What this code means

Malfunction in the ABS isolation valve solenoid, used to isolate the master cylinder from the ABS modulator.

Symptoms

• ABS light on
• Brake pedal feels unusual
• ABS not functioning
• Pedal sinks during ABS activation

Common causes

• Isolation valve solenoid failure
• ABS module internal fault
• Wiring open or short
• Contaminated brake fluid

Diagnostic steps

1. Test solenoid resistance through connector
2. Command isolation valve with scan tool
3. Check brake fluid condition
4. Inspect module connector pins

Repair notes

Replace ABS modulator assembly. Bleed brake system thoroughly.

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