Chassis, generic

C0019 Left Rear Outlet Control

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

Covers the left rear outlet (release) solenoid valve of the ABS hydraulic modulator, the release counterpart to inlet valve C0018. It opens to dump brake fluid from the left rear caliper or wheel cylinder into the low-pressure accumulator so pressure can fall during an ABS or stability cycle, then closes for reapply. The module monitors the coil circuit for opens, shorts and out-of-range resistance and verifies valve response. A confirmed fault disables ABS, traction and stability control and sets the ABS warning lamp while base hydraulic braking remains. No manufacturer documents this code publicly; the release valve per wheel appears in NHTSA's brake safety study and, normally closed, in a pump patent.

Likely causes

Outlet valve coil open or shorted
Harness or connector corrosion
Internal hydraulic modulator fault

Symptoms

  • ABS warning lamp on
  • ABS and stability control disabled
  • Normal braking retained

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€300–1,700
Time1.5–4 h

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

Parts involved

lr abs outlet valve

Related codes

C0018C001AC001D

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