Exhaust Heat Exchanger Exhaust Bypass Valve B Position Sensor Stop Performance

Where it lives

For P23A8, the part to look at first is the sensor named here.

Check these first

• A valve B position sensor that does not reach its stop
• Carbon buildup limiting valve B travel
• A worn valve B position sensor element
• A calibration fault in the valve B position sensor

What to do next

1. Command the exhaust bypass valve B through its full travel on a scan tool
2. Watch the valve B position sensor voltage at each stop
3. Inspect the valve B linkage for carbon or binding
4. Relearn or recalibrate the valve B position sensor
5. Replace the exhaust bypass valve B position sensor if it will not reach its stop
6. Clear the code and retest

Look up another code