C055EBrake Hydraulic Circuit A Leak
- Generic OBD-II code · Chassis
- Turns on the check-engine light
- Can trigger limp mode
- How the car detects it
- C055E reports a leak in hydraulic circuit A, the counterpart of C055D. Land Rover documents it on the Defender L663 from 2020 as C055E-7A, meaning lost fluid or a failed seal, with amber ABS and DSC lamps. By design the code survives a simple clear: after the repair the ignition is cycled until the car sleeps, switched on again, left 15 s without touching the pedal, then the pedal is held firmly for up to 120 s while the valves click through a self-check (SSM 74988). If lamps stay lit, the leak is still there. GM's 2025 EBCM tables list C055E for the second circuit with the same leakage limits as C055D and Type A MIL. Driving on is risky, because only one circuit may be braking.
- What you may notice
- Amber ABS and DSC/ESC lamps, possibly red brake warning
- Longer pedal travel or spongy feel
- Warning returns after clearing until the self-check passes
- Likely causes
- LikelyFluid escaping from a line, hose, union or caliper of circuit A
- PossibleInternal seal failure in master cylinder or hydraulic unit
- PossibleRepair done but the required self-check was not completed, so the code stays
- RareAir trapped after bleeding or component replacement
- Repair
- Hard · Usually a job for a workshop.Typical cost: €60 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.