What Does P2566 Mean?
The PCM has detected an unstable or erratic signal from the turbocharger boost control position sensor that intermittently drops out or spikes. This points to a poor electrical connection or damaged wiring that loses contact under certain conditions.
Common Causes
40%
Loose or corroded sensor connector with intermittent contact
30%
Chafed or damaged wiring harness with intermittent short or open
15%
Failing position sensor with internal intermittent fault
10%
Vibration-induced wiring damage near turbocharger mounting points
5%
Poor PCM connector contact (rare)
Diagnostic Steps
1
Step 1: Thoroughly inspect sensor connector for corrosion, looseness, or damaged terminals and clean/repair as needed
2
Step 2: Wiggle test all wiring while monitoring live sensor data to reproduce intermittent fault
3
Step 3: Check for proper routing and secure mounting of wiring harness away from heat and moving parts
4
Step 4: Measure sensor signal voltage while manipulating connector and wiring to identify intermittent connection
5
Step 5: Check for Technical Service Bulletins related to wiring harness routing or connector issues for specific vehicle
Estimated Repair Cost
$100 - $550
Parts + labor, varies by vehicle and location
The PCM has detected an unstable or erratic signal from the turbocharger boost control position sensor that intermittently drops out or spikes. This points to a poor electrical connection or damaged wiring that loses contact under certain conditions.
The most common cause of P2566 (Turbocharger Boost Control Position Sensor "A" Circuit Intermittent) is: Loose or corroded sensor connector with intermittent contact
Typical repair costs for P2566 range from $100 to $550, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Intermittent power loss or boost control problems may occur unpredictably. Avoid heavy acceleration until repaired to prevent potential turbocharger overboosting.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2566 to identify the root cause.
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Quick Info
Category
Powertrain
System
Forced Induction System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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