C1098: ABS Hydraulic Pump Motor Circuit Short To Battery

What does C1098 mean?

C1098 is a diagnostic trouble code indicating "ABS Hydraulic Pump Motor Circuit Short To Battery". The ECU is detecting a voltage reading that is below the expected range in the anti-lock brakes circuit. This typically points to a wiring short, a faulty sensor, or a grounding issue.

Symptoms you may notice

• Check engine light (MIL) illuminated on dashboard
• ABS warning light on
• Brake pedal feels different
• Unusual braking behaviour
• Intermittent warning lights

Common causes

• Damaged or corroded wiring harness
• Loose or disconnected electrical connector
• Failed anti-lock brakes sensor or actuator
• Blown fuse in the related circuit
• Poor ground connection

What should you do?

This code sits in the braking system. Your normal hydraulic brakes generally still work, but the electronics layered on top of them, ABS, EBD and emergency brake assist, can drop out. You will not notice until you brake hard or brake on a wet or loose surface, and that is the moment they would have helped. Treat the car as needing a workshop rather than as safe to drive, and get it looked at before your next real trip.