AutoCodes – Chevrolet – P0238 Chevrolet

P0238 Chevrolet Code - Turbocharger Boost Sensor Circuit High Voltage

Quick Answer

The boost sensor responds to pressure changes in the intake manifold. Common causes include Faulty Boost Sensor, Boost Sensor harness is open or shorted, Boost Sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P0238 Chevrolet indicates Turbocharger Boost Sensor Circuit High Voltage.
Common causes
Common causes include Faulty Boost Sensor, Boost Sensor harness is open or shorted, Boost Sensor circuit poor electrical connection.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
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Code Popularity 2,848
How popular is this code, among other codes? Low
Table of contents Created and updated by William Orellana on Jun 03, 2021
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Code P0238 Chevrolet Description

The boost sensor responds to pressure changes in the intake manifold. This pressure is created by the turbocharger and changes with Accelerator Pedal Position (APP) and engine speed. The Engine Control Module (ECM) uses this information to provide engine overboost protection. The boost sensor has a 5-volt reference circuit, a low reference circuit, and a signal circuit. The ECM supplies 5 volts to the boost sensor on the 5-volt reference 2 circuit, and provides a ground on a low reference circuit. The boost sensor provides a signal to the ECM on a signal circuit relative to the pressure changes. The ECM monitors the boost sensor signal for voltage outside of the normal range. If the ECM detects a boost sensor signal voltage that is excessively high, this DTC will set.
OBDII Code P0238 Chevrolet - Turbocharger Boost Sensor Circuit High Voltage - AutoCodes.com
P0238 Chevrolet Code - Turbocharger Boost Sensor Circuit High Voltage

What are the Possible Causes of the DTC P0238 Chevrolet?

  • Faulty Boost Sensor
  • Boost Sensor harness is open or shorted
  • Boost Sensor circuit poor electrical connection
  • Faulty Engine Control Module (ECM)

How to Fix the DTC P0238 Chevrolet?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0238 Chevrolet code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0238 Chevrolet code?

Need more information on how to fix the P0238 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0238 Chevrolet code diagnosed by a professional: Find a repair shop in your area

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0238 Chevrolet Code

1. What are some common symptoms of OBDII code P0238 in a Chevrolet related to the turbocharger boost sensor circuit high voltage?

Common symptoms may include engine hesitation, reduced power output, illuminated Check Engine Light, and potential stalling.

2. What are the typical causes of OBDII code P0238 in a Chevrolet indicating high voltage in the turbocharger boost sensor circuit?

Possible causes include a faulty turbocharger boost sensor, damaged wiring or connectors in the sensor circuit, or a malfunctioning engine control module (ECM).

3. How can I diagnose the issue causing OBDII code P0238 in my Chevrolet related to the turbocharger boost sensor circuit high voltage?

Diagnosis typically involves checking the turbocharger boost sensor for proper operation, inspecting the sensor wiring for damage, and using a scan tool to monitor sensor readings.

4. Are there any common repair tips for fixing OBDII code P0238 in a Chevrolet due to high voltage in the turbocharger boost sensor circuit?

Repair tips may include replacing the turbocharger boost sensor, repairing damaged wiring or connectors, and resetting the ECM to clear the code.

5. Can driving with OBDII code P0238 triggered in a Chevrolet indicating high voltage in the turbocharger boost sensor circuit cause further damage?

Continuing to drive with this code may lead to reduced engine performance and potential damage to the turbocharger system over time, so it's recommended to address the issue promptly.

6. Is it safe to clear OBDII code P0238 in a Chevrolet without addressing the underlying cause related to the turbocharger boost sensor circuit high voltage?

Clearing the code without fixing the root cause may temporarily turn off the Check Engine Light, but the issue will likely resurface, potentially affecting engine performance and fuel efficiency.

7. Can extreme weather conditions or environmental factors trigger OBDII code P0238 in a Chevrolet due to high voltage in the turbocharger boost sensor circuit?

Extreme temperatures or moisture can sometimes impact sensor readings and trigger this code, so it's important to inspect the sensor and wiring for any signs of weather-related damage.

8. How much does it typically cost to repair OBDII code P0238 in a Chevrolet caused by high voltage in the turbocharger boost sensor circuit?

The cost of repair can vary depending on the specific issue, but it may involve expenses for parts such as a new sensor, wiring repairs, and potential labor costs for diagnosis and replacement.

9. Are there preventative measures I can take to avoid encountering OBDII code P0238 in my Chevrolet due to high voltage in the turbocharger boost sensor circuit?

Regular maintenance checks, keeping the sensor and wiring clean and free of debris, and addressing any issues promptly can help prevent this code from occurring.

10. Can a DIY enthusiast with basic automotive knowledge fix OBDII code P0238 in a Chevrolet related to the turbocharger boost sensor circuit high voltage?

While some aspects of diagnosis and repair may be within reach for a DIY enthusiast, dealing with complex sensor and wiring issues may require professional expertise to ensure the problem is properly resolved.

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