AutoCodes – GMC – P0059 2018 GMC Sierra

P0059 2018 GMC Sierra Code - HO2S Heater Resistance Bank 2 Sensor 1

Quick Answer

Heated Oxygen Sensors (HO2S) are used for fuel control and post catalyst monitoring. Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1, Heated Oxygen Sensor Bank 2 Sensor 1 harness is open shorted, Heated Oxygen Sensor Bank 2 Sensor 1 circuit poor electrical connection. 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: P0059 2018 GMC Sierra indicates HO2S Heater Resistance Bank 2 Sensor 1.
Common causes: Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1, Heated Oxygen Sensor Bank 2 Sensor 1 harness is open shorted, Heated Oxygen Sensor Bank 2 Sensor 1 circuit poor electrical connection.
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 Popularity 254

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 25, 2024

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0059 2018 GMC Sierra Description

Heated Oxygen Sensors (HO2S) are used for fuel control and post catalyst monitoring. Each HO2S compares the oxygen content of the surrounding air with the oxygen content in the exhaust stream. The HO2S must reach an operating temperature to provide an accurate voltage signal. A heating element inside the HO2S minimizes the time required for the sensors to reach operating temperature. Voltage is provided to the heater by an ignition voltage circuit through a fuse. With the engine running, the ground is provided to the heater by the HO2S heater low control circuit through a low side driver within the Engine Control Module (ECM). The ECM uses Pulse Width Modulation (PWM) to control the HO2S heater operation to maintain a specific HO2S operating temperature range.
The Diagnostic Trouble Code (DTC) will be set when the ECM detects the HO2S heater is not within a specified resistance range at engine start-up.

OBDII Code P0059 2018 GMC Sierra - HO2S Heater Resistance Bank 2 Sensor 1 - AutoCodes.com — P0059 2018 GMC Sierra Code - HO2S Heater Resistance Bank 2 Sensor 1

What does this mean?

What are the Possible Causes of the DTC P0059 2018 GMC Sierra?

Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1
Heated Oxygen Sensor Bank 2 Sensor 1 harness is open shorted
Heated Oxygen Sensor Bank 2 Sensor 1 circuit poor electrical connection
Heated Oxygen Sensor Bank 2 Sensor 1 circuit fuse
Faulty Engine Control Module (ECM)

How to Fix the DTC P0059 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

The code means that there is a problem with the heater element circuit of the heated oxygen sensor. The control module monitors how long it takes the sensor to warm up and start sending an adequate signal. The code is set when the sensor is taking too long to warm up. Water getting inside the heated oxygen sensor connector can cause the heated oxygen sensor fuse to blow. Before replacing the sensor, check for the condition of the heated oxygen sensor fuse and connectors. If the fuse and connector are OK, replacing the O2 Sensor usually takes care of the problem.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0059 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 P0059 2018 GMC Sierra Code

1. What does OBDII code P0059 for a 2018 GMC Sierra mean?

The code P0059 indicates an issue with the HO2S (Heated Oxygen Sensor) heater resistance for Bank 2 Sensor 1 in a 2018 GMC Sierra.

2. What are the common symptoms of OBDII code P0059 in a 2018 GMC Sierra?

Common symptoms of code P0059 may include poor fuel economy, rough idling, engine misfires, and the illumination of the check engine light on the dashboard.

3. What are the possible causes of OBDII code P0059 in a 2018 GMC Sierra?

Potential causes of code P0059 can include a faulty HO2S heater, damaged wiring or connectors related to the sensor, a blown fuse, or issues with the vehicle's ECM (Engine Control Module).

4. How do you diagnose OBDII code P0059 in a 2018 GMC Sierra?

Diagnosing code P0059 typically involves using an OBDII scanner to retrieve the specific fault code, inspecting the wiring and connectors for any damage, testing the HO2S heater resistance, and checking the fuse related to the sensor.

5. What is the repair process for OBDII code P0059 in a 2018 GMC Sierra?

To repair code P0059, you may need to replace the faulty HO2S sensor, repair or replace any damaged wiring or connectors, check and replace the fuse if necessary, and clear the fault code using an OBDII scanner.

6. Can I continue driving my 2018 GMC Sierra with OBDII code P0059?

It is not recommended to continue driving your vehicle with an unresolved OBDII code like P0059, as it can lead to decreased fuel efficiency, engine performance issues, and potential damage to other components over time.

7. How much does it cost to repair OBDII code P0059 in a 2018 GMC Sierra?

The cost of repairing code P0059 can vary depending on the extent of the issue, the cost of parts needed for replacement, and labor charges. It is advisable to consult a mechanic for an accurate estimate.

8. Can I fix OBDII code P0059 in a 2018 GMC Sierra myself?

If you have the necessary tools, knowledge, and experience, you may be able to address code P0059 yourself by following repair guides or service manuals specific to your vehicle. However, it is recommended to seek professional help if you are unsure.

9. How often does OBDII code P0059 occur in a 2018 GMC Sierra?

The occurrence of code P0059 in a 2018 GMC Sierra can vary depending on factors such as vehicle usage, maintenance history, and driving conditions. Regular maintenance and prompt attention to warning lights can help prevent such issues.

10. Will resetting the check engine light resolve OBDII code P0059 in a 2018 GMC Sierra?

Simply resetting the check engine light without addressing the underlying issue causing code P0059 will not resolve the problem. It is essential to diagnose the root cause of the code and perform the necessary repairs to prevent its recurrence.