P0158 GMC Code - HO2S Circuit High Voltage Bank 2 Sensor 2
Quick Answer
The Heated Oxygen Sensors (HO2S) are used for fuel control and catalyst monitoring. Common causes include Faulty Rear Heated Oxygen Sensor Bank 2, Rear Heated Oxygen Sensor Bank 2 harness is open or shorted, Rear Heated Oxygen Sensor Bank 2 circuit poor electrical connection. 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 Faulty Rear Heated Oxygen Sensor Bank 2, Rear Heated Oxygen Sensor Bank 2 harness is open or shorted, Rear Heated Oxygen Sensor Bank 2 circuit poor electrical connection.
- 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.
Code P0158 GMC Description
The heating elements inside each HO2S heat the sensor to bring the sensor up to operating conditions faster. This allows the system to enter Closed Loop earlier and the ECM to calculate the air-to-fuel ratio sooner.
The Diagnostic Trouble Code (DTC) will be set when the ECM detects that the HO2S voltage is greater than 1, 050 mV.
What are the Possible Causes of the DTC P0158 GMC?
- Faulty Rear Heated Oxygen Sensor Bank 2
- Rear Heated Oxygen Sensor Bank 2 harness is open or shorted
- Rear Heated Oxygen Sensor Bank 2 circuit poor electrical connection
- Low or high fuel system pressure
- Fuel contamination
- Faulty fuel injectors
- Exhaust gas leaks
- Engine vacuum leaks
How to Fix the DTC P0158 GMC?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0158 GMC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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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
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