P0235: Turbocharger Boost Sensor A Circuit Malfunction
Can you still drive? Drive gently. The engine may be in limp mode with reduced power. Avoid heavy acceleration until the boost sensor is repaired.
What Does P0235 Mean?
Code P0235 indicates that the turbocharger boost pressure sensor is reporting a signal that is outside the expected range or is irrational. The ECM relies on this sensor to manage turbo boost levels and protect the engine from over-boost conditions. A malfunctioning sensor can cause improper boost control and reduced performance.
Need to read your codes?
An OBD-II scanner lets you read and clear diagnostic trouble codes from your vehicle's computer. Most scanners work with any car made after 1996.
Browse OBD-II Scanners on AmazonCommon Causes
- Faulty boost pressure sensor
- Damaged or disconnected vacuum line to the sensor
- Corroded sensor connector
- Wiring fault in the sensor circuit
- Boost leak in the intercooler piping
Symptoms
- Check engine light on
- Loss of turbo boost and power
- Engine in limp mode
- Poor acceleration
- Possible turbo surging or flutter
Diagnostic Steps
- 1Read freeze frame data and check boost pressure readings
- 2Inspect the vacuum or pressure line to the boost sensor for cracks or disconnection
- 3Check the sensor connector for corrosion or damage
- 4Compare boost sensor reading to a known good gauge at idle and under load
- 5Test sensor wiring continuity between the sensor and ECM
- 6Replace the sensor if readings do not match actual boost pressure
Recommended Parts & Tools
boost pressure sensor
silicone vacuum hose kit
Estimated Repair Cost
| Type | Estimated Cost |
|---|---|
| Total Repair Cost Range | $100 - $500 |
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Chat with AI About P0235Commonly Affected Vehicles
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Frequently Asked Questions
Can a disconnected hose cause P0235?
Yes, the boost pressure sensor is connected to the intake manifold or turbo piping via a small vacuum hose. If this hose is cracked, disconnected, or blocked, the sensor will give incorrect readings.
Will P0235 damage my turbo?
The code itself indicates a sensor problem, not turbo damage. However, if boost is not being properly monitored, an over-boost condition could go undetected and potentially harm the turbo or engine.
Community Fix Reports
Community reports are user-submitted and not verified by Auto AI Buddy. Results may vary.
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