Chassis, generic

C0168 Right Rear ABS Inlet Solenoid Circuit Malfunction

Check engine lightUsually off

EmissionsNot relevant

Drive cycleNot required

Limp modePossible

C0168 has no public trace: it is missing from the accessible J2012 tables, from the NHTSA bulletin index and from the manufacturer pages checked, where Saab for instance uses C2485 for the rear right valves. Taken at face value it covers the inlet solenoid of the right rear brake, which isolates that caliper from master cylinder pressure while the module regulates the wheel. Typical findings are a coil with an open winding, a short between coil and housing, or a corroded plug at the valve block. Toyota and Denso patented the self-test that checks each solenoid for these faults and then trips a cut-off relay, while MOTOR documents how the ATE module times test pulses per valve and shuts anti-lock down when one is wrong.

Likely causes

Open winding in the rear right inlet coil

Short between coil and housing

Corroded plug at the valve block

Symptoms

ABS lamp on, often directly at key-on
No anti-lock control on any wheel

Repair estimate

DifficultyHardWorkshop job

Parts and labour€400–1,500

Time1.5–4 h

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

Parts involved

abs hydraulic unitabs control modulesolenoid valve

Related codes

C0173 C0209

References: patents.google.com, motor.com, saabwisonline.com.