What are the common causes of P259D?

A sticking turbocharger B wastegate. A boost pressure sensor reading off. A failed boost control solenoid. Boost control system leaks or blockages on the turbocharger B circuit.

Read the turbocharger B boost control data on a scan tool. Check the boost control solenoid for sticking. Check the boost pressure sensor signal. Check the boost control system for leaks or blockages. Replace the turbocharger B wastegate if the solenoid and sensor test good. Clear the code and retest.

P259D

Excessive Time To Enter Closed Loop Turbocharger B Boost Control

System: Speed and idle control (P code)
Lamp: Check Engine Light
Category: Powertrain - Computer and Auxiliary Controls

What it means

P259D means Excessive Time To Enter Closed Loop Turbocharger B Boost Control.

Check these first

A sticking turbocharger B wastegate
A boost pressure sensor reading off
A failed boost control solenoid
Boost control system leaks or blockages on the turbocharger B circuit

What to do next

Read the turbocharger B boost control data on a scan tool
Check the boost control solenoid for sticking
Check the boost pressure sensor signal
Check the boost control system for leaks or blockages
Replace the turbocharger B wastegate if the solenoid and sensor test good
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.