Chassis, generic

C0156 Right Front ABS Outlet Solenoid Circuit

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

C0156 completes the Saab/GM group of four and is likewise absent from the accessible J2012 tables. Saab lists it as the right pressure-reduction valve for the 9-3/9-5 with Bosch 5.3 traction control and as the right pressure relief valve in the 9-5 ESP; GM's PIP5094 keyword list names the code, and AA1Car's GM-based table gives Right TCS Solenoid #2. Reading it as the right front outlet valve fits its task of releasing pressure from that circuit after a traction or ABS intervention. Saab's fault page ends, after the wiring and actuator checks, with replacing the control module, since the coils are tied to the electronic unit. Until then the car brakes normally but without ABS, TCS or ESP support.

Likely causes

Open or shorted coil of the right pressure-reduction valve
Fault inside the control unit carrying the valve coils
Moisture or corrosion at the control unit connector

Symptoms

  • ABS, brake and TCS/ESP OFF lamps on
  • Wheels may lock under emergency braking

Repair estimate

DifficultyHardWorkshop job
Parts and labour€300–1,500
Time1–4 h

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

Parts involved

abs outlet solenoidabs hydraulic unitabs control module

Related codes

C0151C0146C0203

References: saabwisonline.com, saabwisonline.com, static.nhtsa.gov, aa1car.com.