P0234: Turbo/Supercharger Overboost Condition
56 vehicles · 19 makes · $50-$15,000 repair
Most Reported On
P0234 is an OBD-II diagnostic trouble code meaning “Turbo/Supercharger Overboost Condition.” P0234 means the engine computer detected an overboost condition — the turbocharger or supercharger produced more boost pressure than the system allows. The computer monitors manifold/boost pressure and compares it to a safe target; when boost exceeds the threshold (or rises too fast), it sets this code, often cutting power to protect the engine. Excess boost can stress pistons, gaskets, and other components, so the system typically enters a reduced-power 'limp' mode. It generally points to a stuck or malfunctioning boost-control component rather than an internal engine fault. This code is most commonly reported on 2022-2023 Toyota Tundra (1794 Edition, Capstone, Limited, Platinum, SR, SR5, TRD Pro, i-FORCE MAX), 2004-2012 Volvo S40, and 2007-2013 MINI Cooper S (John Cooper Works, S), plus 53 other vehicles, with repair costs ranging from $50 to $15,000.
Common Causes
Typical Repair Cost
Based on 66 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
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 (56)
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
N63 Turbocharger Failure - F01/F02 750i/750Li
Turbo Charge Pipe Failure - F87 M2/M2C
S63 Twin Turbo Wastegate Rattle - E70/F85 X5 M
N63 Turbo Wastegate Rattle (xDrive50i)
Turbocharger Wastegate Rattle (N55, N20, B58 Engines)
N54 Twin Turbo Wastegate Rattle - E89 Z4 sDrive35i/35is
S63 V8 Twin-Turbocharger Failure - F10 M5
1.5T Turbo PCV Valve and Oil Leak Issues
2.0L Turbo (LTG) Engine Problems
1.5T LFV/LYX Engine PCV System and Oil Consumption
1.4L Turbo Wastegate Actuator Failure
1.4T Ecotec Turbo and Coolant Issues
Turbo Oil Feed Line Leak (1.4T LUJ/LUV)
Turbo Wastegate Regulator Solenoid Failure Causing Overboost/Underboost and Reduced Engine Power
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
2.3L EcoBoost Turbo Wastegate Rattle and P0299 Underboost / Limp Mode
EcoBoost Turbo Underboost (P0299) — Boost Leaks, Bypass Valve Diaphragm, and Warped Air Deflector
3.5L EcoBoost Turbocharger Wastegate Failure — Stuck Wastegate / Reduced Engine Power
EcoBoost Turbocharger Wastegate Actuator Rattle
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
IS20 Turbocharger Failure
1.9 TDI VNT turbo actuator sticking and MAF sensor failure (power loss / limp mode)
IS38 Turbocharger Wastegate Rattle and Electronic Actuator 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
D4 Diesel Turbocharger Wear (European-market diesel) — Power Loss, Black Smoke and Whistling
FAQ
What does P0234 mean?
P0234 stands for "Turbo/Supercharger Overboost Condition." P0234 means the engine computer detected an overboost condition — the turbocharger or supercharger produced more boost pressure than the system allows. The computer monitors manifold/boost pressure and compares it to a safe target; when boost exceeds the threshold (or rises too fast), it sets this code, often cutting power to protect the engine. Excess boost can stress pistons, gaskets, and other components, so the system typically enters a reduced-power 'limp' mode. It generally points to a stuck or malfunctioning boost-control component rather than an internal engine fault.
What are the most common causes of P0234?
The most common causes of P0234 are: Stuck or faulty wastegate (mechanical or stuck closed), Faulty boost / wastegate control solenoid, Stuck or faulty turbocharger bypass / blow-off valve, Disconnected, cracked, or leaking boost control vacuum hoses, Faulty boost pressure (MAP) sensor giving false readings, Failed or stuck variable-vane (VGT) turbo mechanism, Wiring or connector fault in the boost control circuit. The specific cause varies by vehicle.
How much does it cost to fix P0234?
Repair costs for P0234 range from $50 to $15,000, depending on the vehicle and root cause.
Which vehicles are affected by P0234?
Au7o has documented P0234 across 56 vehicle models from 19 manufacturers: BMW, Chevrolet, Chrysler, Dodge, Ford, GMC, Honda, Hyundai, Kia, MINI, Mazda, Mercedes-Benz, Nissan, Renault, Saab, Subaru, Toyota, Volkswagen, Volvo.
Sources (12)
- mediaCarPro: Toyota Expands Twin-Turbo V6 Engine Recall
- mediaThe Drive: We Finally Know Why the Toyota Tundra V6 Keeps Self-Destructing
- mediaAutoGuide: Toyotas Twin-Turbo Tundra Trouble Just Got Bigger
- article6.7L Turbo Failure - PowerStrokeHelp.com
- article2011-2014 Post-Warranty Power Stroke Fix: Ditching the VGT - DrivingLine
- mediaClassAction.org: Honda Hid Engine Oil Dilution Defect in CR-V, Civic, Accord
- mediaMyCarVoice: Honda 1.5L Turbo Oil Dilution Problems Lawsuit (MY2018-2021)
- mediaTop Class Actions: Honda Oil Dilution Class Action Settlement
- otherCarComplaints: Honda Fuel Dilution Problems Cause Class-Action Lawsuit
- videoFord Transit 3.5L EcoBoost Turbocharger Replacement - EricTheCarGuy
- videoEricTheCarGuy - Diagnosing and Fixing Turbo Wastegate Rattle on VW Jetta
- ForumReddit r/MechanicAdvice: 2023 Mazda CX-50 Turbo Wastegate Rattle on Cold Start
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.