AutoCodes – GMC – P0238 GMC

P0238 GMC 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 GMC 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 1,672

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 03, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0238 GMC 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 GMC - Turbocharger Boost Sensor Circuit High Voltage - AutoCodes.com — P0238 GMC Code - Turbocharger Boost Sensor Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P0238 GMC?

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 GMC?

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 GMC 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.

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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 GMC Code

1. What are common symptoms of OBDII code P0238 in a GMC vehicle?

The common symptoms of OBDII code P0238 in a GMC vehicle include reduced engine power, check engine light illuminated on the dashboard, and possible engine stalling.

2. What does the OBDII code P0238 indicate in a GMC vehicle?

OBDII code P0238 in a GMC vehicle indicates a potential issue with the Turbocharger Boost Sensor Circuit registering high voltage, which can affect the performance of the turbocharger system.

3. What are the possible causes of OBDII code P0238 in a GMC vehicle?

Possible causes of OBDII code P0238 in a GMC vehicle include a faulty turbocharger boost sensor, wiring issues in the sensor circuit, a damaged sensor connector, or a problem with the engine control module.

4. How can I diagnose the Turbocharger Boost Sensor Circuit high voltage issue in my GMC vehicle?

Diagnosing the Turbocharger Boost Sensor Circuit high voltage issue in a GMC vehicle involves inspecting the sensor wiring, checking the sensor's voltage output, testing the sensor's resistance, and verifying the sensor's signal to the engine control module.

5. Can I still drive my GMC vehicle with OBDII code P0238 active?

It is not recommended to continue driving your GMC vehicle with OBDII code P0238 active, as it can lead to further engine performance issues and potential damage to the turbocharger system. It is advisable to address the issue promptly.

6. How can I repair OBDII code P0238 in my GMC vehicle?

Repairing OBDII code P0238 in a GMC vehicle involves replacing the faulty turbocharger boost sensor, repairing any damaged wiring or connectors in the sensor circuit, and clearing the trouble code with an OBDII scanner after the repair is completed.

7. Are there any preventive maintenance tips to avoid OBDII code P0238 in a GMC vehicle?

To prevent OBDII code P0238 in a GMC vehicle, it is recommended to regularly inspect the turbocharger system, including the boost sensor and related wiring, during routine maintenance checks. Keeping the system clean and free of debris can also help prevent issues.

8. Can a DIY enthusiast fix OBDII code P0238 in a GMC vehicle?

While some DIY enthusiasts may have the skills to diagnose and repair OBDII code P0238 in a GMC vehicle, it is recommended to seek professional help if you are not experienced in working with turbocharger systems or engine sensors to ensure proper repair and avoid further damage.

9. Will OBDII code P0238 cause permanent damage to my GMC vehicle if left untreated?

If left untreated, OBDII code P0238 in a GMC vehicle can potentially cause permanent damage to the turbocharger system and engine components, leading to costly repairs in the long run. It is best to address the issue promptly.

10. How long does it take to repair OBDII code P0238 in a GMC vehicle?

The time it takes to repair OBDII code P0238 in a GMC vehicle can vary depending on the specific cause of the issue and the complexity of the repair. In general, the repair process can take anywhere from a few hours to a full day, depending on the extent of the repairs needed.