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C1098 Manufacturer-specific Basic entry

ABS Hydraulic Pump Motor Circuit Short To Battery

Updated 2026-10-02 · Chassis (manufacturer-specific)

Severity
High
Typical repair cost
40 – 350 EUR
System
Chassis

This is a manufacturer-specific code. Its exact meaning can differ between makes; the definition below follows the most common usage.

What it means

C1098 is stored when the chassis control module (ABS/ESP) measures a voltage in the ABS Hydraulic Pump Motor circuit above the expected maximum, typically because the signal wire is shorted to battery voltage or the circuit is open and pulled up internally.

This entry is compiled automatically from the standard definition and typical diagnostic practice for this type of fault. A detailed, reviewed article is in preparation.

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Symptoms

  • ABS, ESP or traction control warning light
  • Stability and traction systems disabled
  • Possible longer braking distance in emergency stops
  • Speedometer or cruise control affected in some vehicles

Common causes

  1. Damaged, chafed or corroded wiring in the ABS Hydraulic Pump Motor circuit
  2. Corroded, loose or water-damaged connector terminals
  3. Failed ABS Hydraulic Pump Motor component (sensor, solenoid or actuator)
  4. Poor ground connection for the module or component
  5. Faulty control module driver (rare, confirm all else first)

How to diagnose

  1. Read freeze frame data and note when the code set (cold start, under load, after rain)
  2. Inspect the ABS Hydraulic Pump Motor connector for bent pins, corrosion and water; wiggle the harness with the engine running and watch live data
  3. Measure supply voltage and ground at the connector with the key on
  4. Check the signal wire for shorts to ground or battery and for continuity to the control module
  5. Test or substitute the ABS Hydraulic Pump Motor only after wiring and connectors are confirmed good
  6. Clear the code and complete a drive cycle to confirm the repair

Frequently asked questions

Can I keep driving with C1098?

Not for long. This code can lead to expensive follow-up damage or affects safety systems; have it checked as soon as possible.

Will clearing C1098 fix it?

No. Clearing only erases the stored code; it returns as soon as the monitor runs again unless the cause is repaired.

Related codes

C1095C1096C1097

Nearby codes in this group