Chassis, generic

C0915 Active Roll Stabilisation Front Actuator Circuit

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

No list, bulletin or manual shows C0915 in use; the NHTSA index only matches unrelated BMW document numbers. The title names the front actuator of active roll control, which splits the anti-roll bar and twists its halves against each other to hold the body level in bends and to decouple them on rough roads. Schaeffler's 48 V design for the Audi SQ7 front axle drives this with a brushless motor and a three-stage planetary gearbox, up to about 30 degrees of twist and 850-1200 Nm; ZF quotes up to 1400 Nm. A circuit fault concerns motor or sensor wiring between actuator and control unit. Audi's Q7/Q8 family logs control unit faults as C129700 at addresses 00D4/00D5, while Land Rover's older hydraulic system used C1119 and needed bleeding.

Likely causes

Damaged plug or harness at the front stabiliser actuator
Actuator motor or internal sensor failed
Fault in the 48 V supply feeding the actuator

Symptoms

  • Suspension or roll stabilisation warning
  • Noticeably more body lean in corners

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€200–3,500
Time1–6 h

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

Parts involved

roll stabilisation actuator frontroll stabilisation module

Related codes

C0916C0920

References: schaeffler.com, zf.com, static.nhtsa.gov, static.nhtsa.gov.