What this code means

The ABS brake pressure accumulator has insufficient pressure to support ABS or traction control operations.

Symptoms

• ABS light on
• Brake pedal very firm
• Long pedal travel
• Traction control disabled
• Warning chime

Common causes

• Leaking accumulator
• Faulty ABS pump not building pressure
• Accumulator nitrogen charge depleted
• Internal hydraulic leak in modulator

Diagnostic steps

1. Check accumulator pressure with scan tool
2. Monitor pump run time and pressure build
3. Inspect for external brake fluid leaks
4. Test pump motor operation
5. Check for hydraulic unit internal leaks

Repair notes

Replace accumulator or ABS hydraulic unit. Bleed system thoroughly.

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