AutoCodes – GMC – P0158 2014 GMC Sierra

P0158 2014 GMC Sierra 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 2014 GMC Sierra 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.

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Code Popularity 296

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 27, 2022

Description
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code P0158 2014 GMC Sierra Description

The Heated Oxygen Sensors (HO2S) are used for fuel control and catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content of the exhaust stream. When the engine is started, the Engine Control Module (ECM) operates in an Open Loop mode, ignoring the HO2S signal voltage while calculating the air-to-fuel ratio. While the engine runs, the HO2S heats up and begins to generate a voltage within a range of 0 - 1, 000 mV. Once sufficient HO2S voltage fluctuation is observed by the ECM, Closed Loop is entered. The ECM uses the HO2S voltage to determine the air-to-fuel ratio. An HO2S voltage that increases toward 1, 000 mV indicates a rich fuel mixture. An HO2S voltage that decreases toward 0 mV indicates a lean fuel mixture.
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.

OBDII Code P0158 2014 GMC Sierra - HO2S Circuit High Voltage Bank 2 Sensor 2 - AutoCodes.com — P0158 2014 GMC Sierra Code - HO2S Circuit High Voltage Bank 2 Sensor 2

What does this mean?

What are the Possible Causes of the DTC P0158 2014 GMC Sierra?

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 2014 GMC Sierra?

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.

What does this mean?

Code Tech Notes

Replacing the Rear Heated Oxygen Sensor (HO2S) Bank 2 usually takes care of the problem.

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0158 2014 GMC Sierra 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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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0158 2014 GMC Sierra Code

What does OBDII code P0158 mean on a 2014 GMC Sierra?

Code P0158 indicates that the Bank 2 Sensor 2 (downstream oxygen sensor) is reporting a high voltage, suggesting excessive oxygen levels in the exhaust.

What are common symptoms of code P0158 on a 2014 GMC Sierra?

Symptoms may include a check engine light, reduced fuel efficiency, rough idling, or increased emissions.

What causes code P0158 on a 2014 GMC Sierra?

Common causes include a faulty oxygen sensor, damaged wiring or connectors, exhaust leaks, or a malfunctioning catalytic converter.

Can a bad oxygen sensor cause P0158 on a 2014 GMC Sierra?

Yes, a failing downstream oxygen sensor can cause the circuit to report high voltage, leading to this code.

How do you diagnose P0158 on a 2014 GMC Sierra?

Start by inspecting the oxygen sensor, wiring, and connectors for damage. Use a multimeter to test sensor voltage and compare it to manufacturer specifications.

Is it safe to drive a 2014 GMC Sierra with code P0158?

While it may be safe to drive short distances, prolonged driving can lead to increased emissions, reduced fuel economy, and potential engine damage.

How do you fix code P0158 on a 2014 GMC Sierra?

Repairs include replacing the oxygen sensor, repairing damaged wiring, checking for exhaust leaks, and inspecting the catalytic converter.

Can a clogged catalytic converter cause P0158 on a 2014 GMC Sierra?

Yes, a malfunctioning or clogged catalytic converter can affect exhaust flow and cause high voltage readings in the downstream sensor.

Does P0158 affect fuel efficiency on a 2014 GMC Sierra?

Yes, this code can lead to reduced fuel efficiency due to improper air-fuel mixture adjustments by the engine control module.

How much does it cost to repair code P0158 on a 2014 GMC Sierra?

Repair costs vary, but replacing an oxygen sensor typically ranges from $150 to $300, while wiring repairs or catalytic converter replacement may cost more.