Code C1098 indicates that the ABS control module has detected an electrical short circuit to battery voltage within the hydraulic pump motor circuit. This prevents the pump from operating correctly, disabling the active braking assistance system.
An internal short circuit within the pump motor windings can cause the module to detect an abnormal voltage state.
Chafed or damaged wiring may cause the pump motor power wire to short to another voltage source or the battery line.
Moisture and corrosion at the pump motor connector can create conductive bridges, leading to electrical shorts.
A sticking or internally failed relay may provide improper voltage or create a short circuit condition.
An internal hardware failure within the control module's driver circuit may incorrectly report a short.
The vehicle is drivable and standard hydraulic braking remains functional, but the ABS system is disabled, which significantly increases stopping distances on slippery surfaces.
Not necessarily. While the pump motor is often integrated into the assembly, the fault could be located in a relay or a section of the wiring harness.
No. It is much more common for the pump motor or the wiring to fail than the control module. The module should only be replaced after the motor and wiring have been thoroughly tested and ruled out.