AutoCodes – GMC – P0037 GMC

P0037 GMC 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 GMC 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 6,503

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

What does this mean?

What are the Possible Causes of the DTC P0037 GMC?

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 GMC?

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 GMC 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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Information for Specific GMC Models

P0037 2014 GMC Sierra — HO2S Heater Control Circuit Low Voltage Bank 1 Sensor 2
P0037 2015 GMC Sierra — HO2S Heater Control Circuit Low Voltage Bank 1 Sensor 2
P0037 2016 GMC Sierra — HO2S Heater Control Circuit Low Voltage Bank 1 Sensor 2
P0037 2017 GMC Sierra — HO2S Heater Control Circuit Low Voltage Bank 1 Sensor 2
P0037 2018 GMC Sierra — HO2S Heater Control Circuit Low Voltage Bank 1 Sensor 2

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 GMC Code

1. What does the OBDII code P0037 mean for a GMC vehicle?

P0037 indicates a problem with the heater control circuit for the oxygen sensor (Bank 1, Sensor 2), specifically that it is detecting low voltage.

2. What are common symptoms of the P0037 code in a GMC?

Symptoms may include an illuminated check engine light, poor fuel efficiency, or a failed emissions test, though the vehicle may still drive normally.

3. What causes the P0037 code in a GMC?

Common causes include a faulty oxygen sensor, damaged wiring or connectors, a blown fuse, or a malfunctioning powertrain control module (PCM).

4. Where is Bank 1 Sensor 2 located in a GMC?

Bank 1 Sensor 2 is located downstream of the catalytic converter on the side of the engine with cylinder 1.

5. Can a faulty oxygen sensor trigger the P0037 code?

Yes, a faulty oxygen sensor heater element is a common cause of the P0037 code.

6. How can I diagnose the P0037 code on my GMC?

Perform a visual inspection of the wiring and connectors, check for blown fuses, and use a multimeter to measure the resistance of the oxygen sensor heater circuit.

7. Can I drive my GMC with the P0037 code?

While the vehicle may remain drivable, prolonged operation with this code can lead to increased emissions and potential damage to the catalytic converter.

8. How do I fix the P0037 code on a GMC?

Common fixes include replacing the oxygen sensor, repairing damaged wiring, replacing blown fuses, or reprogramming the PCM if necessary.

9. How much does it cost to fix the P0037 code on a GMC?

Repair costs can vary, but replacing the oxygen sensor typically ranges from $100 to $300, depending on labor and parts.

10. Can a bad catalytic converter cause the P0037 code?

While rare, a bad catalytic converter can sometimes lead to issues with downstream oxygen sensor readings, but the code is more directly linked to the sensor or its circuitry.