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Engine-Codes – GMC – P0059 2018 GMC Sierra

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

Quick Answer

The P0059 diagnostic trouble code (DTC) for a 2018 GMC Sierra specifically refers to an issue with the HO2S (Heated Oxygen Sensor) Heater Resistance in Bank 2 Sensor 1. Common causes include Faulty Oxygen Sensor: The most common cause of the P0059 code is a malfunctioning oxygen sensor in Bank 2 Sensor 1, Damaged Wiring or Connectors: Issues with the wiring or connectors in the sensor circuit can disrupt the heater element's operation, Blown Fuse: A blown fuse in the oxygen sensor circuit can prevent the heater element from receiving power. 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 Oxygen Sensor: The most common cause of the P0059 code is a malfunctioning oxygen sensor in Bank 2 Sensor 1, Damaged Wiring or Connectors: Issues with the wiring or connectors in the sensor circuit can disrupt the heater element's operation, Blown Fuse: A blown fuse in the oxygen sensor circuit can prevent the heater element from receiving power.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 12, 2024
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Code P0059 2018 GMC Sierra Description

The P0059 diagnostic trouble code (DTC) for a 2018 GMC Sierra specifically refers to an issue with the HO2S (Heated Oxygen Sensor) Heater Resistance in Bank 2 Sensor 1. This sensor is responsible for monitoring the oxygen levels in the exhaust gases and providing feedback to the engine control module (ECM) to adjust the air-fuel mixture for optimal combustion. The heater element in the sensor helps it reach operating temperature quickly, allowing it to function effectively.

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

Common Causes of P0059 2018 GMC Sierra

  1. Faulty Oxygen Sensor: The most common cause of the P0059 code is a malfunctioning oxygen sensor in Bank 2 Sensor 1.
  2. Damaged Wiring or Connectors: Issues with the wiring or connectors in the sensor circuit can disrupt the heater element's operation.
  3. Blown Fuse: A blown fuse in the oxygen sensor circuit can prevent the heater element from receiving power.
  4. ECM Malfunction: Problems with the engine control module (ECM) can also trigger the P0059 code by failing to provide the necessary signals to the oxygen sensor.

Symptoms of P0059 2018 GMC Sierra

  1. Check Engine Light: The most common symptom associated with the P0059 code is the illumination of the check engine light on the vehicle's dashboard.
  2. Decreased Fuel Efficiency: A malfunctioning oxygen sensor can lead to incorrect air-fuel mixture adjustments, resulting in decreased fuel efficiency.
  3. Rough Idling: The engine may experience rough idling or hesitation during acceleration due to inaccurate sensor readings.
  4. Failed Emissions Test: If the oxygen sensor is not functioning correctly, the vehicle may fail an emissions test due to increased emissions.
  5. Engine Misfires: In severe cases, the engine may experience misfires or rough running conditions as a result of the incorrect air-fuel mixture.

How to Fix P0059 2018 GMC Sierra

  1. Diagnose the Issue: Use an OBD-II scanner to retrieve the specific trouble code and perform a visual inspection of the oxygen sensor and its wiring.
  2. Test the Oxygen Sensor: Check the resistance of the heater element in Bank 2 Sensor 1 to determine if it is within the specified range.
  3. Replace the Oxygen Sensor: If the sensor is faulty, replace it with a new, OEM-equivalent part to ensure proper functionality.
  4. Repair Wiring or Connectors: If there are issues with the wiring or connectors, repair or replace them as needed to restore the circuit's integrity.
  5. Clear the Codes: After completing the repairs, clear the DTCs from the ECM's memory and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P0059 2018 GMC Sierra

The typical repair costs for addressing the P0059 code on a 2018 GMC Sierra can range from $150 to $400, depending on the specific cause of the issue and the cost of parts and labor. This estimate includes the price of a new oxygen sensor, any necessary wiring repairs, and the labor involved in diagnosing and fixing the problem. It's important to note that the actual cost may vary based on factors such as the location of the repair shop, the vehicle's make and model, and the technician's hourly labor rates. It is recommended to obtain quotes from multiple auto repair shops to ensure a competitive price for the repair.

What does this mean?

Tech Notes for P0059 2018 GMC Sierra

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.

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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.

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