P2566 — Turbocharger Boost Control Position Sensor "A" Circuit Intermittent
OBD2 code P2566 flags a problem with the turbocharger / supercharger boost control (turbocharger boost control position sensor "A" circuit intermittent). Short, gentle driving to a shop is usually possible. Common culprits: worn turbocharger, boost leak in intercooler piping or hoses, clogged intake or exhaust (DPF/cat).
powertrain (engine/transmission)
Is it safe to drive?
Drive with caution Drive gently and avoid boost. The car will likely be down on power and may be in limp mode; ignoring boost faults can overheat the engine and destroy the turbo — a far more expensive repair.
How to diagnose with an OBD scanner
- Read the code and freeze frame Connect an OBD2 scanner, confirm P2566 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
- Check for companion codes and TSBs Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
- Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the turbocharger / supercharger boost control for damage, corrosion, chafing or poor contact.
- Subsystem check Reproduce the fault: wiggle the harness and tap the turbocharger boost control position sensor "A" while watching the live signal; heat and vibration usually make intermittent faults appear.
- Subsystem check Pressure-test the intake piping for boost leaks — cracked intercooler hoses are the most common cause.
- Subsystem check Command the boost control solenoid with a scanner and verify wastegate movement.
- Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P2566 does not return.
Approximate repair cost
Repair cost depends on which component actually failed. Typical scenarios for P2566 (parts and labor, USD, independent shop rates): Turbocharger replacement: $1,200–$3,500; Replace boost control solenoid or actuator: $200–$600; Repair boost leak (hoses, clamps, intercooler): $100–$400. Overall, fixing P2566 usually costs between $100 and $3,500. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.
Common questions
How much does it cost to fix P2566?
Turbocharger replacement — $1,200–$3,500; Replace boost control solenoid or actuator — $200–$600; Repair boost leak (hoses, clamps, intercooler) — $100–$400. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.
What are the symptoms of P2566?
Drivers most often notice: Check Engine Light on, black smoke under acceleration, limp-home mode, whistling or siren noise from the engine bay.
How do I diagnose P2566 myself?
Start with a scan: confirm P2566, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the turbocharger boost control position sensor "A", and verify the suspect component against live data before buying parts.
What is the most common cause of P2566?
The most common causes are: worn turbocharger, boost leak in intercooler piping or hoses, clogged intake or exhaust (DPF/cat).
Is it safe to drive with P2566?
Drive gently and avoid boost. The car will likely be down on power and may be in limp mode; ignoring boost faults can overheat the engine and destroy the turbo — a far more expensive repair.
What does P2566 mean?
The engine control module sets P2566 when it detects a fault in the turbocharger / supercharger boost control. In practical terms: turbocharger boost control position sensor "A" circuit intermittent. The code belongs to the powertrain (engine/transmission) group of OBD2 codes.
“Intermittent” means the fault on the turbocharger boost control position sensor "A" circuit comes and goes — the module sees correct values part of the time. These faults are almost always mechanical: a loose pin, a half-broken wire or a connector that loses contact with vibration or temperature changes.
This code does not appear from a single bad reading: the module must see the fault condition repeat under defined operating conditions before it turns on the warning light. The freeze frame captured with P2566 — engine load, rpm, temperature, speed — tells you exactly when the problem occurs, so reproduce those conditions when testing.
What causes P2566?
- contact affected by vibration or heat
- loose or backed-out connector pin
- wire broken inside intact insulation
- clogged intake or exhaust (DPF/cat)
- boost leak in intercooler piping or hoses
- stuck wastegate or faulty boost control solenoid
- worn turbocharger
Common symptoms of P2566
- Check Engine Light on
- black smoke under acceleration
- limp-home mode
- whistling or siren noise from the engine bay
- increased oil consumption
How to diagnose P2566
- Connect an OBD2 scanner, confirm P2566 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
- Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
- Visually inspect the wiring harness and connectors related to the turbocharger / supercharger boost control for damage, corrosion, chafing or poor contact.
- Reproduce the fault: wiggle the harness and tap the turbocharger boost control position sensor "A" while watching the live signal; heat and vibration usually make intermittent faults appear.
- Pressure-test the intake piping for boost leaks — cracked intercooler hoses are the most common cause.
- Command the boost control solenoid with a scanner and verify wastegate movement.
- Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P2566 does not return.
How to fix P2566
Start with the cheapest and most common causes before replacing expensive parts:
- Turbocharger replacement — $1,200–$3,500
- Replace boost control solenoid or actuator — $200–$600
- Repair boost leak (hoses, clamps, intercooler) — $100–$400
How much does it cost to fix P2566?
Repair cost depends on which component actually failed. Typical scenarios for P2566 (parts and labor, USD, independent shop rates):
- Turbocharger replacement: $1,200–$3,500
- Replace boost control solenoid or actuator: $200–$600
- Repair boost leak (hoses, clamps, intercooler): $100–$400
Overall, fixing P2566 usually costs between $100 and $3,500. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.
Can you drive with P2566?
Drive gently and avoid boost. The car will likely be down on power and may be in limp mode; ignoring boost faults can overheat the engine and destroy the turbo — a far more expensive repair.