Turbocharger Boost Control Position Sensor A Circuit Intermittent
What it means
P2566 sets when the "A" turbocharger boost-control position sensor signal cuts out or jumps around instead of reading steadily. That sensor tells the computer where the boost-control actuator (wastegate or vane mechanism) is positioned. An intermittent signal almost always points to a loose connector or chafed wiring, and it can force the turbo control into a reduced-power mode until the connection is repaired.
Can I keep driving? Usually driveable, but expect reduced or surging boost — a dropping-out position signal can put the turbo control into a limp/reduced-power mode.
Real-world scan data
Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.
Common symptoms
What you'll notice
- Check-engine light that may come and go
- Reduced power or inconsistent, surging boost
- Limp mode under load
- Slower or uneven throttle response
Common causes
Most likely first
- Intermittent connection at the boost-control actuator position sensorLikely
- Chafed or loose wiring that flexes with heat and vibrationCommon
- Failing position sensor with an unstable outputCommon
- Corroded or spread connector terminalsLess often
How to diagnose & fix
Work through it in order
- Read freeze-frame data captured when the code set.
- Wiggle-test the actuator's sensor wiring and connector while watching live position data.
- Inspect the harness near the turbo for heat or chafe damage.
- Check that the boost-control actuator moves freely without binding.
- Replace the position sensor or actuator if the signal stays erratic, then clear and retest.
FAQ
Quick answers
Is it safe to drive with P2566?+
Can I just clear P2566?+
Related codes
Read & clear P2566 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.