What it means
Turbocharger outlet pressure sensor A circuit signal is above the expected range.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
Turbocharger outlet pressure sensor A measures pressure after the compressor, and the control module reads its electrical signal to manage engine operation. This code is set when the signal is higher than expected; an open signal wire, poor connector contact, or a supply wire touching battery positive can cause that condition.
Common causes
Most likely first.
- Signal wire open
- Connector pins corroded - high contact resistance
- Supply wire pinched against B+ source
Symptoms
- Check engine light on
How to diagnose it
- Record freeze-frame data and compare sensor A's outlet-pressure value with other pressure readings to see whether the reported pressure is implausibly high.
- Inspect sensor A's connector and harness for corrosion, loose pins, broken conductors, or a pinched wire touching battery positive.
- Use the wiring diagram to check for an open signal circuit and inspect the sensor supply and ground connections.
- Test the signal and supply circuits against the manufacturer's specification to distinguish an open or shorted wire from a sensor fault.
- If the circuit checks out, test sensor A's output and inspect its pressure path for a reading that is mechanically implausible.
Common fixes
- Reconnect loose terminals or repair corroded connector contacts.
- Repair an open signal wire or a supply wire pinched against battery positive.
- Replace damaged wiring and secure the harness away from pinch points.
- Replace turbocharger outlet pressure sensor A if its output remains too high with a sound circuit.
Can I keep driving?
The code may only illuminate the check-engine light, but an erroneously high outlet-pressure signal can affect boost control. Avoid hard acceleration if the vehicle's power or boost response changes, and have it checked soon.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.