What it means
Generic electrical fault on turbocharger outlet pressure sensor A (post-compressor pressure measurement).
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 sends that information to the control module for engine and boost management. This circuit code indicates an electrical fault in sensor A's circuit; a sensor, connector, wiring fault, or pressure passage problem may be involved, so the circuit and reading both need checking.
Common causes
Most likely first.
- Failed turbocharger outlet pressure sensor A
- Damaged wiring or poor connector contact
- Pressure leak or blockage affecting the sensor reading
Symptoms
- Check engine light on
How to diagnose it
- Record freeze-frame data and compare sensor A's reported outlet pressure with other available pressure readings under the recorded conditions.
- Locate turbocharger outlet pressure sensor A using vehicle service information and inspect its connector, wiring, mounting, and pressure passage for damage or blockage.
- Check the sensor circuit's supply, ground, and signal wiring for open circuits, shorts, loose terminals, or corrosion using the wiring diagram.
- Measure the circuit and sensor output against the manufacturer's specification to distinguish an electrical fault from an implausible pressure reading.
- If the circuit tests correctly, inspect the outlet pressure path for leaks or restrictions that could distort the sensor reading.
Common fixes
- Reconnect the sensor A connector and repair damaged or corroded wiring.
- Clear a blockage or repair a leak in the pressure path to sensor A.
- Secure the sensor mounting if it is loose.
- Replace turbocharger outlet pressure sensor A if it fails circuit or output testing.
Can I keep driving?
The code may only turn on the check-engine light, but inaccurate outlet-pressure information can affect boost control. If the vehicle loses power, makes unusual turbo noises, or enters reduced-power operation, avoid hard acceleration and arrange diagnosis promptly.
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.