P0238: Turbocharger Boost Sensor A Circuit High
Can you still drive? Driving is not recommended if the engine is overboosting. Excessive boost can cause severe engine damage. Have it towed if necessary.
What Does P0238 Mean?
Code P0238 means the turbocharger boost pressure sensor is reporting a voltage that exceeds the expected maximum. This could indicate an overboosting condition, a shorted sensor circuit, or a faulty sensor itself. The ECM may engage limp mode to protect the engine from excessive boost pressure.
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
- Short circuit in sensor wiring
- Stuck wastegate causing overboost
- Faulty ECM
Symptoms
- Check engine light on
- Vehicle enters limp mode
- Excessive boost pressure
- Rough running engine
- Poor fuel economy
Diagnostic Steps
- 1Read freeze frame data and note boost pressure readings
- 2Inspect boost sensor wiring for shorts or chafing
- 3Test sensor output with a multimeter
- 4Check wastegate operation manually
- 5Compare actual boost to sensor reading with a mechanical gauge
Recommended Parts & Tools
boost pressure sensor
turbo wastegate actuator
Estimated Repair Cost
| Type | Estimated Cost |
|---|---|
| Total Repair Cost Range | $100 - $900 |
Get a Personalized AI Diagnostic Report
Get a detailed AI diagnosis for code P0238 specific to your vehicle. Includes step-by-step repair instructions, exact parts needed, and a cost breakdown tailored to your make and model.
Chat with AI About P0238Commonly Affected Vehicles
Related Recalls
Frequently Asked Questions
Can P0238 cause engine damage?
Yes, if the high reading reflects actual overboost, excessive pressure can damage pistons, head gaskets, and the turbo itself.
Is P0238 just a sensor issue?
It can be, but you should verify with a mechanical boost gauge. If actual boost is normal, it's likely a sensor or wiring fault.
Community Fix Reports
Community reports are user-submitted and not verified by Auto AI Buddy. Results may vary.
Related Codes
Affiliate Disclosure: This page contains affiliate links. If you purchase products through these links, we may earn a small commission at no additional cost to you. This helps us maintain this free resource. We only recommend products we believe will help you diagnose and repair your vehicle. Prices shown are estimates and may vary.