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Engine-Codes – Chevrolet – P0038 2018 Chevrolet Silverado

P0038 2018 Chevrolet Silverado Code - HO2S Heater Control Circuit High Voltage Bank 1 Sensor 2

Quick Answer

The P0038 diagnostic trouble code (DTC) for a 2018 Chevrolet Silverado refers to a problem with the HO2S (Heated Oxygen Sensor) Heater Control Circuit High Voltage for Bank 1 Sensor 2. Common causes include Faulty oxygen sensor heater, Damaged wiring or connectors in the heater circuit, Blown fuse related to the oxygen sensor heater. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means
P0038 2018 Chevrolet Silverado indicates HO2S Heater Control Circuit High Voltage Bank 1 Sensor 2.
Common causes
Common causes include Faulty oxygen sensor heater, Damaged wiring or connectors in the heater circuit, Blown fuse related to the oxygen sensor heater.
Severity
Moderate - service should be scheduled soon.
Can I drive?
The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
What is this?
Table of contents Created and updated by William Orellana on Sep 17, 2024
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Code P0038 2018 Chevrolet Silverado Description

The P0038 diagnostic trouble code (DTC) for a 2018 Chevrolet Silverado refers to a problem with the HO2S (Heated Oxygen Sensor) Heater Control Circuit High Voltage for Bank 1 Sensor 2. This code indicates that there is a high voltage condition detected in the heater control circuit of the downstream oxygen sensor located after the catalytic converter on the bank 1 side of the engine. The oxygen sensor plays a crucial role in monitoring the oxygen levels in the exhaust gases and providing feedback to the engine control module (ECM) for optimal fuel efficiency and emissions control.

OBDII Code P0038 2018 Chevrolet Silverado - HO2S Heater Control Circuit High Voltage Bank 1 Sensor 2
P0038 2018 Chevrolet Silverado Code - HO2S Heater Control Circuit High Voltage Bank 1 Sensor 2

Common Causes of P0038 2018 Chevrolet Silverado

  1. Faulty oxygen sensor heater
  2. Damaged wiring or connectors in the heater circuit
  3. Blown fuse related to the oxygen sensor heater
  4. Malfunctioning ECM
  5. Corrosion or contamination in the sensor connector

Symptoms of P0038 2018 Chevrolet Silverado

  1. Decreased fuel efficiency
  2. Rough idling or stalling
  3. Poor acceleration
  4. Check Engine Light illuminated
  5. Increased emissions

How to Fix P0038 2018 Chevrolet Silverado

  1. Begin by diagnosing the issue using a scan tool to confirm the P0038 code and perform a visual inspection of the oxygen sensor and its wiring.
  2. Test the oxygen sensor heater circuit for proper voltage and resistance to determine if the sensor itself is faulty or if there is an issue with the wiring or connectors.
  3. Replace the downstream oxygen sensor (Bank 1 Sensor 2) if the heater circuit is found to be faulty, ensuring the new sensor is compatible with the vehicle's make and model.
  4. Clear the DTC and perform a test drive to verify that the repair has resolved the issue and that the Check Engine Light does not reappear.
  5. If the problem persists, further diagnostics may be required to identify any underlying issues with the wiring, connectors, fuse, or ECM that may be causing the high voltage condition.

Cost to Fix P0038 2018 Chevrolet Silverado

The typical repair costs for addressing a P0038 code on a 2018 Chevrolet Silverado can range from $150 to $300, including parts and labor. However, the specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. It's advisable to check local rates for a more precise estimate. Keep in mind that rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less for repairs.

What does this mean?

Tech Notes for P0038 2018 Chevrolet Silverado

The code means that there is a problem with the heater element circuit of the heated oxygen sensor. The control module monitors how long it takes the sensor to warm up and start sending an adequate signal. The code is set when the sensor is taking too long to warm up. Water getting inside the heated oxygen sensor connector can cause the heated oxygen sensor fuse to blow. Before replacing the sensor, check for the condition of the heated oxygen sensor fuse and connectors. If the fuse and connector are OK, replacing the O2 Sensor usually takes care of the problem.

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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 P0038 2018 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P0038 on a 2018 Chevrolet Silverado?

- Common symptoms may include poor fuel economy, rough idling, engine misfires, and illuminated Check Engine Light.

2. What does the OBDII code P0038 "HO2S Heater Control Circuit High Voltage Bank 1 Sensor 2" mean on a 2018 Chevrolet Silverado?

- This code indicates that there is a high voltage condition in the heater control circuit of the downstream oxygen sensor in bank 1.

3. What are the possible causes of OBDII code P0038 on a 2018 Chevrolet Silverado?

- Possible causes include a faulty oxygen sensor, damaged wiring or connectors, a blown fuse, or a problem with the engine control module (ECM).

4. How can I diagnose the OBDII code P0038 on my 2018 Chevrolet Silverado?

- Diagnosis typically involves checking the oxygen sensor's wiring and connectors for damage, testing the sensor's heater circuit resistance, and inspecting the fuse related to the sensor.

5. Can I continue driving my 2018 Chevrolet Silverado with OBDII code P0038 present?

- It is generally not recommended to drive with this code active, as it can lead to poor engine performance and potential damage if left unresolved.

6. How can I repair OBDII code P0038 on a 2018 Chevrolet Silverado?

- Repair may involve replacing the downstream oxygen sensor in bank 1, repairing or replacing damaged wiring or connectors, and resetting the fault code with a diagnostic scanner.

7. Are there any DIY tips for fixing OBDII code P0038 on a 2018 Chevrolet Silverado?

- DIY tips include checking the oxygen sensor's connections, inspecting the sensor's wiring for damage, and ensuring the fuse related to the sensor is intact.

8. How much does it typically cost to repair OBDII code P0038 on a 2018 Chevrolet Silverado?

- The cost of repair can vary depending on the exact cause of the issue, but it may range from around $100 to $300 for parts and labor.

9. What happens if I ignore OBDII code P0038 on my 2018 Chevrolet Silverado?

- Ignoring this code can lead to decreased fuel efficiency, potential engine damage, and difficulties passing emissions tests.

10. Is OBDII code P0038 a common issue in 2018 Chevrolet Silverado vehicles?

- While not extremely common, issues related to oxygen sensor heater circuits can occur in various vehicles, including the 2018 Chevrolet Silverado.

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