AutoCodes – GMC – P0037 2018 GMC Sierra

P0037 2018 GMC Sierra Code - HO2S Heater Control Circuit Low Voltage Bank 1 Sensor 2

Quick Answer

Heated Oxygen Sensors (HO2S) are used for fuel control and post catalyst monitoring. Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2, Heated Oxygen Sensor Bank 1 Sensor 2 harness is open shorted to ground, Heated Oxygen Sensor Bank 1 Sensor 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: P0037 2018 GMC Sierra indicates HO2S Heater Control Circuit Low Voltage Bank 1 Sensor 2.
Common causes: Common causes include Faulty Heated Oxygen Sensor (H2OS) Bank 1 Sensor 2, Heated Oxygen Sensor Bank 1 Sensor 2 harness is open shorted to ground, Heated Oxygen Sensor Bank 1 Sensor 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 261

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 Mar 25, 2024

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P0037 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 a short to ground in the heater output low side driver circuit of the heated oxygen sensor when the heater is commanded OFF for greater than 5 s.

OBDII Code P0037 2018 GMC Sierra - HO2S Heater Control Circuit Low Voltage Bank 1 Sensor 2 - AutoCodes.com — P0037 2018 GMC Sierra Code - HO2S Heater Control Circuit Low Voltage Bank 1 Sensor 2

What does this mean?

What are the Possible Causes of the DTC P0037 2018 GMC Sierra?

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

How to Fix the DTC P0037 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 P0037 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 P0037 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code P0037 in a 2018 GMC Sierra?

- Common symptoms include decreased fuel efficiency, rough idling, and the illumination of the check engine light.

2. What does the OBDII code P0037, "HO2S Heater Control Circuit Low Voltage Bank 1 Sensor 2," indicate in a 2018 GMC Sierra?

- This code indicates that there is a low voltage condition in the heater control circuit of the oxygen sensor located after the catalytic converter on bank 1.

3. What are the possible causes of OBDII code P0037 in a 2018 GMC Sierra?

- Possible causes include a faulty oxygen sensor, damaged wiring or connectors in the sensor circuit, a blown fuse, or issues with the engine control module.

4. How can I diagnose the OBDII code P0037 in my 2018 GMC Sierra?

- To diagnose this code, you can use an OBDII scanner to retrieve the code, visually inspect the sensor and its wiring for damage, check the fuse related to the sensor heater circuit, and perform electrical tests on the sensor and related components.

5. Can I continue driving my 2018 GMC Sierra with OBDII code P0037?

- It is not recommended to continue driving with this code as it can impact your vehicle's performance and emissions. It's best to address the underlying issue promptly.

6. How can I repair OBDII code P0037 in a 2018 GMC Sierra?

- Repair options include replacing the oxygen sensor, repairing or replacing damaged wiring or connectors, checking and replacing fuses if necessary, and resetting the fault code with an OBDII scanner.

7. Is it possible to clear OBDII code P0037 in a 2018 GMC Sierra without fixing the underlying issue?

- While you can clear the code temporarily, the check engine light will likely reappear if the root cause is not addressed. It's recommended to fix the issue to prevent further problems.

8. Will OBDII code P0037 cause my 2018 GMC Sierra to fail an emissions test?

- Yes, OBDII code P0037 can cause your vehicle to fail an emissions test due to its impact on the oxygen sensor's performance and the vehicle's emissions control system.

9. How much does it typically cost to repair OBDII code P0037 in a 2018 GMC Sierra?

- The cost of repair can vary depending on the root cause of the issue, but it generally ranges from around $150 to $400, including parts and labor.

10. How often does OBDII code P0037 occur in a 2018 GMC Sierra?

- The occurrence of this code can vary depending on driving conditions and maintenance history, but it is not an extremely common issue in a 2018 GMC Sierra.