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.
- Keep driving?
- Short distances only
- DIY difficulty
- moderate
- Estimated cost
- $150 - $600 (parts and labor)
Best-selling code reader on Amazon. Reads and clears check engine codes on any 1996+ vehicle. Under $30.
Check Price on AmazonAffiliate link -- we earn a commission at no extra cost to you.
Essential for diagnosing sensor codes, checking voltage, and testing circuits. Under $15 and pays for itself on the first job.
Check Price on AmazonAffiliate link -- we earn a commission at no extra cost to you.
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.
Sources
This page is built from documented references. Verify against your own service info before repair work.
Explore More
Was this helpful?
Send this to whoever is fixing the car — your mechanic, or the person asking what the light means.