P0158 GMC Code - HO2S Circuit High Voltage Bank 2 Sensor 2
Quick Answer
The P0158 GMC code refers to a problem with the HO2S (Heated Oxygen Sensor) circuit on Bank 2 Sensor 2 in the vehicle's exhaust system. Common causes include Malfunctioning HO2S (Heated Oxygen Sensor), Wiring or connector issues in the sensor circuit, Exhaust leaks. 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
- P0158 GMC indicates HO2S Circuit High Voltage Bank 2 Sensor 2.
- Common causes
- Common causes include Malfunctioning HO2S (Heated Oxygen Sensor), Wiring or connector issues in the sensor circuit, Exhaust leaks.
- 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.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code P0158 GMC Description
The P0158 GMC code refers to a problem with the HO2S (Heated Oxygen Sensor) circuit on Bank 2 Sensor 2 in the vehicle's exhaust system. This sensor is responsible for monitoring the oxygen levels in the exhaust gases to ensure the proper air-fuel ratio for combustion in the engine. When the sensor detects that the voltage is too high, it indicates that there is an issue with the sensor itself or the circuit connected to it.
Common Causes of P0158 GMC
- Malfunctioning HO2S (Heated Oxygen Sensor)
- Wiring or connector issues in the sensor circuit
- Exhaust leaks
- Vacuum leaks
- Fuel system problems
Symptoms of P0158 GMC
- Decreased fuel efficiency
- Rough idling or stalling
- Engine hesitation or misfires
- Increased emissions
- Check Engine Light illuminated on the dashboard
How to Fix P0158 GMC
- Begin by using an OBD-II scanner to confirm the P0158 code and ensure it is not a false alarm.
- Inspect the wiring and connectors in the HO2S circuit for any signs of damage or corrosion. Repair or replace any faulty components.
- Test the HO2S sensor itself to determine if it is functioning correctly. Replace the sensor if necessary.
- Clear the error codes with the OBD-II scanner and test drive the vehicle to ensure the issue has been resolved.
- If the problem persists, further diagnostic tests may be needed to pinpoint the exact cause of the high voltage reading.
Cost to Fix P0158 GMC
The typical repair costs for addressing a P0158 GMC code can vary depending on the specific cause of the issue and the labor rates in your area. On average, you can expect to pay anywhere from $150 to $300 for parts and labor. Keep in mind that rates at auto repair shops can fluctuate based on location, vehicle make and model, and the complexity of the repair. It's recommended to obtain quotes from multiple shops to find the best price for your particular situation.
Tech Notes for P0158 GMC
Need more information about the P0158 GMC code?
Need more information on how to fix the P0158 GMC code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P0158 GMC code diagnosed by a professional: Find a repair shop in your area
Information for Specific GMC Models
- P0158 2014 GMC Sierra — HO2S Circuit High Voltage Bank 2 Sensor 2
- P0158 2015 GMC Sierra — HO2S Circuit High Voltage Bank 2 Sensor 2
- P0158 2016 GMC Sierra — HO2S Circuit High Voltage Bank 2 Sensor 2
- P0158 2017 GMC Sierra — HO2S Circuit High Voltage Bank 2 Sensor 2
- P0158 2018 GMC Sierra — HO2S Circuit High Voltage Bank 2 Sensor 2
Frequently Asked Questions about P0158 GMC Code
1. What does the OBDII code P0158 mean on a GMC vehicle?
P0158 indicates that the oxygen sensor (Bank 2, Sensor 2) is detecting a high voltage, which typically means the sensor is reporting an excessively rich air-fuel mixture.
2. What are the common symptoms of the P0158 code on a GMC?
Symptoms may include poor fuel economy, rough idling, engine hesitation, and an illuminated Check Engine Light.
3. What causes the P0158 code to appear on a GMC?
Common causes include a faulty oxygen sensor, a shorted sensor wiring harness, exhaust leaks, or issues with the engine control module (ECM).
4. Can I drive my GMC with the P0158 code?
Driving with the P0158 code is not recommended as it can lead to poor performance, increased emissions, and potential damage to the catalytic converter.
5. How do I fix the P0158 code on my GMC?
Repairs may involve replacing the oxygen sensor, checking and repairing wiring or connectors, fixing exhaust leaks, or updating the ECM software if necessary.
6. How do I identify which part of the vehicle is Bank 2, Sensor 2?
Bank 2 refers to the side of the engine opposite Bank 1 (usually the side without cylinder 1), and Sensor 2 is the downstream oxygen sensor located after the catalytic converter.
7. How can I test the oxygen sensor for the P0158 code?
You can use a multimeter to check the sensor's voltage output or a scan tool to monitor live data for abnormal readings from Bank 2, Sensor 2.
8. Could a dirty or faulty mass airflow sensor cause the P0158 code?
Yes, a dirty or faulty mass airflow sensor could cause an incorrect air-fuel mixture, leading to issues that trigger the P0158 code.
9. How much does it cost to fix the P0158 code on a GMC?
Repair costs vary, but replacing an oxygen sensor typically ranges from $150 to $350, depending on parts and labor.
10. Can a vacuum leak trigger the P0158 code?
While vacuum leaks are less likely to cause this specific code, they can affect the air-fuel mixture and indirectly contribute to sensor issues.
Discuss the causes and fixes for P0158 GMC OBDII Code
Code P0158 GMC comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.