What this code means

Malfunction in the brake booster vacuum or pressure sensor circuit.

Symptoms

• Brake warning light on
• Hard brake pedal
• Increased stopping distance
• Check Engine Light may also be on

Common causes

• Faulty brake booster pressure sensor
• Vacuum hose leak
• Wiring damage
• Brake booster vacuum pump failure on diesel/turbo vehicles

Diagnostic steps

1. Test brake booster vacuum with gauge
2. Check vacuum hose to booster
3. Test pressure sensor signal
4. Inspect wiring and connector
5. Check engine vacuum source

Repair notes

Repair vacuum leak or replace pressure sensor. On diesel vehicles, check vacuum pump.

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