Exhaust Gas Recirculation (EGR) Flow
2009-2009 Volvo S80 3.2L I6
The 2009 Volvo S80 is equipped with a 3.2L inline-6 engine. Below you'll find detailed p0400 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
The EGR system flow is not within expected parameters.
Symptoms
- Check Engine Light
- Rough idle
- Pinging/knocking
- Increased NOx emissions
- Failed emissions test
Common Causes
- Clogged EGR passages
- Faulty EGR valve
- EGR valve stuck closed
- Carbon buildup
- Vacuum line issue
Diagnostic Steps
- Test EGR valve operation
- Check EGR passages for carbon buildup
- Test vacuum supply to EGR valve
- Monitor EGR position with scan tool
- Inspect EGR tube
Repair Notes
Clean EGR valve and passages. Replace EGR valve if stuck or faulty.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P0400 on Other Vehicles
Common Questions
What does code P0400 mean on a 2009-2009 Volvo S80?
P0400 stands for "Exhaust Gas Recirculation (EGR) Flow". The EGR system flow is not within expected parameters.
What are the symptoms of P0400 on a Volvo S80?
Common symptoms of P0400 include: Check Engine Light, Rough idle, Pinging/knocking, Increased NOx emissions, Failed emissions test.
What causes P0400 on a 2009-2009 Volvo S80?
Common causes of P0400 include: Clogged EGR passages, Faulty EGR valve, EGR valve stuck closed, Carbon buildup, Vacuum line issue.
Last updated: March 2026