P1138 GMC Code - HO2S Circuit High Voltage Sensor 2
Quick Answer
The P1138 GMC code refers to a potential issue with the HO2S (Heated Oxygen Sensor) Circuit High Voltage Sensor 2. Common causes include Faulty HO2S sensor, Damaged wiring or connectors, ECM malfunction. 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
- P1138 GMC indicates HO2S Circuit High Voltage Sensor 2.
- Common causes
- Common causes include Faulty HO2S sensor, Damaged wiring or connectors, ECM malfunction.
- 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 P1138 GMC Description
The P1138 GMC code refers to a potential issue with the HO2S (Heated Oxygen Sensor) Circuit High Voltage Sensor 2. This sensor is responsible for monitoring the oxygen levels in the exhaust gases and sending this information to the vehicle's engine control module (ECM) for proper air-fuel ratio adjustments. When the sensor detects a high voltage reading, it indicates that there may be an imbalance in the air-fuel mixture being delivered to the engine, which can lead to poor performance and increased emissions.
Common Causes of P1138 GMC
- Faulty HO2S sensor
- Damaged wiring or connectors
- ECM malfunction
- Exhaust leaks
- Fuel system issues
Symptoms of P1138 GMC
- Decreased fuel efficiency
- Engine misfires
- Rough idling
- Increased emissions
- Check Engine Light illuminated on the dashboard
How to Fix P1138 GMC
- Start by checking the wiring and connectors associated with the HO2S sensor for any signs of damage or corrosion. Repair or replace as necessary.
- Test the HO2S sensor using a multimeter to determine if it is functioning correctly. Replace the sensor if it is faulty.
- Clear the diagnostic trouble codes from the ECM using a scan tool and monitor the sensor readings to ensure the issue has been resolved.
- If the problem persists, further diagnostics may be required to pinpoint the exact cause, such as testing the ECM or checking for exhaust leaks.
- Once the root cause has been identified, proceed with the necessary repairs or replacements to address the issue effectively.
Cost to Fix P1138 GMC
The typical repair costs for addressing a P1138 GMC code can vary depending on the specific cause of the issue. In general, replacing a faulty HO2S sensor can cost between $100 and $200, while addressing wiring or connector problems may range from $50 to $150. If the ECM needs to be replaced, the cost can significantly increase, ranging from $500 to $1000 or more. Labor costs for these repairs can add up, with hourly rates typically ranging from $80 to $150. It's advisable to consult with a trusted auto repair shop for a more accurate estimate based on your vehicle make and model, as well as the extent of the issue.
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