocessor error; ABS disabled, standard brakes work.
What does C0550 mean?
C0550 stands for Electronic Control Unit (ECU) Malfunction (Brake Control Module).
Symptoms you may notice
- ABS, Traction Control, and StabiliTrak warning lights illuminated
- Anti-lock pulse disabled during wet or panic stops (normal brakes work)
- Cruise control disabled by brake safety interlock
How much does it cost to fix?
Repair costs for code C0550 depend on the specific underlying root cause, ranging from simple DIY checks to component replacement. The table below lists the most common causes and rough price ranges in USD:
- Failed solder joint inside ABS electronic module (EBCM)
- Low battery voltage during startup
- Corroded main ABS power or ground wire
- Hydraulic pump motor internal short
What to do next
- Check main ABS 50A/60A fuses and ground wire on the frame.
- Have the ABS module rebuilt or replaced.
- Clear codes and test drive.
Last updated: October 2026
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General guidance only, not a professional diagnosis. If the check-engine light is flashing, or the car is running rough, overheating or losing power, stop driving and get help.
About this code
Code C0550 is an internal electronic fault inside the electronic brake control module. Cold solder joints on the module circuit board are common on GM and European cars. The car can be driven safely, but ABS will not engage during panic stops.