AutoCodes – GMC – P0152 2018 GMC Sierra

P0152 2018 GMC Sierra Code - HO2S Circuit High Voltage Bank 2 Sensor 1

Quick Answer

The Heated Oxygen Sensors (HO2S) are used for fuel control and catalyst monitoring. Common causes include Faulty Front Heated Oxygen Sensor Bank 2, Front Heated Oxygen Sensor Bank 2 harness is open or shorted, Front 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: P0152 2018 GMC Sierra indicates HO2S Circuit High Voltage Bank 2 Sensor 1.
Common causes: Common causes include Faulty Front Heated Oxygen Sensor Bank 2, Front Heated Oxygen Sensor Bank 2 harness is open or shorted, Front 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 191

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 P0152 2018 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 P0152 2018 GMC Sierra - HO2S Circuit High Voltage Bank 2 Sensor 1 - AutoCodes.com — P0152 2018 GMC Sierra Code - HO2S Circuit High Voltage Bank 2 Sensor 1

What does this mean?

What are the Possible Causes of the DTC P0152 2018 GMC Sierra?

Faulty Front Heated Oxygen Sensor Bank 2
Front Heated Oxygen Sensor Bank 2 harness is open or shorted
Front 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 P0152 2018 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 Front Heated Oxygen Sensor (HO2S) Bank 2 usually takes care of the problem.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0152 2018 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 P0152 2018 GMC Sierra Code

What does the OBDII code P0152 mean on a 2018 GMC Sierra?

P0152 indicates that the oxygen sensor (HO2S) in Bank 2 Sensor 1 is reporting a consistently high voltage, suggesting a rich air-fuel mixture.

What are the symptoms of code P0152 in a 2018 GMC Sierra?

Common symptoms include poor fuel economy, rough idling, engine hesitation, black smoke from the exhaust, and the Check Engine Light being illuminated.

What causes the P0152 code to appear on a 2018 GMC Sierra?

Possible causes include a faulty oxygen sensor, a short in the sensor wiring, a rich-running engine due to issues like a leaking fuel injector, or a malfunctioning mass airflow (MAF) sensor.

Can I drive my 2018 GMC Sierra with the P0152 code?

While the truck may still run, driving with this code can lead to reduced performance and potential long-term damage to the catalytic converter if not addressed promptly.

How do I diagnose the P0152 code on a 2018 GMC Sierra?

Start by inspecting the oxygen sensor and its wiring for damage. Use a scan tool to check live data from the sensor and compare it to expected voltage ranges. Further testing may involve examining the fuel system and MAF sensor.

How do I fix the P0152 code on a 2018 GMC Sierra?

Repairs may include replacing the faulty oxygen sensor, repairing damaged wiring or connectors, cleaning or replacing the MAF sensor, or addressing fuel system issues like a leaking injector.

What tools are needed to diagnose and fix the P0152 code?

Basic tools include an OBDII scan tool, a multimeter for checking wiring, and potentially a fuel pressure gauge if fuel system issues are suspected.

How much does it cost to fix the P0152 code on a 2018 GMC Sierra?

The cost depends on the root cause. Replacing an oxygen sensor typically ranges from $150 to $400, while more complex repairs like fuel system fixes may cost more.

Can a dirty air filter cause the P0152 code?

While unlikely, a dirty air filter can contribute to a rich air-fuel mixture, which may indirectly trigger the code. It’s a good idea to check and replace the air filter if needed.

How can I prevent the P0152 code from recurring on my 2018 GMC Sierra?

Regular maintenance, such as inspecting the oxygen sensors, checking for vacuum leaks, and keeping the fuel system and MAF sensor clean, can help prevent this code.