Exhaust Pressure Control Valve A Position Sensor/Switch Circuit Range/Performance

Where it lives

For P048C, the description names the sensor as the part involved.

Check these first

• A valve A position sensor that reads outside its expected range
• A valve A that does not travel full stroke
• Carbon limiting valve A travel
• A worn sensor ground

What to do next

1. Command valve A through its range and compare position to command
2. Check the sensor signal against the expected range
3. Clean carbon limiting valve A travel
4. Measure the sensor ground for excessive resistance
5. Clear the code and retest

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