P0138 2016 Chevrolet Silverado Code - HO2S Circuit High Voltage Bank 1 Sensor 2
Quick Answer
The P0138 diagnostic trouble code (DTC) for a 2016 Chevrolet Silverado indicates an issue with the HO2S (Heated Oxygen Sensor) Circuit High Voltage for Bank 1 Sensor 2. Common causes include Faulty HO2S: The sensor itself may be malfunctioning, providing incorrect voltage readings, Wiring or Connector Issues: Damaged wiring or poor connections can disrupt the signal between the sensor and the ECM, Exhaust Leaks: Leaks in the exhaust system before the sensor can introduce additional oxygen into the exhaust gases, affecting sensor readings. 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 2016 Chevrolet Silverado indicates HO2S Circuit High Voltage Bank 1 Sensor 2.
- Common causes
- Common causes include Faulty HO2S: The sensor itself may be malfunctioning, providing incorrect voltage readings, Wiring or Connector Issues: Damaged wiring or poor connections can disrupt the signal between the sensor and the ECM, Exhaust Leaks: Leaks in the exhaust system before the sensor can introduce additional oxygen into the exhaust gases, affecting sensor readings.
- 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 2016 Chevrolet Silverado Description
The P0138 diagnostic trouble code (DTC) for a 2016 Chevrolet Silverado indicates an issue with the HO2S (Heated Oxygen Sensor) Circuit High Voltage for Bank 1 Sensor 2. This sensor is responsible for monitoring the oxygen levels in the exhaust gases after they have passed through the catalytic converter. The data collected by this sensor is crucial for the engine control module (ECM) to adjust the air-fuel mixture for optimal combustion efficiency.
Common Causes of P0138 2016 Chevrolet Silverado
- Faulty HO2S: The sensor itself may be malfunctioning, providing incorrect voltage readings.
- Wiring or Connector Issues: Damaged wiring or poor connections can disrupt the signal between the sensor and the ECM.
- Exhaust Leaks: Leaks in the exhaust system before the sensor can introduce additional oxygen into the exhaust gases, affecting sensor readings.
- Malfunctioning ECM: A faulty ECM can misinterpret sensor data, leading to incorrect adjustments in the air-fuel mixture.
- Contaminated Sensor: Exposure to contaminants such as oil or coolant can affect the sensor's performance.
Symptoms of P0138 2016 Chevrolet Silverado
- Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the vehicle's dashboard.
- Decreased Fuel Efficiency: A high voltage reading from the HO2S can lead to a lean air-fuel mixture, resulting in decreased fuel efficiency.
- Rough Idle: The engine may experience rough idling or hesitation during acceleration due to incorrect air-fuel mixture.
- Increased Emissions: The vehicle may fail emissions tests due to the higher oxygen content in the exhaust gases.
- Reduced Engine Performance: The engine may lack power and responsiveness, affecting overall performance.
How to Fix P0138 2016 Chevrolet Silverado
- Diagnose the Issue: Use a scan tool to retrieve the DTC and perform further testing to pinpoint the exact cause of the high voltage reading.
- Inspect Wiring and Connections: Check the wiring harness and connectors for any damage or corrosion, repairing or replacing as needed.
- Test the HO2S: Test the HO2S in Bank 1 Sensor 2 to determine if it is providing accurate readings, replacing it if necessary.
- Clear DTC and Test Drive: Clear the DTC from the ECM memory, then test drive the vehicle to ensure the issue has been resolved.
- Monitor Sensor Performance: Keep an eye on the sensor's performance after the repair to ensure that the high voltage issue does not reoccur.
Cost to Fix P0138 2016 Chevrolet Silverado
The typical repair costs for addressing a P0138 DTC on a 2016 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. This estimate includes the cost of a new HO2S, wiring repairs, and diagnostic testing. Keep in mind that labor rates at auto repair shops can vary, so it's advisable to check with local shops for more accurate pricing.
Tech Notes for P0138 2016 Chevrolet Silverado
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Frequently Asked Questions about P0138 2016 Chevrolet Silverado Code
1. What does the P0138 code mean on a 2016 Chevrolet Silverado?
The P0138 code indicates that the HO2S (Heated Oxygen Sensor) for Bank 1 Sensor 2 is reporting a high voltage, which may suggest an issue with the oxygen sensor or the exhaust system.
2. What are the symptoms of the P0138 code on a 2016 Chevrolet Silverado?
Symptoms may include poor fuel economy, rough idling, excessive exhaust emissions, and the check engine light illuminating.
3. What causes the P0138 code on a 2016 Chevrolet Silverado?
Common causes include a faulty downstream oxygen sensor (Bank 1 Sensor 2), damaged wiring or connectors, exhaust leaks, or a malfunctioning catalytic converter.
4. How can I fix the P0138 code on my 2016 Chevrolet Silverado?
Repairs may involve replacing the Bank 1 Sensor 2 oxygen sensor, inspecting and repairing damaged wiring or connectors, or addressing any exhaust system issues.
5. Can I drive my 2016 Chevrolet Silverado with the P0138 code?
While the vehicle may remain operable, driving with this code can cause decreased fuel efficiency and potentially lead to damage to the catalytic converter over time.
6. How do I locate Bank 1 Sensor 2 on a 2016 Chevrolet Silverado?
Bank 1 Sensor 2 is the downstream oxygen sensor located after the catalytic converter on the side of the engine with cylinder 1.
7. Will the P0138 code cause my 2016 Chevrolet Silverado to fail an emissions test?
Yes, the P0138 code can result in your vehicle failing an emissions test due to improper exhaust gas monitoring.
8. How much does it cost to fix the P0138 code on a 2016 Chevrolet Silverado?
Repair costs can vary but typically range from $150 to $300 for parts and labor, depending on whether the oxygen sensor needs replacement or wiring repairs are required.
9. Can a dirty air filter cause the P0138 code on a 2016 Chevrolet Silverado?
A dirty air filter is unlikely to cause the P0138 code directly, but it can affect overall engine performance, which may contribute to related issues.
10. How do I clear the P0138 code on my 2016 Chevrolet Silverado?
The code can be cleared using an OBDII scanner after repairs, but it will return if the underlying issue isn’t resolved.
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