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P0037 Chevrolet 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 Chevrolet 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 19,240
How popular is this code, among other codes? Low
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Table of contents Created and updated by William Orellana on Mar 23, 2024
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Code P0037 Chevrolet 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 Chevrolet - HO2S Heater Control Circuit Low Voltage Bank 1 Sensor 2 - AutoCodes.com
P0037 Chevrolet Code - HO2S Heater Control Circuit Low Voltage Bank 1 Sensor 2
What does this mean?

What are the Possible Causes of the DTC P0037 Chevrolet?

  • 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 Chevrolet?

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.





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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0037 Chevrolet 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 Chevrolet Models

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 Chevrolet Code

What does the OBDII code P0037 mean on a Chevrolet?

P0037 indicates a problem with the HO2S (Heated Oxygen Sensor) Heater Control Circuit Low Voltage for Bank 1 Sensor 2, which is the downstream oxygen sensor.

What are the symptoms of code P0037 on a Chevrolet?

Symptoms may include the check engine light turning on, reduced fuel efficiency, and failed emissions testing.

What causes the P0037 code on a Chevrolet?

Common causes include a faulty oxygen sensor heater, damaged wiring or connectors, a blown fuse, or an issue with the ECM (Engine Control Module).

How do I fix code P0037 on my Chevrolet?

Repairs may involve replacing the downstream oxygen sensor, repairing damaged wiring or connectors, or checking and replacing a blown fuse.

Can I drive my Chevrolet with code P0037?

Yes, but it’s not recommended for an extended period as it may lead to reduced fuel efficiency and other related issues.

How do I diagnose code P0037 on a Chevrolet?

Use an OBDII scanner to verify the code, inspect the oxygen sensor wiring and connectors for damage, and test the sensor’s heater circuit for proper function.

Which sensor is affected by code P0037 on a Chevrolet?

Bank 1 Sensor 2, which is the downstream oxygen sensor located after the catalytic converter.

What tools are needed to fix code P0037 on a Chevrolet?

An OBDII scanner, multimeter, and basic automotive tools are often required for diagnosis and repair.

How much does it cost to repair code P0037 on a Chevrolet?

Repair costs can range from $150 to $300, depending on whether the oxygen sensor or wiring needs replacement.

Can a bad oxygen sensor cause code P0037 on a Chevrolet?

Yes, a faulty oxygen sensor heater element is one of the most common causes of this code.

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