Chassis, generic

C001E Right Rear Hydraulic Release Too Long

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

Set when the ABS modulator cannot release pressure at the right rear wheel within the expected time during a control cycle, completing the per-wheel set with C0012, C0016 and C001A. After commanding the right rear outlet valve to dump pressure the module expects wheel speed to recover and line pressure to fall; a release longer than the calibrated limit points to a sticking valve, a restricted hydraulic path or an accumulator or pump that cannot accept fluid. ABS and stability control are disabled and the ABS warning lamp is set. No manufacturer documents this code publicly; the release phase is covered by NHTSA's brake study, the accumulator limit by a patent on low-pressure accumulators.

Likely causes

Outlet valve sticking or slow
Restricted hydraulic path or contaminated fluid
Pump or accumulator cannot accept fluid

Symptoms

  • ABS warning lamp on
  • ABS and stability control disabled
  • Extended or firm pedal during hard braking

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€300–1,800
Time2–4 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

rr abs outlet valvehcu

Related codes

C001CC001DC001A

References: rosap.ntl.bts.gov, patents.google.com, en.wikipedia.org.