Exhaust Heat Exchanger Exhaust Bypass Valve B Stuck Open

Where it lives

For P23A6, the part to look at first is the valve named here.

Check these first

• Carbon buildup holding the valve B open
• A failed bypass valve B actuator motor
• A broken bypass valve B return spring
• Mechanical binding in the valve B linkage

What to do next

1. Command the exhaust bypass valve B closed and watch position on a scan tool
2. Inspect the valve B linkage for binding
3. Check the valve B return spring
4. Clean carbon from the valve B actuator
5. Replace the exhaust bypass valve B actuator if it will not move
6. Clear the code and retest

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