Exhaust Flow Control Valve B Control Performance

Where it lives

For P2BFB, the description names the valve as the part involved.

Check these first

• Carbon buildup restricting exhaust flow control valve B travel
• A valve B actuator that no longer follows its command
• Mechanical binding in the valve B linkage
• A valve B return spring that weakened

What to do next

1. Command exhaust flow control valve B through its full range
2. Watch valve B position against the commanded value
3. Clean carbon from the valve B and its passages
4. Check the valve B linkage for binding
5. Replace exhaust flow control valve B if it will not track
6. Clear the code and retest

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