AutoCodes – GMC – P0037 2015 GMC Sierra

P0037 2015 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 2015 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 379

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 2015 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 2015 GMC Sierra - HO2S Heater Control Circuit Low Voltage Bank 1 Sensor 2 - AutoCodes.com — P0037 2015 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 2015 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 2015 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 2015 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 2015 GMC Sierra Code

1. What are the common symptoms of OBDII code P0037 on a 2015 GMC Sierra?

- Common symptoms include reduced fuel efficiency, rough idling, poor engine performance, and an illuminated Check Engine light.

2. What does the OBDII code P0037 "HO2S Heater Control Circuit Low Voltage Bank 1 Sensor 2" mean for a 2015 GMC Sierra?

- This code indicates that there is a low voltage condition in the oxygen sensor heater control circuit of the downstream (post-catalytic converter) oxygen sensor in bank 1 of the engine.

3. What are the possible causes of OBDII code P0037 on a 2015 GMC Sierra?

- Potential causes include a faulty oxygen sensor, damaged wiring or connectors in the sensor circuit, a blown fuse, or an issue with the engine control module (ECM).

4. How can I diagnose and repair OBDII code P0037 on a 2015 GMC Sierra?

- Diagnosis involves checking the oxygen sensor's heater circuit resistance, inspecting the sensor wiring and connectors for damage, testing the fuse, and scanning the ECM for related error codes. Repairs may involve replacing the oxygen sensor, repairing wiring, or addressing ECM issues.

5. Can driving with OBDII code P0037 on a 2015 GMC Sierra cause further damage?

- Continued driving with this code may lead to increased emissions, reduced fuel efficiency, and potential damage to the catalytic converter over time. It is recommended to address the issue promptly.

6. Is it safe to reset the Check Engine light after fixing OBDII code P0037 on a 2015 GMC Sierra?

- Yes, once the underlying issue causing the code has been resolved, you can safely clear the code and reset the Check Engine light using an OBDII scanner.

7. How much does it typically cost to repair OBDII code P0037 on a 2015 GMC Sierra?

- The cost of repairs can vary depending on the exact cause of the issue, but it may range from $100 to $300 for parts and labor if replacing the oxygen sensor is required.

8. Can a DIY enthusiast fix OBDII code P0037 on a 2015 GMC Sierra?

- Depending on the individual's skill level and access to tools, a DIY enthusiast may be able to diagnose and replace the oxygen sensor or address wiring issues associated with this code. However, caution and proper research are recommended.

9. How long does it typically take to repair OBDII code P0037 on a 2015 GMC Sierra?

- The repair time can vary based on the specific cause of the issue and the individual performing the repairs. In general, it may take around 1-2 hours for a straightforward sensor replacement or wiring repair.

10. Will OBDII code P0037 on a 2015 GMC Sierra cause the vehicle to fail an emissions test?

- Yes, this code can cause the vehicle to fail an emissions test due to increased emissions resulting from improper oxygen sensor operation. It is recommended to address the issue before attempting an emissions test.