Fault code C1095 – a step-by-step guide to diagnosing and fixing it

Error code C1095 is displayed and the check engine light is on - what does this mean?

The DTC C1095 is recognized by the OBD system and indicates a fault in the ABS hydraulic block or in the electronic control unit. This fault code mainly affects the anti-lock braking system and can have slightly different meanings for different manufacturers, but generally refers to internal hydraulic problems in the ABS system.

What causes can this error code have?

• Defective ABS hydraulic block
• Damaged ABS control unit
• Loose or corroded plug connections on the ABS module
• Defective hydraulic pump in the ABS system
• Blocked hydraulic lines
• Worn seals in the hydraulic block
• Electrical short circuits in the ABS wiring
• Low brake fluid level
• Contaminated brake fluid

What symptoms occur in parallel with fault code C1095?

• ABS warning light: The ABS indicator light in the dashboard lights up continuously
• Loss of ABS function: The anti-lock braking system no longer functions properly
• Changed brake characteristics: The brake pedal feels different or has a different pressure point
• Pumping noises: Unusual noises from the engine compartment when braking
• ESP malfunction: Additional warning messages from the Electronic Stability Program
• Harder brake pedal: The brake pedal requires more force than usual

How to fix the problem of trouble code C1095?

• Repairing trouble code C1095 requires a systematic diagnosis of the ABS system.
• Carry out a complete ABS system diagnosis: Use a professional OBD scanner to check all ABS components, read out fault memory and analyze live data, then identify and replace defective components
• Replace ABS hydraulic block: Dismantle the complete hydraulic block, replace with a new or reconditioned part, bleed the system and carry out a function test
• Replace ABS control unit: Remove the electronic control unit, replace with a compatible spare part and have it programmed with vehicle-specific software
• Change the brake fluid completely: Drain old brake fluid completely, flush system, fill with new DOT-compliant brake fluid and have it professionally bled
• Repair electrical connections: Check all plug connections on the ABS module, clean corroded contacts, repair damaged cables and connect plugs securely
• Replace hydraulic lines: Locate clogged or damaged brake lines, replace defective sections and bleed the system completely