C001ALeft Rear Hydraulic Release Too Long
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- Set when the ABS modulator cannot release pressure at the left rear wheel within the expected time during a control cycle, the left rear equivalent of C0012 and C0016. After the module commands the left rear outlet valve to dump pressure it expects wheel speed to recover and line pressure to fall; a release that exceeds the calibrated time limit indicates a sticking valve, a restricted hydraulic path or an accumulator or pump unable to accept fluid. ABS and stability control are disabled and the ABS warning lamp is set. No manufacturer documents this code publicly; NHTSA's study covers the release step of the ABS cycle, and a patent shows how a full low-pressure accumulator slows it.
- What you may notice
- ABS warning lamp on
- ABS and stability control disabled
- Extended or firm pedal during hard braking
- Likely causes
- LikelyOutlet valve sticking or slow
- PossibleRestricted hydraulic path or contaminated fluid
- RarePump or accumulator cannot accept fluid
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €300 – €1,800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.