P0138 2018 Chevrolet Silverado Code - HO2S Circuit High Voltage Bank 1 Sensor 2
Quick Answer
The P0138 diagnostic trouble code (DTC) for a 2018 Chevrolet Silverado refers to a fault in the HO2S (Heated Oxygen Sensor) circuit for Bank 1 Sensor 2. Common causes include Faulty HO2S sensor, Wiring issues or shorts in the HO2S circuit, Exhaust leaks near the sensor. 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
- P0138 2018 Chevrolet Silverado indicates HO2S Circuit High Voltage Bank 1 Sensor 2.
- Common causes
- Common causes include Faulty HO2S sensor, Wiring issues or shorts in the HO2S circuit, Exhaust leaks near the sensor.
- 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.
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Code P0138 2018 Chevrolet Silverado Description
The P0138 diagnostic trouble code (DTC) for a 2018 Chevrolet Silverado refers to a fault in the HO2S (Heated Oxygen Sensor) circuit for Bank 1 Sensor 2. This sensor is located downstream of the catalytic converter and is responsible for monitoring the oxygen levels in the exhaust gases. The code specifically indicates that the voltage signal from the sensor is reading higher than the expected range, which can lead to issues with the engine's fuel mixture and emissions control system.
Common Causes of P0138 2018 Chevrolet Silverado
- Faulty HO2S sensor
- Wiring issues or shorts in the HO2S circuit
- Exhaust leaks near the sensor
- ECM malfunction
- Fuel system problems affecting air-fuel ratio
Symptoms of P0138 2018 Chevrolet Silverado
- Decreased fuel efficiency
- Rough idling or stalling
- Check Engine Light illuminated
- Failed emissions test
- Reduced engine power
How to Fix P0138 2018 Chevrolet Silverado
- Use an OBD-II scanner to confirm the P0138 code and identify the specific sensor location.
- Inspect the wiring and connections for any damage or corrosion, repairing or replacing as needed.
- Test the HO2S sensor using a multimeter to check for proper voltage output.
- Check for exhaust leaks near the sensor and repair any leaks found.
- Clear the DTC and perform a test drive to ensure the issue has been resolved.
Cost to Fix P0138 2018 Chevrolet Silverado
The typical repair costs for addressing a P0138 code on a 2018 Chevrolet Silverado can range from $150 to $400, depending on the specific cause of the issue and the cost of parts and labor in your area. It's important to note that diagnostic time and labor rates at auto repair shops can vary, so it's recommended to obtain quotes from multiple sources for a more accurate estimate.
Tech Notes for P0138 2018 Chevrolet Silverado
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Frequently Asked Questions about P0138 2018 Chevrolet Silverado Code
1. What does OBDII code P0138 on a 2018 Chevrolet Silverado indicate?
- OBDII code P0138 in a 2018 Chevrolet Silverado refers to a fault in the HO2S (Heated Oxygen Sensor) circuit, specifically indicating high voltage in Bank 1 Sensor 2.
2. What are the common symptoms of OBDII code P0138 on a 2018 Chevrolet Silverado?
- Common symptoms of OBDII code P0138 include poor fuel economy, rough idling, engine hesitation, and potential issues with emissions.
3. What are the possible causes of OBDII code P0138 on a 2018 Chevrolet Silverado?
- The causes of OBDII code P0138 can include a faulty oxygen sensor, wiring issues in the sensor circuit, a vacuum leak, exhaust leaks, or a malfunctioning catalytic converter.
4. How do I diagnose the OBDII code P0138 on a 2018 Chevrolet Silverado?
- Diagnosing OBDII code P0138 involves using an OBDII scanner to retrieve the code, testing the oxygen sensor with a multimeter, and checking the sensor's wiring and connections for faults.
5. Can I drive my 2018 Chevrolet Silverado with OBDII code P0138?
- It's not recommended to drive your Chevrolet Silverado with OBDII code P0138 for an extended period, as it can lead to decreased fuel efficiency and potential damage to the catalytic converter.
6. How can I repair OBDII code P0138 on my 2018 Chevrolet Silverado?
- Repairing OBDII code P0138 may involve replacing the Bank 1 Sensor 2 oxygen sensor, repairing or replacing damaged wiring, fixing any vacuum or exhaust leaks, or addressing issues with the catalytic converter.
7. Is it possible to reset OBDII code P0138 on a 2018 Chevrolet Silverado without fixing the underlying issue?
- Resetting OBDII code P0138 without addressing the root cause will only clear the code temporarily. The issue causing the high voltage in the HO2S circuit needs to be fixed to prevent the code from reoccurring.
8. How much does it typically cost to repair OBDII code P0138 on a 2018 Chevrolet Silverado?
- The cost to repair OBDII code P0138 on a Chevrolet Silverado can vary depending on the exact cause of the issue, but it may range from $100 to $500 or more, including parts and labor.
9. Can a DIY enthusiast fix OBDII code P0138 on a 2018 Chevrolet Silverado?
- DIY enthusiasts with the necessary tools and knowledge of automotive repairs may be able to fix OBDII code P0138 by replacing the oxygen sensor or addressing wiring issues. However, professional diagnosis is recommended for accurate repairs.
10. How soon should I address OBDII code P0138 on my 2018 Chevrolet Silverado?
- It is advisable to address OBDII code P0138 on your Chevrolet Silverado as soon as possible to prevent potential damage to other components, ensure optimal engine performance, and maintain fuel efficiency.
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