P2066 moderate

Turbocharger Boost Control 'B' Position Sensor Circuit Low

The P2066 code means the vehicle's onboard diagnostic system has detected: Turbocharger Boost Control 'B' Position Sensor Circuit Low. This is a moderate severity code.

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Keep driving?: Short distances only
DIY difficulty: moderate
Estimated cost: $150 - $600 (parts and labor)

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Common Symptoms

Check Engine Light on
Low turbo boost
Reduced power
Poor acceleration response
Engine may feel flat

Probable Causes (Ranked by Likelihood)

Short to ground in B position sensor wiring Very High
Failed B sensor with low voltage output High
Heat-damaged connector Moderate
ECM B input circuit fault Low

Step-by-Step Diagnostic Procedure

Measure B sensor signal voltage
Inspect wiring for shorts near hot exhaust
Check connector for heat damage
Test sensor with applied pressure or vacuum

Frequently Asked Questions

What does P2066 mean?

P2066 indicates: Turbocharger Boost Control 'B' Position Sensor Circuit Low. The ECM has detected a problem with the turbocharger boost control system.

Can a dirty turbo cause this code?

Yes, carbon and soot buildup on the VGT (Variable Geometry Turbo) vanes is a common cause of boost control codes, especially on diesel engines. Cleaning the turbo vanes can sometimes resolve the issue.

How much does a turbo repair cost?

Sensor and actuator repairs typically cost $150 to $600. If the turbocharger itself needs replacement, costs can reach $1500 to $3000 including labor.