C054B

Symptoms

• Check Engine Light Is On
• Unstable engine idling
• Increased fuel consumption
• Reduced engine power
• Problems with the brake booster (if the sensor is connected to the brake system)

Causes

• Faulty vacuum sensor
• Open or short circuit in wiring harness
• Poor contact in the sensor connector
• Damage to the wiring from the sensor to the ECU
• Problems with power supply or sensor ground
• ECU malfunction (rare)

How to Fix

1. Check the integrity and supply voltage of the sensor (usually 5V)
2. Check sensor resistance and signal to specifications
3. Inspect the wiring harness for damage
4. Check the contacts in the sensor and ECU connectors for corrosion and connection reliability
5. If necessary, replace the vacuum sensor

Related codes

Error C054B by Vehicle Brand