AutoCodes – Generic – P226B

P226B Code - Turbocharger Boost Pressure Too High - Mechanical

Quick Answer

The Variable Geometry Turbocharger (VGT) adjusts turbocharger performance by moving the position of the impeller nozzle, on the high-pressure (engine exhaust gas) side of the turbocharger assembly. Common causes include Powertrain Control Module (PCM) calibration update, Soot build-up on turbocharger, Faulty Electronic Turbo Actuator. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P226B indicates Turbocharger Boost Pressure Too High - Mechanical.
Common causes: Common causes include Powertrain Control Module (PCM) calibration update, Soot build-up on turbocharger, Faulty Electronic Turbo Actuator.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 19,289

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 25, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P226B Description

The Variable Geometry Turbocharger (VGT) adjusts turbocharger performance by moving the position of the impeller nozzle, on the high-pressure (engine exhaust gas) side of the turbocharger assembly. The desired position of the actuator is commanded from the Powertrain Control Module (PCM). The actual position is sensed by the VGT and reported back to the PCM as feedback. Discrepancy in position feedback sent to the module, and commanded position sent to the VGT by more than a prescribed amount will result in failure of device rationality diagnostics. Failure to properly actuate the VGT will result in poor engine performance. The PCM lights the MIL lamp after the diagnostic runs and fails in two drive cycles. The PCM will turn off the MIL lamp immediately after this diagnostic runs and passes in four consecutive drive cycles. The Diagnostic Trouble Code (DTC) will be set when the turbo position is not within the commanded position during desoot or the difference between charge flow and charge flow command is over the calibrated limit.

OBDII Code P226B - Turbocharger Boost Pressure Too High - Mechanical - AutoCodes.com — P226B Code - Turbocharger Boost Pressure Too High - Mechanical

What does this mean?

What are the Possible Causes of the DTC P226B?

Powertrain Control Module (PCM) calibration update
Soot build-up on turbocharger
Faulty Electronic Turbo Actuator
Faulty turbocharger

How to Fix the DTC P226B?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P226B code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P226B code?

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Information for Specific Makes

P226B Dodge — Turbocharger Boost Pressure Too High - Mechanical
P226B RAM — Turbocharger Boost Pressure Too High - Mechanical

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.