P0234 on Mercedes-Benz
Turbo/Supercharger Overboost Condition
P0234 on Mercedes-Benz vehicles indicates turbo/supercharger overboost condition. Au7o has documented this code across 1 Mercedes-Benz model — most commonly on Sprinter. 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. Typical repair costs on Mercedes-Benz range from $200 to $600, depending on the specific model and root cause.
Common Causes of P0234
- •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
P0234 on Mercedes-Benz by Model
Mercedes-Benz Sprinter(1 issue)
- Turbo Resonator Crack and Boost Leak2007-2018
The plastic turbo resonator (charge air pipe) on OM642-equipped Sprinters cracks from heat cycling and vibration, causing a significant boost leak. The engine loses power dramatically, especially under load or when climbing grades. This is one of the most common failure items on pre-2019 Sprinters and typically occurs between 60,000-100,000 miles.
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View P0234 across all makes →Frequently Asked Questions
What does P0234 mean on Mercedes-Benz?▼
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. On Mercedes-Benz specifically, this code is documented across 1 model.
What causes P0234 on Mercedes-Benz vehicles?▼
Common causes on Mercedes-Benz: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0234 on a Mercedes-Benz?▼
Repair costs on Mercedes-Benz range from $200 to $600, depending on the specific model and root cause.
Which Mercedes-Benz models have P0234 documented?▼
Au7o has documented P0234 on 1 Mercedes-Benz model: Sprinter.