AutoCodes – Saturn – P0037 Saturn

P0037 Saturn 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 Saturn 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 18,514

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

What does this mean?

What are the Possible Causes of the DTC P0037 Saturn?

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 Saturn?

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 Saturn 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 Saturn Code

1. What are the common symptoms of OBDII code P0037 in a Saturn?

- Common symptoms include loss of fuel efficiency, rough idle, poor engine performance, and the illumination of the Check Engine Light.

2. What does the OBDII code P0037 Saturn indicate?

- The code P0037 indicates a malfunction in the HO2S (Heated Oxygen Sensor) heater control circuit on Bank 1 Sensor 2 in a Saturn vehicle.

3. What are the potential causes of the HO2S heater control circuit low voltage fault in a Saturn?

- Possible causes include a faulty oxygen sensor, damaged wiring or connectors, a blown fuse, or issues with the vehicle's ECM (Engine Control Module).

4. How can I diagnose the OBDII code P0037 in my Saturn?

- Diagnosing the code typically involves checking the oxygen sensor's wiring and connectors for damage, testing the sensor's heater circuit, and inspecting related fuses.

5. Can I drive my Saturn with the OBDII code P0037?

- It is not recommended to drive the vehicle extensively with this code active, as it can lead to decreased fuel efficiency and potential engine performance issues.

6. How can I repair the HO2S heater control circuit low voltage fault in my Saturn?

- Repair options may include replacing the oxygen sensor, repairing damaged wiring or connectors, checking and replacing fuses if necessary, and clearing the fault code.

7. Will resetting the Check Engine Light resolve the P0037 code in my Saturn?

- Simply clearing the Check Engine Light without addressing the underlying issue will not fix the problem. The root cause of the fault needs to be diagnosed and repaired.

8. Can a DIY enthusiast fix the OBDII code P0037 in a Saturn?

- Depending on their skill level and access to tools, a DIY enthusiast may be able to address this code by following proper diagnostic procedures and making the necessary repairs.

9. How much does it cost to repair the HO2S heater control circuit low voltage fault in a Saturn?

- The cost of repair can vary depending on the specific cause of the fault, the need for parts replacement, and whether the repair is done at a dealership or by an independent mechanic.

10. Is it important to address the P0037 code promptly in a Saturn?

- It is advisable to address the code promptly to prevent potential damage to the vehicle's catalytic converter and ensure optimal engine performance and fuel efficiency.