P0234: Turbo/Supercharger Overboost Condition
69 vehicles · 20 makes
P0234 is an OBD-II diagnostic trouble code meaning “Turbo/Supercharger Overboost Condition.” Boost pressure has exceeded the maximum allowable limit. Can cause engine damage if ignored. The ECU will typically cut fuel or ignition to protect the engine. This code appears across 69 vehicle models from 20 manufacturers.
Common Causes
Diagnostic Tools
To diagnose P0234, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
As an Amazon Associate, we earn from qualifying purchases. Prices are approximate and may vary.
Vehicles Affected (69)
Turbocharger Failure
3.0T Turbo Wastegate Rattle and Actuator Failure
Turbo Wastegate Rattle and Carbon Buildup
Turbocharger Oil Strainer Blockage Causing Engine Stall (4.0T NHTSA Recall)
Turbocharger Oil Supply Filter Clogging (4.0T TFSI)
Excessive Oil Consumption (2.0T TFSI Engine)
IS20 Turbocharger Wastegate Rattle and Actuator Failure
Turbocharger Oil Strainer Blockage and Engine Stall (4.0T NHTSA Recall)
Turbocharger Oil Supply Filter Clogging (4.0T TFSI)
B5 2.7T Turbocharger Failure
S55 Crank Hub Slip/Failure
S55 Plastic Charge Pipe Cracking
Plastic Charge Pipe Failure Under Boost
Turbo Wastegate Rattle at Idle
S58 Plastic Charge Pipe Cracking Under Boost
S58 Plastic Charge Pipe Cracking Under Boost
N63TU3 Valve Stem Seal Failure & Oil Consumption (M850i)
Turbo Charge Pipe Failure - F22/F23 228i/230i/M240i
N63 Turbocharger Failure - F01/F02 750i/750Li
S63/S63TU Ignition Coil Premature Failure
Turbo Charge Pipe Failure - 428i/435i/440i F32/F33/F36
N54 Wastegate Rattle & Turbo Failure (135i / 1M)
S63 Twin Turbo Wastegate Rattle - E70/F85 X5 M
Turbocharger Wastegate Rattle (N55, N20, B58 Engines)
N54 Twin Turbo Wastegate Rattle - E89 Z4 sDrive35i/35is
N54 Charge Pipe Failure (135i / 1M)
N54 Spark Plug & Ignition Coil Failure (135i / 1M)
Electric Water Pump Failure - All Turbocharged Models
S63 V8 Twin-Turbocharger Failure - F10 M5
Turbo Charge Pipe Failure - F87 M2/M2C
S63 Turbo Coolant Line Plastic T-Fitting Failure (Hot-V Design) - E70 X5 M
N54 Fuel Injector Failure (135i / 1M)
B48/B58 Electric Water Pump & Thermostat Failure - G29 Z4
Twin-Turbo V6 Squealing Noise on Acceleration
3.0L Twin-Turbo V6 Wastegate Actuator Failure
2.0T LTG Turbo System Issues - PCV and Wastegate
2.0T LTG Turbo System Issues - PCV and Wastegate
2.0T LSY Engine - Valve Cover/PCV and Coolant Issues
2.0T LSY Engine - PCV and Turbo Coolant Line Issues
1.5T Turbo PCV Valve and Oil Leak Issues
2.0L Turbo (LTG) Engine Problems
Turbo Oil Feed Line Leak (1.4T LUJ/LUV)
1.4T Ecotec Turbo and Coolant Issues
1.4T Turbo Oil Feed Line Leak and PCV Issues
1.5T LFV/LYX Engine PCV System and Oil Consumption
1.4L Turbo Wastegate Actuator Failure
6.7L Power Stroke Early-Generation Turbocharger Failure (2011-2014)
3.5L EcoBoost Twin Turbocharger Failure
2.0L EcoBoost Cold-Start Hesitation and Bucking at Low Speeds
Turbo Wastegate Actuator Sticking Causing Limp Mode
7.3L Powerstroke Turbo Pedestal O-Ring Leak
Turbocharger Failure/Wastegate Rattle
2.0T Turbocharger Wastegate Rattle and Failure
Early MK7 IHI Turbocharger Failure
Turbo Diverter Valve (DV) Failure and Boost Leak
Turbocharger Wastegate Rattle
IS20 Turbocharger Failure
PCV System Failure Causing Oil Leaks and Engine Damage
T5/T6 Engine Excessive Oil Consumption
Turbocharger Failure and Wastegate Rattle
Electronic Throttle Module (ETM) Failure
T5 Turbocharger Failure from Oil Starvation
T6 3.0L Twin-Scroll Turbo Failure and Oil Leaks
T4/T5 Turbocharger Oil Feed Line Leak
T6 Twin-Charged Engine Supercharger Drive Belt and Turbo Oil Line Leak
T6 Supercharger Electromagnetic Clutch Failure
FAQ
What does P0234 mean?
P0234 stands for "Turbo/Supercharger Overboost Condition." Boost pressure has exceeded the maximum allowable limit. Can cause engine damage if ignored. The ECU will typically cut fuel or ignition to protect the engine.
What are the most common causes of P0234?
The most common causes of P0234 are: Stuck wastegate, Faulty boost control solenoid, Boost pressure sensor malfunction, Vacuum line leak to wastegate, Failed wastegate actuator. The specific cause varies by vehicle.
How much does it cost to fix P0234?
Repair costs vary widely depending on the root cause and vehicle.
Which vehicles are affected by P0234?
Au7o has documented P0234 across 69 vehicle models from 20 manufacturers: Audi, BMW, Cadillac, Chevrolet, Chrysler, Dodge, Ford, GMC, Honda, Hyundai, Kia, MINI, Mazda, Mercedes-Benz, Nissan, Renault, Subaru, Toyota, Volkswagen, Volvo.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.