p0234
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Volkswagen · SUVs
Turbocharger/Supercharger A Overboost Condition
Quick Answer
Error code P0234 on your Volkswagen SUVs means: Turbocharger/Supercharger A Overboost Condition. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
CAID4ID6B25N5N-LWBCRAtlas Cross Sport SE 2024Atlas Cross Sport SEL 2024Atlas Cross Sport SEL R-Line 2024Atlas SE 2024Atlas SEL 2024Atlas SEL Premium R-Line 2024ID.4 Pro 2024ID.4 Pro S 2024ID.4 Pro S Plus 2024ID.4 Standard 2024Taos S 2024Taos SE 2024Taos SEL 2024Tiguan S 2024Tiguan SE 2024Tiguan SEL 2024Tiguan SEL R-Line 2024
Likely Causes
How to Fix It
1
Monitor actual boost pressure with a scan tool and compare to the requested boost value during acceleration
2
Inspect the wastegate actuator linkage for binding, disconnection, or seized components
3
Test the N75 boost control solenoid valve for proper operation by applying voltage and checking vacuum switching
4
Check the boost pressure sensor for accurate readings by comparing to a known-good mechanical boost gauge
5
If the wastegate is stuck closed, replace the wastegate actuator or turbocharger assembly as needed
Pro Tip
This issue typically requires professional diagnosis. Attempting this fix without proper training could cause further problems.
Parts You May Need
Wastegate actuator
N75 boost control solenoid valve
Boost pressure sensor
Turbocharger assembly (if wastegate is integrated and failed)
Vacuum lines for boost control
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