P045A

Symptoms

• Check Engine Light Is On
• Increased emissions of nitrogen oxides (NOx)
• Detonation under load at high engine temperatures
• Decreased fuel efficiency
• Rough engine operation under load
• Possible emergency mode with limited operation of the EGR

Causes

• Faulty EGR valve solenoid B
• Open or shorted valve wiring
• Oxidation or damage to the valve connector
• Clogged or mechanically jammed EGR valve B
• Malfunction of the EGR system control relay
• ECU malfunction (control output transistor)

How to Fix

1. Read all error codes - pay attention to the accompanying EGR codes
2. Find the EGR valve B using the car's wiring diagram
3. Check the supply voltage and grounding of the valve connector
4. Measure the resistance of the valve solenoid (normal: 10–30 ohms)
5. Check the control circuit from the computer to the valve for open and short circuits
6. Clean the valve and its seat from carbon deposits
7. Replace EGR valve B if electrical fault is confirmed
8. Reset the code and take a test drive

Related codes

Error P045A by Vehicle Brand