C1097 indicates the ABS (Anti-lock Braking System) control module has detected a short-to-ground fault in the hydraulic pump motor circuit. The pump motor is responsible for generating hydraulic pressure needed for ABS function.
The pump motor winding has internally shorted to ground, most commonly due to wear, age, or contamination. This is the most frequent cause of this code.
The wiring harness or connector to the pump motor has been damaged, chafed, or corroded, allowing the circuit to short to ground.
The fuse powering the ABS pump motor has blown, or the pump relay has failed, causing abnormal circuit conditions.
The ground connection for the ABS pump motor is corroded, loose, or damaged, causing the circuit to find alternate ground paths.
The complete ABS hydraulic assembly (which includes the pump, valves, and control module) has failed internally, though this is less common than isolated pump failure.
The ABS electronic control module itself has failed and is incorrectly reporting a short-to-ground. This is a rare cause and should be diagnosed after other possibilities are ruled out.
Yes, standard braking will continue to function, but the anti-lock feature will be disabled. You should drive cautiously and have the system diagnosed promptly.
No. While some shops may suggest replacing the PCM/ECM for this code, it is almost never the culprit. The fault is almost always in the pump motor, wiring, or related electrical components.
Often yes, because many vehicles have the pump motor integrated into the hydraulic assembly. However, on some vehicles the motor is serviceable separately. Check your specific vehicle's repair options before assuming full replacement is needed.
Low voltage can contribute to electrical faults and may trigger false codes, but it would not typically cause a true short-to-ground in the pump motor circuit. Address any severe battery or charging system issues, but the underlying cause is usually a physical short or component failure.