P0138 2017 Chevrolet Silverado Code - HO2S Circuit High Voltage Bank 1 Sensor 2
Quick Answer
The P0138 diagnostic trouble code (DTC) for a 2017 Chevrolet Silverado refers to a high voltage condition in the HO2S (Heated Oxygen Sensor) circuit for Bank 1 Sensor 2. Common causes include Faulty HO2S (Bank 1 Sensor 2), Wiring issues such as shorts or open circuits, 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 2017 Chevrolet Silverado indicates HO2S Circuit High Voltage Bank 1 Sensor 2.
- Common causes
- Common causes include Faulty HO2S (Bank 1 Sensor 2), Wiring issues such as shorts or open circuits, 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 2017 Chevrolet Silverado Description
The P0138 diagnostic trouble code (DTC) for a 2017 Chevrolet Silverado refers to a high voltage condition in the HO2S (Heated Oxygen Sensor) circuit for Bank 1 Sensor 2. The HO2S is responsible for monitoring the oxygen content in the exhaust gases and providing feedback to the engine control module (ECM) to adjust the air-fuel mixture for optimal combustion. Bank 1 Sensor 2 specifically measures the oxygen levels downstream of the catalytic converter.
Common Causes of P0138 2017 Chevrolet Silverado
- Faulty HO2S (Bank 1 Sensor 2)
- Wiring issues such as shorts or open circuits
- Exhaust leaks near the sensor
- Engine running too rich
- ECM software or hardware issues
Symptoms of P0138 2017 Chevrolet Silverado
- Decreased fuel efficiency
- Rough idling or stalling
- Check Engine Light illuminated
- Poor acceleration or power loss
- Increased emissions
How to Fix P0138 2017 Chevrolet Silverado
- Diagnose the code using a scan tool to confirm the high voltage condition in the HO2S circuit.
- Inspect the wiring harness for any visible damage or corrosion, and repair or replace as necessary.
- Check for exhaust leaks near the sensor and repair any leaks found.
- Test the HO2S (Bank 1 Sensor 2) using a multimeter to verify its functionality, and replace it if faulty.
- Clear the DTC and test drive the vehicle to ensure the repair was successful.
Cost to Fix P0138 2017 Chevrolet Silverado
The typical repair costs for addressing a P0138 code on a 2017 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 is advisable to consult with a trusted auto repair shop for a more accurate estimate based on your vehicle's make and model, as well as the severity of the problem. Keep in mind that labor rates can vary widely, so it's essential to research local rates to determine the total cost of the repair.
Tech Notes for P0138 2017 Chevrolet Silverado
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Frequently Asked Questions about P0138 2017 Chevrolet Silverado Code
1. What does the OBDII code P0138 mean on a 2017 Chevrolet Silverado?
P0138 indicates that the downstream oxygen sensor (Bank 1, Sensor 2) is reporting excessively high voltage, suggesting an issue in the sensor or exhaust system.
2. What are the symptoms of code P0138 on a 2017 Chevrolet Silverado?
Common symptoms include poor fuel efficiency, rough idling, engine hesitation, and the check engine light illuminating.
3. What causes P0138 on a 2017 Chevrolet Silverado?
Possible causes include a faulty downstream oxygen sensor, damaged sensor wiring, exhaust leaks, or an overly rich air-fuel mixture.
4. Can a dirty air filter cause code P0138 on my 2017 Chevrolet Silverado?
While unlikely, a clogged air filter might indirectly affect the air-fuel ratio, potentially contributing to the issue.
5. How do I fix code P0138 on my 2017 Chevrolet Silverado?
Start by inspecting and, if necessary, replacing the downstream oxygen sensor (Bank 1, Sensor 2). Check for wiring damage or exhaust system leaks.
6. Can I drive my 2017 Chevrolet Silverado with code P0138?
Driving with P0138 is possible but not recommended, as it can lead to reduced fuel efficiency and potentially damage the catalytic converter.
7. How much does it cost to repair code P0138 on a 2017 Chevrolet Silverado?
Repair costs can range from $150 to $400, depending on whether you replace the oxygen sensor or need additional repairs.
8. Do I need to replace the catalytic converter for code P0138?
Not typically. P0138 usually involves issues with the oxygen sensor or wiring, but prolonged driving with this code may damage the catalytic converter.
9. How do I diagnose the cause of code P0138 on a 2017 Chevrolet Silverado?
Use a multimeter to check the oxygen sensor voltage, inspect wiring for damage, and verify the air-fuel mixture with a scan tool.
10. Does a software update fix code P0138 on a 2017 Chevrolet Silverado?
A software update is unlikely to resolve this specific code, as it typically involves physical sensor or wiring issues.
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