Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer is getting a reading that the turbocharger's boost pressure is too high. It's like when you blow too much air into a balloon and it gets too big.
The engine control module (ECM) detects a voltage signal from the turbocharger/supercharger boost sensor that is higher than the expected range.
P0238 is triggered when the ECM receives a signal from the boost pressure sensor that exceeds the maximum threshold. This sensor monitors the pressure of the air being forced into the engine by the turbocharger or supercharger. A high circuit signal indicates that the pressure is higher than what the ECM considers normal, which could be due to a sensor issue, wiring problem, or an actual overboost condition.
• Check Engine Light is on
• Reduced engine performance
• Poor fuel economy
• Engine may go into limp mode
• Faulty boost pressure sensor
• Wiring issues such as shorts or open circuits
• Failed turbocharger or supercharger
• Faulty ECM
• Vacuum leaks
ECM: Engine Control Module
Boost Pressure Sensor: A sensor that measures the pressure of air entering the engine from the turbocharger or supercharger
Turbocharger: A device that increases engine power by forcing extra air into the combustion chamber
• Use an OBD-II scanner to confirm the code.
• Inspect the boost pressure sensor and its wiring for damage.
• Check for vacuum leaks or damaged hoses.
• Test the turbocharger/supercharger for proper operation.
• Replace the boost pressure sensor if faulty.
• Repair or replace damaged wiring or connectors.
• Fix any vacuum leaks.
• Repair or replace the turbocharger/supercharger if necessary.
• OBD-II scanner
• Multimeter
• Vacuum gauge
$100 - $500
Moderate
• Ford F-150
• Chevrolet Silverado
• Volkswagen Golf
• Regular maintenance of turbocharger/supercharger systems
• Inspect and replace air filters regularly
• Check and maintain proper vacuum hose connections
Sensor Issue
• Do not ignore the Check Engine Light.
• Get the vehicle inspected by a professional if you are unsure.
• Avoid driving aggressively until the issue is resolved.
Check with your vehicle manufacturer for warranty coverage on emissions-related components.
This code has been more common in vehicles with forced induction systems as they age or if maintenance is neglected.
Moderate – While the vehicle may still be driveable, it can lead to further engine issues if not addressed.
Ignoring this code can lead to increased emissions and potential engine damage.
• Engine running
• Vehicle at operating temperature
The boost pressure sensor is typically located on or near the intake manifold or the turbocharger/supercharger.
Q: Can I drive with a P0238 code?
A: It's possible to drive with this code, but it is not recommended as it can lead to further engine damage.
Q: Will a P0238 code cause my car to fail emissions testing?
A: Yes, a P0238 code can cause your vehicle to fail emissions testing due to improper air-fuel mixture.
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