C0018Left Rear Inlet Control
- Generic OBD-II code · Chassis
- Can trigger limp mode
- How the car detects it
- Covers the left rear inlet (apply) solenoid valve of the ABS hydraulic modulator, the rear-axle counterpart of C0010. The module closes this valve to isolate the left rear brake circuit and hold wheel pressure during ABS, traction or stability control, then opens it to reapply pressure. On many vehicles the rear channel also carries electronic brake-force distribution. The module monitors the coil for opens, shorts to supply or ground and resistance outside the calibrated range. A confirmed electrical fault disables ABS and the stability functions and lights the ABS warning lamp while leaving base braking intact. No manufacturer documents this code publicly; NHTSA's brake safety study and a pump patent describe the per-wheel apply valve.
- What you may notice
- ABS warning lamp on
- ABS and stability control disabled
- Normal braking retained
- Likely causes
- LikelyInlet valve coil open or shorted
- PossibleHarness or connector corrosion
- RareInternal hydraulic modulator fault
- Repair
- Workshop only · Usually a job for a workshop.Typical cost: €300 – €1,700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.